diff options
Diffstat (limited to 'fpga/usrp2/opencores/zpu')
| -rw-r--r-- | fpga/usrp2/opencores/zpu/core/zpu_config.vhd | 20 | ||||
| -rw-r--r-- | fpga/usrp2/opencores/zpu/core/zpu_core.vhd | 948 | ||||
| -rw-r--r-- | fpga/usrp2/opencores/zpu/core/zpupkg.vhd | 168 | ||||
| -rw-r--r-- | fpga/usrp2/opencores/zpu/wishbone/wishbone_pkg.vhd | 86 | ||||
| -rw-r--r-- | fpga/usrp2/opencores/zpu/wishbone/zpu_system.vhd | 105 | ||||
| -rw-r--r-- | fpga/usrp2/opencores/zpu/wishbone/zpu_wb_bridge.vhd | 83 | ||||
| -rw-r--r-- | fpga/usrp2/opencores/zpu/zpu_top_pkg.vhd | 46 | ||||
| -rw-r--r-- | fpga/usrp2/opencores/zpu/zpu_wb_top.vhd | 74 |
8 files changed, 1530 insertions, 0 deletions
diff --git a/fpga/usrp2/opencores/zpu/core/zpu_config.vhd b/fpga/usrp2/opencores/zpu/core/zpu_config.vhd new file mode 100644 index 000000000..560547223 --- /dev/null +++ b/fpga/usrp2/opencores/zpu/core/zpu_config.vhd @@ -0,0 +1,20 @@ +library ieee; +use ieee.std_logic_1164.all; +use ieee.std_logic_unsigned.all; + +package zpu_config is + -- generate trace output or not. + constant Generate_Trace : boolean := false; + constant wordPower : integer := 5; + -- during simulation, set this to '0' to get matching trace.txt + constant DontCareValue : std_logic := '0'; + -- Clock frequency in MHz. + constant ZPU_Frequency : std_logic_vector(7 downto 0) := x"40"; + -- This is the msb address bit. bytes=2^(maxAddrBitIncIO+1) + constant maxAddrBitIncIO : integer := 15; + + -- start byte address of stack. + -- point to top of RAM - 2*words + constant spStart : std_logic_vector(maxAddrBitIncIO downto 0) := x"3ff8"; + +end zpu_config; diff --git a/fpga/usrp2/opencores/zpu/core/zpu_core.vhd b/fpga/usrp2/opencores/zpu/core/zpu_core.vhd new file mode 100644 index 000000000..2450f14d3 --- /dev/null +++ b/fpga/usrp2/opencores/zpu/core/zpu_core.vhd @@ -0,0 +1,948 @@ + +-- Company: ZPU4 generic memory interface CPU +-- Engineer: Øyvind Harboe + +library IEEE; +use IEEE.STD_LOGIC_1164.ALL; +use IEEE.STD_LOGIC_UNSIGNED.ALL; +use IEEE.STD_LOGIC_arith.ALL; + +library work; +use work.zpu_config.all; +use work.zpupkg.all; + + + + + +entity zpu_core is + Port ( clk : in std_logic; + areset : in std_logic; + enable : in std_logic; + mem_req : out std_logic; + mem_we : out std_logic; + mem_ack : in std_logic; + mem_read : in std_logic_vector(wordSize-1 downto 0); + mem_write : out std_logic_vector(wordSize-1 downto 0); + out_mem_addr : out std_logic_vector(maxAddrBitIncIO downto 0); + mem_writeMask: out std_logic_vector(wordBytes-1 downto 0); + interrupt : in std_logic; + break : out std_logic; + zpu_status : out std_logic_vector(63 downto 0)); +end zpu_core; + +architecture behave of zpu_core is + +type InsnType is +( +State_AddTop, +State_Dup, +State_DupStackB, +State_Pop, +State_Popdown, +State_Add, +State_Or, +State_And, +State_Store, +State_AddSP, +State_Shift, +State_Nop, +State_Im, +State_LoadSP, +State_StoreSP, +State_Emulate, +State_Load, +State_PushPC, +State_PushSP, +State_PopPC, +State_PopPCRel, +State_Not, +State_Flip, +State_PopSP, +State_Neqbranch, +State_Eq, +State_Loadb, +State_Mult, +State_Lessthan, +State_Lessthanorequal, +State_Ulessthanorequal, +State_Ulessthan, +State_Pushspadd, +State_Call, +State_Callpcrel, +State_Sub, +State_Break, +State_Storeb, +State_Interrupt, +State_InsnFetch +); + +type StateType is +( +State_Idle, -- using first state first on the list out of paranoia +State_Load2, +State_Popped, +State_LoadSP2, +State_LoadSP3, +State_AddSP2, +State_Fetch, +State_Execute, +State_Decode, +State_Decode2, +State_Resync, + +State_StoreSP2, +State_Resync2, +State_Resync3, +State_Loadb2, +State_Storeb2, +State_Mult2, +State_Mult3, +State_Mult5, +State_Mult6, +State_Mult4, +State_BinaryOpResult +); + + +signal pc : std_logic_vector(maxAddrBitIncIO downto 0); +signal sp : std_logic_vector(maxAddrBitIncIO downto minAddrBit); +signal incSp : std_logic_vector(maxAddrBitIncIO downto minAddrBit); +signal incIncSp : std_logic_vector(maxAddrBitIncIO downto minAddrBit); +signal decSp : std_logic_vector(maxAddrBitIncIO downto minAddrBit); +signal stackA : std_logic_vector(wordSize-1 downto 0); +signal binaryOpResult : std_logic_vector(wordSize-1 downto 0); +signal multResult2 : std_logic_vector(wordSize-1 downto 0); +signal multResult3 : std_logic_vector(wordSize-1 downto 0); +signal multResult : std_logic_vector(wordSize-1 downto 0); +signal multA : std_logic_vector(wordSize-1 downto 0); +signal multB : std_logic_vector(wordSize-1 downto 0); +signal stackB : std_logic_vector(wordSize-1 downto 0); +signal idim_flag : std_logic; +signal busy : std_logic; +signal mem_readEnable : std_logic; +signal mem_addr : std_logic_vector(maxAddrBitIncIO downto minAddrBit); +signal mem_delayAddr : std_logic_vector(maxAddrBitIncIO downto minAddrBit); +signal mem_delayReadEnable : std_logic; +signal mem_busy : std_logic; +signal decodeWord : std_logic_vector(wordSize-1 downto 0); + + +signal state : StateType; +signal insn : InsnType; +type InsnArray is array(0 to wordBytes-1) of InsnType; +signal decodedOpcode : InsnArray; + +type OpcodeArray is array(0 to wordBytes-1) of std_logic_vector(7 downto 0); + +signal opcode : OpcodeArray; + + + + +signal begin_inst : std_logic; +signal trace_opcode : std_logic_vector(7 downto 0); +signal trace_pc : std_logic_vector(maxAddrBitIncIO downto 0); +signal trace_sp : std_logic_vector(maxAddrBitIncIO downto minAddrBit); +signal trace_topOfStack : std_logic_vector(wordSize-1 downto 0); +signal trace_topOfStackB : std_logic_vector(wordSize-1 downto 0); + +signal out_mem_req : std_logic; + +signal inInterrupt : std_logic; + +-- state machine. + +begin + + zpu_status(maxAddrBitIncIO downto 0) <= trace_pc; + zpu_status(31) <= '1'; + zpu_status(39 downto 32) <= trace_opcode; + zpu_status(40) <= '1' when (state = State_Idle) else '0'; + zpu_status(62) <= '1'; + + traceFileGenerate: + if Generate_Trace generate + trace_file: trace port map ( + clk => clk, + begin_inst => begin_inst, + pc => trace_pc, + opcode => trace_opcode, + sp => trace_sp, + memA => trace_topOfStack, + memB => trace_topOfStackB, + busy => busy, + intsp => (others => 'U') + ); + end generate; + + + -- the memory subsystem will tell us one cycle later whether or + -- not it is busy + out_mem_addr(maxAddrBitIncIO downto minAddrBit) <= mem_addr; + out_mem_addr(minAddrBit-1 downto 0) <= (others => '0'); + mem_req <= out_mem_req; + + incSp <= sp + 1; + incIncSp <= sp + 2; + decSp <= sp - 1; + + mem_busy <= out_mem_req and not mem_ack; -- '1' when the memory is busy + + opcodeControl: + process(clk, areset) + variable tOpcode : std_logic_vector(OpCode_Size-1 downto 0); + variable spOffset : std_logic_vector(4 downto 0); + variable tSpOffset : std_logic_vector(4 downto 0); + variable nextPC : std_logic_vector(maxAddrBitIncIO downto 0); + variable tNextState : InsnType; + variable tDecodedOpcode : InsnArray; + variable tMultResult : std_logic_vector(wordSize*2-1 downto 0); + begin + if areset = '1' then + state <= State_Idle; + break <= '0'; + sp <= spStart(maxAddrBitIncIO downto minAddrBit); + + pc <= (others => '0'); + idim_flag <= '0'; + begin_inst <= '0'; + mem_we <= '0'; + multA <= (others => '0'); + multB <= (others => '0'); + mem_writeMask <= (others => '1'); + out_mem_req <= '0'; + mem_addr <= (others => DontCareValue); + mem_write <= (others => DontCareValue); + inInterrupt <= '0'; + elsif (clk'event and clk = '1') then + -- we must multiply unconditionally to get pipelined multiplication + tMultResult := multA * multB; + multResult3 <= multResult2; + multResult2 <= multResult; + multResult <= tMultResult(wordSize-1 downto 0); + + + spOffset(4):=not opcode(conv_integer(pc(byteBits-1 downto 0)))(4); + spOffset(3 downto 0):=opcode(conv_integer(pc(byteBits-1 downto 0)))(3 downto 0); + nextPC := pc + 1; + + -- prepare trace snapshot + trace_opcode <= opcode(conv_integer(pc(byteBits-1 downto 0))); + trace_pc <= pc; + trace_sp <= sp; + trace_topOfStack <= stackA; + trace_topOfStackB <= stackB; + begin_inst <= '0'; + + -- we terminate the requeset as soon as we get acknowledge + if mem_ack = '1' then + out_mem_req <= '0'; + mem_we <= '0'; + end if; + + if interrupt='0' then + inInterrupt <= '0'; -- no longer in an interrupt + end if; + + case state is + when State_Idle => + if enable='1' then + state <= State_Resync; + end if; + -- Initial state of ZPU, fetch top of stack + first instruction + when State_Resync => + if mem_busy='0' then + mem_addr <= sp; + out_mem_req <= '1'; + state <= State_Resync2; + end if; + when State_Resync2 => + if mem_busy='0' then + stackA <= mem_read; + mem_addr <= incSp; + out_mem_req <= '1'; + state <= State_Resync3; + end if; + when State_Resync3 => + if mem_busy='0' then + stackB <= mem_read; + mem_addr <= pc(maxAddrBitIncIO downto minAddrBit); + out_mem_req <= '1'; + state <= State_Decode; + end if; + when State_Decode => + if mem_busy='0' then + decodeWord <= mem_read; + state <= State_Decode2; + end if; + when State_Decode2 => + -- decode 4 instructions in parallel + for i in 0 to wordBytes-1 loop + tOpcode := decodeWord((wordBytes-1-i+1)*8-1 downto (wordBytes-1-i)*8); + + tSpOffset(4):=not tOpcode(4); + tSpOffset(3 downto 0):=tOpcode(3 downto 0); + + opcode(i) <= tOpcode; + if (tOpcode(7 downto 7)=OpCode_Im) then + tNextState:=State_Im; + elsif (tOpcode(7 downto 5)=OpCode_StoreSP) then + if tSpOffset = 0 then + tNextState := State_Pop; + elsif tSpOffset=1 then + tNextState := State_PopDown; + else + tNextState :=State_StoreSP; + end if; + elsif (tOpcode(7 downto 5)=OpCode_LoadSP) then + if tSpOffset = 0 then + tNextState :=State_Dup; + elsif tSpOffset = 1 then + tNextState :=State_DupStackB; + else + tNextState :=State_LoadSP; + end if; + elsif (tOpcode(7 downto 5)=OpCode_Emulate) then + tNextState :=State_Emulate; + if tOpcode(5 downto 0)=OpCode_Neqbranch then + tNextState :=State_Neqbranch; + elsif tOpcode(5 downto 0)=OpCode_Eq then + tNextState :=State_Eq; + elsif tOpcode(5 downto 0)=OpCode_Lessthan then + tNextState :=State_Lessthan; + elsif tOpcode(5 downto 0)=OpCode_Lessthanorequal then + --tNextState :=State_Lessthanorequal; + elsif tOpcode(5 downto 0)=OpCode_Ulessthan then + tNextState :=State_Ulessthan; + elsif tOpcode(5 downto 0)=OpCode_Ulessthanorequal then + --tNextState :=State_Ulessthanorequal; + elsif tOpcode(5 downto 0)=OpCode_Loadb then + tNextState :=State_Loadb; + elsif tOpcode(5 downto 0)=OpCode_Mult then + tNextState :=State_Mult; + elsif tOpcode(5 downto 0)=OpCode_Storeb then + tNextState :=State_Storeb; + elsif tOpcode(5 downto 0)=OpCode_Pushspadd then + tNextState :=State_Pushspadd; + elsif tOpcode(5 downto 0)=OpCode_Callpcrel then + tNextState :=State_Callpcrel; + elsif tOpcode(5 downto 0)=OpCode_Call then + --tNextState :=State_Call; + elsif tOpcode(5 downto 0)=OpCode_Sub then + tNextState :=State_Sub; + elsif tOpcode(5 downto 0)=OpCode_PopPCRel then + --tNextState :=State_PopPCRel; + end if; + elsif (tOpcode(7 downto 4)=OpCode_AddSP) then + if tSpOffset = 0 then + tNextState := State_Shift; + elsif tSpOffset = 1 then + tNextState := State_AddTop; + else + tNextState :=State_AddSP; + end if; + else + case tOpcode(3 downto 0) is + when OpCode_Nop => + tNextState :=State_Nop; + when OpCode_PushSP => + tNextState :=State_PushSP; + when OpCode_PopPC => + tNextState :=State_PopPC; + when OpCode_Add => + tNextState :=State_Add; + when OpCode_Or => + tNextState :=State_Or; + when OpCode_And => + tNextState :=State_And; + when OpCode_Load => + tNextState :=State_Load; + when OpCode_Not => + tNextState :=State_Not; + when OpCode_Flip => + tNextState :=State_Flip; + when OpCode_Store => + tNextState :=State_Store; + when OpCode_PopSP => + tNextState :=State_PopSP; + when others => + tNextState := State_Break; + + end case; + end if; + tDecodedOpcode(i) := tNextState; + + end loop; + + insn <= tDecodedOpcode(conv_integer(pc(byteBits-1 downto 0))); + + -- once we wrap, we need to fetch + tDecodedOpcode(0) := State_InsnFetch; + + decodedOpcode <= tDecodedOpcode; + state <= State_Execute; + + + + -- Each instruction must: + -- + -- 1. set idim_flag + -- 2. increase pc if applicable + -- 3. set next state if appliable + -- 4. do it's operation + + when State_Execute => + insn <= decodedOpcode(conv_integer(nextPC(byteBits-1 downto 0))); + + case insn is + when State_InsnFetch => + state <= State_Fetch; + when State_Im => + if mem_busy='0' then + begin_inst <= '1'; + idim_flag <= '1'; + pc <= pc + 1; + + if idim_flag='1' then + stackA(wordSize-1 downto 7) <= stackA(wordSize-8 downto 0); + stackA(6 downto 0) <= opcode(conv_integer(pc(byteBits-1 downto 0)))(6 downto 0); + else + out_mem_req <= '1'; + mem_we <= '1'; + mem_addr <= incSp; + mem_write <= stackB; + stackB <= stackA; + sp <= decSp; + for i in wordSize-1 downto 7 loop + stackA(i) <= opcode(conv_integer(pc(byteBits-1 downto 0)))(6); + end loop; + stackA(6 downto 0) <= opcode(conv_integer(pc(byteBits-1 downto 0)))(6 downto 0); + end if; + else + insn <= insn; + end if; + when State_StoreSP => + if mem_busy='0' then + begin_inst <= '1'; + idim_flag <= '0'; + state <= State_StoreSP2; + + out_mem_req <= '1'; + mem_we <= '1'; + mem_addr <= sp+spOffset; + mem_write <= stackA; + stackA <= stackB; + sp <= incSp; + else + insn <= insn; + end if; + + + when State_LoadSP => + if mem_busy='0' then + begin_inst <= '1'; + idim_flag <= '0'; + state <= State_LoadSP2; + + sp <= decSp; + out_mem_req <= '1'; + mem_we <= '1'; + mem_addr <= incSp; + mem_write <= stackB; + else + insn <= insn; + end if; + when State_Emulate => + if mem_busy='0' then + begin_inst <= '1'; + idim_flag <= '0'; + sp <= decSp; + out_mem_req <= '1'; + mem_we <= '1'; + mem_addr <= incSp; + mem_write <= stackB; + stackA <= (others => DontCareValue); + stackA(maxAddrBitIncIO downto 0) <= pc + 1; + stackB <= stackA; + + -- The emulate address is: + -- 98 7654 3210 + -- 0000 00aa aaa0 0000 + pc <= (others => '0'); + pc(9 downto 5) <= opcode(conv_integer(pc(byteBits-1 downto 0)))(4 downto 0); + state <= State_Fetch; + else + insn <= insn; + end if; + when State_Callpcrel => + if mem_busy='0' then + begin_inst <= '1'; + idim_flag <= '0'; + stackA <= (others => DontCareValue); + stackA(maxAddrBitIncIO downto 0) <= pc + 1; + + pc <= pc + stackA(maxAddrBitIncIO downto 0); + state <= State_Fetch; + else + insn <= insn; + end if; + when State_Call => + if mem_busy='0' then + begin_inst <= '1'; + idim_flag <= '0'; + stackA <= (others => DontCareValue); + stackA(maxAddrBitIncIO downto 0) <= pc + 1; + pc <= stackA(maxAddrBitIncIO downto 0); + state <= State_Fetch; + else + insn <= insn; + end if; + when State_AddSP => + if mem_busy='0' then + begin_inst <= '1'; + idim_flag <= '0'; + state <= State_AddSP2; + + out_mem_req <= '1'; + mem_addr <= sp+spOffset; + else + insn <= insn; + end if; + when State_PushSP => + if mem_busy='0' then + begin_inst <= '1'; + idim_flag <= '0'; + pc <= pc + 1; + + sp <= decSp; + stackA <= (others => '0'); + stackA(maxAddrBitIncIO downto minAddrBit) <= sp; + stackB <= stackA; + out_mem_req <= '1'; + mem_we <= '1'; + mem_addr <= incSp; + mem_write <= stackB; + else + insn <= insn; + end if; + when State_PopPC => + if mem_busy='0' then + begin_inst <= '1'; + idim_flag <= '0'; + pc <= stackA(maxAddrBitIncIO downto 0); + sp <= incSp; + + out_mem_req <= '1'; + mem_we <= '1'; + mem_addr <= incSp; + mem_write <= stackB; + state <= State_Resync; + else + insn <= insn; + end if; + when State_PopPCRel => + if mem_busy='0' then + begin_inst <= '1'; + idim_flag <= '0'; + pc <= stackA(maxAddrBitIncIO downto 0) + pc; + sp <= incSp; + + out_mem_req <= '1'; + mem_we <= '1'; + mem_addr <= incSp; + mem_write <= stackB; + state <= State_Resync; + else + insn <= insn; + end if; + when State_Add => + if mem_busy='0' then + begin_inst <= '1'; + idim_flag <= '0'; + stackA <= stackA + stackB; + + out_mem_req <= '1'; + mem_addr <= incIncSp; + sp <= incSp; + state <= State_Popped; + else + insn <= insn; + end if; + when State_Sub => + begin_inst <= '1'; + idim_flag <= '0'; + binaryOpResult <= stackB - stackA; + state <= State_BinaryOpResult; + when State_Pop => + if mem_busy='0' then + begin_inst <= '1'; + idim_flag <= '0'; + mem_addr <= incIncSp; + out_mem_req <= '1'; + sp <= incSp; + stackA <= stackB; + state <= State_Popped; + else + insn <= insn; + end if; + when State_PopDown => + if mem_busy='0' then + -- PopDown leaves top of stack unchanged + begin_inst <= '1'; + idim_flag <= '0'; + mem_addr <= incIncSp; + out_mem_req <= '1'; + sp <= incSp; + state <= State_Popped; + else + insn <= insn; + end if; + when State_Or => + if mem_busy='0' then + begin_inst <= '1'; + idim_flag <= '0'; + stackA <= stackA or stackB; + out_mem_req <= '1'; + mem_addr <= incIncSp; + sp <= incSp; + state <= State_Popped; + else + insn <= insn; + end if; + when State_And => + if mem_busy='0' then + begin_inst <= '1'; + idim_flag <= '0'; + + stackA <= stackA and stackB; + out_mem_req <= '1'; + mem_addr <= incIncSp; + sp <= incSp; + state <= State_Popped; + else + insn <= insn; + end if; + when State_Eq => + begin_inst <= '1'; + idim_flag <= '0'; + + binaryOpResult <= (others => '0'); + if (stackA=stackB) then + binaryOpResult(0) <= '1'; + end if; + state <= State_BinaryOpResult; + when State_Ulessthan => + begin_inst <= '1'; + idim_flag <= '0'; + + binaryOpResult <= (others => '0'); + if (stackA<stackB) then + binaryOpResult(0) <= '1'; + end if; + state <= State_BinaryOpResult; + when State_Ulessthanorequal => + begin_inst <= '1'; + idim_flag <= '0'; + + binaryOpResult <= (others => '0'); + if (stackA<=stackB) then + binaryOpResult(0) <= '1'; + end if; + state <= State_BinaryOpResult; + when State_Lessthan => + begin_inst <= '1'; + idim_flag <= '0'; + + binaryOpResult <= (others => '0'); + if (signed(stackA)<signed(stackB)) then + binaryOpResult(0) <= '1'; + end if; + state <= State_BinaryOpResult; + when State_Lessthanorequal => + begin_inst <= '1'; + idim_flag <= '0'; + + binaryOpResult <= (others => '0'); + if (signed(stackA)<=signed(stackB)) then + binaryOpResult(0) <= '1'; + end if; + state <= State_BinaryOpResult; + when State_Load => + if mem_busy='0' then + begin_inst <= '1'; + idim_flag <= '0'; + state <= State_Load2; + + mem_addr <= stackA(maxAddrBitIncIO downto minAddrBit); + out_mem_req <= '1'; + else + insn <= insn; + end if; + + when State_Dup => + if mem_busy='0' then + begin_inst <= '1'; + idim_flag <= '0'; + pc <= pc + 1; + + sp <= decSp; + stackB <= stackA; + mem_write <= stackB; + mem_addr <= incSp; + out_mem_req <= '1'; + mem_we <= '1'; + else + insn <= insn; + end if; + when State_DupStackB => + if mem_busy='0' then + begin_inst <= '1'; + idim_flag <= '0'; + pc <= pc + 1; + + sp <= decSp; + stackA <= stackB; + stackB <= stackA; + mem_write <= stackB; + mem_addr <= incSp; + out_mem_req <= '1'; + mem_we <= '1'; + else + insn <= insn; + end if; + when State_Store => + if mem_busy='0' then + begin_inst <= '1'; + idim_flag <= '0'; + pc <= pc + 1; + mem_addr <= stackA(maxAddrBitIncIO downto minAddrBit); + mem_write <= stackB; + out_mem_req <= '1'; + mem_we <= '1'; + sp <= incIncSp; + state <= State_Resync; + else + insn <= insn; + end if; + when State_PopSP => + if mem_busy='0' then + begin_inst <= '1'; + idim_flag <= '0'; + pc <= pc + 1; + + mem_write <= stackB; + mem_addr <= incSp; + out_mem_req <= '1'; + mem_we <= '1'; + sp <= stackA(maxAddrBitIncIO downto minAddrBit); + state <= State_Resync; + else + insn <= insn; + end if; + when State_Nop => + begin_inst <= '1'; + idim_flag <= '0'; + pc <= pc + 1; + when State_Not => + begin_inst <= '1'; + idim_flag <= '0'; + pc <= pc + 1; + + stackA <= not stackA; + when State_Flip => + begin_inst <= '1'; + idim_flag <= '0'; + pc <= pc + 1; + + for i in 0 to wordSize-1 loop + stackA(i) <= stackA(wordSize-1-i); + end loop; + when State_AddTop => + begin_inst <= '1'; + idim_flag <= '0'; + pc <= pc + 1; + + stackA <= stackA + stackB; + when State_Shift => + begin_inst <= '1'; + idim_flag <= '0'; + pc <= pc + 1; + + stackA(wordSize-1 downto 1) <= stackA(wordSize-2 downto 0); + stackA(0) <= '0'; + when State_Pushspadd => + begin_inst <= '1'; + idim_flag <= '0'; + pc <= pc + 1; + + stackA <= (others => '0'); + stackA(maxAddrBitIncIO downto minAddrBit) <= stackA(maxAddrBitIncIO-minAddrBit downto 0)+sp; + when State_Neqbranch => + -- branches are almost always taken as they form loops + begin_inst <= '1'; + idim_flag <= '0'; + sp <= incIncSp; + if (stackB/=0) then + pc <= stackA(maxAddrBitIncIO downto 0) + pc; + else + pc <= pc + 1; + end if; + -- need to fetch stack again. + state <= State_Resync; + when State_Mult => + begin_inst <= '1'; + idim_flag <= '0'; + + multA <= stackA; + multB <= stackB; + state <= State_Mult2; + when State_Break => + report "Break instruction encountered" severity failure; + break <= '1'; + + when State_Loadb => + if mem_busy='0' then + begin_inst <= '1'; + idim_flag <= '0'; + state <= State_Loadb2; + + mem_addr <= stackA(maxAddrBitIncIO downto minAddrBit); + out_mem_req <= '1'; + else + insn <= insn; + end if; + when State_Storeb => + if mem_busy='0' then + begin_inst <= '1'; + idim_flag <= '0'; + state <= State_Storeb2; + + mem_addr <= stackA(maxAddrBitIncIO downto minAddrBit); + out_mem_req <= '1'; + else + insn <= insn; + end if; + + when others => +-- sp <= (others => DontCareValue); + report "Illegal instruction" severity failure; + break <= '1'; + end case; + + + when State_StoreSP2 => + if mem_busy='0' then + mem_addr <= incSp; + out_mem_req <= '1'; + state <= State_Popped; + end if; + when State_LoadSP2 => + if mem_busy='0' then + state <= State_LoadSP3; + out_mem_req <= '1'; + mem_addr <= sp+spOffset+1; + end if; + when State_LoadSP3 => + if mem_busy='0' then + pc <= pc + 1; + state <= State_Execute; + stackB <= stackA; + stackA <= mem_read; + end if; + when State_AddSP2 => + if mem_busy='0' then + pc <= pc + 1; + state <= State_Execute; + stackA <= stackA + mem_read; + end if; + when State_Load2 => + if mem_busy='0' then + stackA <= mem_read; + pc <= pc + 1; + state <= State_Execute; + end if; + when State_Loadb2 => + if mem_busy='0' then + stackA <= (others => '0'); + stackA(7 downto 0) <= mem_read(((wordBytes-1-conv_integer(stackA(byteBits-1 downto 0)))*8+7) downto (wordBytes-1-conv_integer(stackA(byteBits-1 downto 0)))*8); + pc <= pc + 1; + state <= State_Execute; + end if; + when State_Storeb2 => + if mem_busy='0' then + mem_addr <= stackA(maxAddrBitIncIO downto minAddrBit); + mem_write <= mem_read; + mem_write(((wordBytes-1-conv_integer(stackA(byteBits-1 downto 0)))*8+7) downto (wordBytes-1-conv_integer(stackA(byteBits-1 downto 0)))*8) <= stackB(7 downto 0) ; + out_mem_req <= '1'; + mem_we <= '1'; + pc <= pc + 1; + sp <= incIncSp; + state <= State_Resync; + end if; + when State_Fetch => + if mem_busy='0' then + if interrupt='1' and inInterrupt='0' and idim_flag='0' then + -- We got an interrupt + inInterrupt <= '1'; + + sp <= decSp; + out_mem_req <= '1'; + mem_we <= '1'; + mem_addr <= incSp; + mem_write <= stackB; + stackA <= (others => DontCareValue); + stackA(maxAddrBitIncIO downto 0) <= pc; + stackB <= stackA; + + pc <= conv_std_logic_vector(32, maxAddrBitIncIo+1); -- interrupt address + + report "ZPU jumped to interrupt!" severity note; + else + mem_addr <= pc(maxAddrBitIncIO downto minAddrBit); + out_mem_req <= '1'; + state <= State_Decode; + end if; + end if; + when State_Mult2 => + state <= State_Mult3; + when State_Mult3 => + state <= State_Mult4; + when State_Mult4 => + state <= State_Mult5; + when State_Mult5 => + stackA <= multResult3; + state <= State_Mult6; + when State_Mult6 => + if mem_busy='0' then + out_mem_req <= '1'; + mem_addr <= incIncSp; + sp <= incSp; + state <= State_Popped; + end if; + when State_BinaryOpResult => + if mem_busy='0' then + -- NB!!!! we know that the memory isn't busy at this point!!!! + out_mem_req <= '1'; + mem_addr <= incIncSp; + sp <= incSp; + stackA <= binaryOpResult; + state <= State_Popped; + end if; + when State_Popped => + if mem_busy='0' then + pc <= pc + 1; + stackB <= mem_read; + state <= State_Execute; + end if; + when others => +-- sp <= (others => DontCareValue); + report "Illegal state" severity failure; + break <= '1'; + end case; + end if; + end process; + + + +end behave; diff --git a/fpga/usrp2/opencores/zpu/core/zpupkg.vhd b/fpga/usrp2/opencores/zpu/core/zpupkg.vhd new file mode 100644 index 000000000..a7e6cf1d0 --- /dev/null +++ b/fpga/usrp2/opencores/zpu/core/zpupkg.vhd @@ -0,0 +1,168 @@ +library IEEE; +use IEEE.STD_LOGIC_1164.all; +use IEEE.STD_LOGIC_ARITH.all; + +library work; +use work.zpu_config.all; + +package zpupkg is + + -- This bit is set for read/writes to IO + -- FIX!!! eventually this should be set to wordSize-1 so as to + -- to make the address of IO independent of amount of memory + -- reserved for CPU. Requires trivial tweaks in toolchain/runtime + -- libraries. + + constant byteBits : integer := wordPower-3; -- # of bits in a word that addresses bytes + constant maxAddrBit : integer := maxAddrBitIncIO-1; + constant ioBit : integer := maxAddrBit+1; + constant wordSize : integer := 2**wordPower; + constant wordBytes : integer := wordSize/8; + constant minAddrBit : integer := byteBits; + -- configurable internal stack size. Probably going to be 16 after toolchain is done + constant stack_bits : integer := 5; + constant stack_size : integer := 2**stack_bits; + + component dualport_ram is + port (clk : in std_logic; + memAWriteEnable : in std_logic; + memAAddr : in std_logic_vector(maxAddrBit downto minAddrBit); + memAWrite : in std_logic_vector(wordSize-1 downto 0); + memARead : out std_logic_vector(wordSize-1 downto 0); + memBWriteEnable : in std_logic; + memBAddr : in std_logic_vector(maxAddrBit downto minAddrBit); + memBWrite : in std_logic_vector(wordSize-1 downto 0); + memBRead : out std_logic_vector(wordSize-1 downto 0)); + end component; + + component dram is + port (clk : in std_logic; + areset : in std_logic; + mem_writeEnable : in std_logic; + mem_readEnable : in std_logic; + mem_addr : in std_logic_vector(maxAddrBit downto 0); + mem_write : in std_logic_vector(wordSize-1 downto 0); + mem_read : out std_logic_vector(wordSize-1 downto 0); + mem_busy : out std_logic; + mem_writeMask : in std_logic_vector(wordBytes-1 downto 0)); + end component; + + + component trace is + port( + clk : in std_logic; + begin_inst : in std_logic; + pc : in std_logic_vector(maxAddrBitIncIO downto 0); + opcode : in std_logic_vector(7 downto 0); + sp : in std_logic_vector(maxAddrBitIncIO downto minAddrBit); + memA : in std_logic_vector(wordSize-1 downto 0); + memB : in std_logic_vector(wordSize-1 downto 0); + busy : in std_logic; + intSp : in std_logic_vector(stack_bits-1 downto 0) + ); + end component; + + component zpu_core is + port ( clk : in std_logic; + areset : in std_logic; + enable : in std_logic; + mem_req : out std_logic; + mem_we : out std_logic; + mem_ack : in std_logic; + mem_read : in std_logic_vector(wordSize-1 downto 0); + mem_write : out std_logic_vector(wordSize-1 downto 0); + out_mem_addr : out std_logic_vector(maxAddrBitIncIO downto 0); + mem_writeMask: out std_logic_vector(wordBytes-1 downto 0); + interrupt : in std_logic; + break : out std_logic; + zpu_status : out std_logic_vector(63 downto 0)); + end component; + + + + component timer is + port( + clk : in std_logic; + areset : in std_logic; + sample : in std_logic; + reset : in std_logic; + counter : out std_logic_vector(63 downto 0)); + end component; + + component zpuio is + port ( areset : in std_logic; + cpu_clk : in std_logic; + clk_status : in std_logic_vector(2 downto 0); + cpu_din : in std_logic_vector(15 downto 0); + cpu_a : in std_logic_vector(20 downto 0); + cpu_we : in std_logic_vector(1 downto 0); + cpu_re : in std_logic; + cpu_dout : inout std_logic_vector(15 downto 0)); + end component; + + + + + -- opcode decode constants + constant OpCode_Im : std_logic_vector(7 downto 7) := "1"; + constant OpCode_StoreSP : std_logic_vector(7 downto 5) := "010"; + constant OpCode_LoadSP : std_logic_vector(7 downto 5) := "011"; + constant OpCode_Emulate : std_logic_vector(7 downto 5) := "001"; + constant OpCode_AddSP : std_logic_vector(7 downto 4) := "0001"; + constant OpCode_Short : std_logic_vector(7 downto 4) := "0000"; + + constant OpCode_Break : std_logic_vector(3 downto 0) := "0000"; + constant OpCode_Shiftleft: std_logic_vector(3 downto 0) := "0001"; + constant OpCode_PushSP : std_logic_vector(3 downto 0) := "0010"; + constant OpCode_PushInt : std_logic_vector(3 downto 0) := "0011"; + + constant OpCode_PopPC : std_logic_vector(3 downto 0) := "0100"; + constant OpCode_Add : std_logic_vector(3 downto 0) := "0101"; + constant OpCode_And : std_logic_vector(3 downto 0) := "0110"; + constant OpCode_Or : std_logic_vector(3 downto 0) := "0111"; + + constant OpCode_Load : std_logic_vector(3 downto 0) := "1000"; + constant OpCode_Not : std_logic_vector(3 downto 0) := "1001"; + constant OpCode_Flip : std_logic_vector(3 downto 0) := "1010"; + constant OpCode_Nop : std_logic_vector(3 downto 0) := "1011"; + + constant OpCode_Store : std_logic_vector(3 downto 0) := "1100"; + constant OpCode_PopSP : std_logic_vector(3 downto 0) := "1101"; + constant OpCode_Compare : std_logic_vector(3 downto 0) := "1110"; + constant OpCode_PopInt : std_logic_vector(3 downto 0) := "1111"; + + constant OpCode_Lessthan : std_logic_vector(5 downto 0) := conv_std_logic_vector(36, 6); + constant OpCode_Lessthanorequal : std_logic_vector(5 downto 0) := conv_std_logic_vector(37, 6); + constant OpCode_Ulessthan : std_logic_vector(5 downto 0) := conv_std_logic_vector(38, 6); + constant OpCode_Ulessthanorequal : std_logic_vector(5 downto 0) := conv_std_logic_vector(39, 6); + + constant OpCode_Swap : std_logic_vector(5 downto 0) := conv_std_logic_vector(40, 6); + constant OpCode_Mult : std_logic_vector(5 downto 0) := conv_std_logic_vector(41, 6); + + constant OpCode_Lshiftright : std_logic_vector(5 downto 0) := conv_std_logic_vector(42, 6); + constant OpCode_Ashiftleft : std_logic_vector(5 downto 0) := conv_std_logic_vector(43, 6); + constant OpCode_Ashiftright : std_logic_vector(5 downto 0) := conv_std_logic_vector(44, 6); + constant OpCode_Call : std_logic_vector(5 downto 0) := conv_std_logic_vector(45, 6); + + constant OpCode_Eq : std_logic_vector(5 downto 0) := conv_std_logic_vector(46, 6); + constant OpCode_Neq : std_logic_vector(5 downto 0) := conv_std_logic_vector(47, 6); + + constant OpCode_Sub : std_logic_vector(5 downto 0) := conv_std_logic_vector(49, 6); + constant OpCode_Loadb : std_logic_vector(5 downto 0) := conv_std_logic_vector(51, 6); + constant OpCode_Storeb : std_logic_vector(5 downto 0) := conv_std_logic_vector(52, 6); + + constant OpCode_Eqbranch : std_logic_vector(5 downto 0) := conv_std_logic_vector(55, 6); + constant OpCode_Neqbranch : std_logic_vector(5 downto 0) := conv_std_logic_vector(56, 6); + constant OpCode_Poppcrel : std_logic_vector(5 downto 0) := conv_std_logic_vector(57, 6); + + constant OpCode_Pushspadd : std_logic_vector(5 downto 0) := conv_std_logic_vector(61, 6); + constant OpCode_Mult16x16 : std_logic_vector(5 downto 0) := conv_std_logic_vector(62, 6); + constant OpCode_Callpcrel : std_logic_vector(5 downto 0) := conv_std_logic_vector(63, 6); + + + + constant OpCode_Size : integer := 8; + + + +end zpupkg; diff --git a/fpga/usrp2/opencores/zpu/wishbone/wishbone_pkg.vhd b/fpga/usrp2/opencores/zpu/wishbone/wishbone_pkg.vhd new file mode 100644 index 000000000..fbe9fc1d5 --- /dev/null +++ b/fpga/usrp2/opencores/zpu/wishbone/wishbone_pkg.vhd @@ -0,0 +1,86 @@ +-- ZPU +-- +-- Copyright 2004-2008 oharboe - Øyvind Harboe - oyvind.harboe@zylin.com +-- +-- The FreeBSD license +-- +-- Redistribution and use in source and binary forms, with or without +-- modification, are permitted provided that the following conditions +-- are met: +-- +-- 1. Redistributions of source code must retain the above copyright +-- notice, this list of conditions and the following disclaimer. +-- 2. Redistributions in binary form must reproduce the above +-- copyright notice, this list of conditions and the following +-- disclaimer in the documentation and/or other materials +-- provided with the distribution. +-- +-- THIS SOFTWARE IS PROVIDED BY THE ZPU PROJECT ``AS IS'' AND ANY +-- EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, +-- THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A +-- PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE +-- ZPU PROJECT OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, +-- INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES +-- (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS +-- OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) +-- HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, +-- STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) +-- ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF +-- ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. +-- +-- The views and conclusions contained in the software and documentation +-- are those of the authors and should not be interpreted as representing +-- official policies, either expressed or implied, of the ZPU Project. + +library IEEE; +use IEEE.STD_LOGIC_1164.all; +use IEEE.STD_LOGIC_UNSIGNED.ALL; + +package wishbone_pkg is + + type wishbone_bus_in is record + adr : std_logic_vector(15 downto 0); + sel : std_logic_vector(3 downto 0); + we : std_logic; + dat : std_logic_vector(31 downto 0); -- Note! Data written with 'we' + cyc : std_logic; + stb : std_logic; + end record; + + type wishbone_bus_out is record + dat : std_logic_vector(31 downto 0); + ack : std_logic; + end record; + + type wishbone_bus is record + insig : wishbone_bus_in; + outsig : wishbone_bus_out; + end record; + + component atomic32_access is + port ( cpu_clk : in std_logic; + areset : in std_logic; + + -- Wishbone from CPU interface + wb_16_i : in wishbone_bus_in; + wb_16_o : out wishbone_bus_out; + -- Wishbone to FPGA registers and ethernet core + wb_32_i : in wishbone_bus_out; + wb_32_o : out wishbone_bus_in); + end component; + + component eth_access_corr is + port ( cpu_clk : in std_logic; + areset : in std_logic; + + -- Wishbone from Wishbone MUX + eth_raw_o : out wishbone_bus_out; + eth_raw_i : in wishbone_bus_in; + + -- Wishbone ethernet core + eth_slave_i : in wishbone_bus_out; + eth_slave_o : out wishbone_bus_in); + end component; + + +end wishbone_pkg; diff --git a/fpga/usrp2/opencores/zpu/wishbone/zpu_system.vhd b/fpga/usrp2/opencores/zpu/wishbone/zpu_system.vhd new file mode 100644 index 000000000..976997123 --- /dev/null +++ b/fpga/usrp2/opencores/zpu/wishbone/zpu_system.vhd @@ -0,0 +1,105 @@ +-- ZPU +-- +-- Copyright 2004-2008 oharboe - Øyvind Harboe - oyvind.harboe@zylin.com +-- +-- The FreeBSD license +-- +-- Redistribution and use in source and binary forms, with or without +-- modification, are permitted provided that the following conditions +-- are met: +-- +-- 1. Redistributions of source code must retain the above copyright +-- notice, this list of conditions and the following disclaimer. +-- 2. Redistributions in binary form must reproduce the above +-- copyright notice, this list of conditions and the following +-- disclaimer in the documentation and/or other materials +-- provided with the distribution. +-- +-- THIS SOFTWARE IS PROVIDED BY THE ZPU PROJECT ``AS IS'' AND ANY +-- EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, +-- THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A +-- PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE +-- ZPU PROJECT OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, +-- INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES +-- (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS +-- OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) +-- HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, +-- STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) +-- ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF +-- ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. +-- +-- The views and conclusions contained in the software and documentation +-- are those of the authors and should not be interpreted as representing +-- official policies, either expressed or implied, of the ZPU Project. + +library IEEE; +use IEEE.STD_LOGIC_1164.all; +use IEEE.STD_LOGIC_UNSIGNED.all; + +library work; +use work.zpu_top_pkg.all; +use work.wishbone_pkg.all; +use work.zpupkg.all; +use work.zpu_config.all; + +entity zpu_system is + generic( + simulate : boolean := false); + port ( areset : in std_logic; + cpu_clk : in std_logic; + + -- ZPU Control signals + enable : in std_logic; + interrupt : in std_logic; + + zpu_status : out std_logic_vector(63 downto 0); + + -- wishbone interfaces + zpu_wb_i : in wishbone_bus_out; + zpu_wb_o : out wishbone_bus_in); +end zpu_system; + +architecture behave of zpu_system is + +signal mem_req : std_logic; +signal mem_we : std_logic; +signal mem_ack : std_logic; +signal mem_read : std_logic_vector(wordSize-1 downto 0); +signal mem_write : std_logic_vector(wordSize-1 downto 0); +signal out_mem_addr : std_logic_vector(maxAddrBitIncIO downto 0); +signal mem_writeMask : std_logic_vector(wordBytes-1 downto 0); + + +begin + + my_zpu_core: + zpu_core port map ( + clk => cpu_clk, + areset => areset, + enable => enable, + mem_req => mem_req, + mem_we => mem_we, + mem_ack => mem_ack, + mem_read => mem_read, + mem_write => mem_write, + out_mem_addr => out_mem_addr, + mem_writeMask => mem_writeMask, + interrupt => interrupt, + zpu_status => zpu_status, + break => open); + + my_zpu_wb_bridge: + zpu_wb_bridge port map ( + clk => cpu_clk, + areset => areset, + mem_req => mem_req, + mem_we => mem_we, + mem_ack => mem_ack, + mem_read => mem_read, + mem_write => mem_write, + out_mem_addr => out_mem_addr, + mem_writeMask => mem_writeMask, + zpu_wb_i => zpu_wb_i, + zpu_wb_o => zpu_wb_o); + +end behave; diff --git a/fpga/usrp2/opencores/zpu/wishbone/zpu_wb_bridge.vhd b/fpga/usrp2/opencores/zpu/wishbone/zpu_wb_bridge.vhd new file mode 100644 index 000000000..3eb46d82e --- /dev/null +++ b/fpga/usrp2/opencores/zpu/wishbone/zpu_wb_bridge.vhd @@ -0,0 +1,83 @@ +-- ZPU +-- +-- Copyright 2004-2008 oharboe - Øyvind Harboe - oyvind.harboe@zylin.com +-- +-- The FreeBSD license +-- +-- Redistribution and use in source and binary forms, with or without +-- modification, are permitted provided that the following conditions +-- are met: +-- +-- 1. Redistributions of source code must retain the above copyright +-- notice, this list of conditions and the following disclaimer. +-- 2. Redistributions in binary form must reproduce the above +-- copyright notice, this list of conditions and the following +-- disclaimer in the documentation and/or other materials +-- provided with the distribution. +-- +-- THIS SOFTWARE IS PROVIDED BY THE ZPU PROJECT ``AS IS'' AND ANY +-- EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, +-- THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A +-- PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE +-- ZPU PROJECT OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, +-- INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES +-- (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS +-- OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) +-- HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, +-- STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) +-- ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF +-- ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. +-- +-- The views and conclusions contained in the software and documentation +-- are those of the authors and should not be interpreted as representing +-- official policies, either expressed or implied, of the ZPU Project. + +library IEEE; +use IEEE.STD_LOGIC_1164.ALL; +use IEEE.STD_LOGIC_UNSIGNED.ALL; + +library work; +use work.zpu_top_pkg.all; +use work.wishbone_pkg.all; +use work.zpupkg.all; +use work.zpu_config.all; + +entity zpu_wb_bridge is + port ( -- Native ZPU interface + clk : in std_logic; + areset : in std_logic; + + mem_req : in std_logic; + mem_we : in std_logic; + mem_ack : out std_logic; + mem_read : out std_logic_vector(wordSize-1 downto 0); + mem_write : in std_logic_vector(wordSize-1 downto 0); + out_mem_addr : in std_logic_vector(maxAddrBitIncIO downto 0); + mem_writeMask : in std_logic_vector(wordBytes-1 downto 0); + + -- Wishbone from ZPU + zpu_wb_i : in wishbone_bus_out; + zpu_wb_o : out wishbone_bus_in); + +end zpu_wb_bridge; + +architecture behave of zpu_wb_bridge is + +begin + + mem_read <= zpu_wb_i.dat; + mem_ack <= zpu_wb_i.ack; + + zpu_wb_o.adr <= out_mem_addr; + zpu_wb_o.dat <= mem_write; + zpu_wb_o.sel <= mem_writeMask; + zpu_wb_o.stb <= mem_req; + zpu_wb_o.cyc <= mem_req; + zpu_wb_o.we <= mem_we; + +end behave; + + + + + diff --git a/fpga/usrp2/opencores/zpu/zpu_top_pkg.vhd b/fpga/usrp2/opencores/zpu/zpu_top_pkg.vhd new file mode 100644 index 000000000..23ff48c39 --- /dev/null +++ b/fpga/usrp2/opencores/zpu/zpu_top_pkg.vhd @@ -0,0 +1,46 @@ +library IEEE; +use IEEE.STD_LOGIC_1164.ALL; +use IEEE.STD_LOGIC_UNSIGNED.ALL; + +library work; +use work.zpupkg.all; +use work.zpu_config.all; +use work.wishbone_pkg.all; + +package zpu_top_pkg is + component zpu_wb_bridge is + port ( -- Native ZPU interface + clk : in std_logic; + areset : in std_logic; + + mem_req : in std_logic; + mem_we : in std_logic; + mem_ack : out std_logic; + mem_read : out std_logic_vector(wordSize-1 downto 0); + mem_write : in std_logic_vector(wordSize-1 downto 0); + out_mem_addr : in std_logic_vector(maxAddrBitIncIO downto 0); + mem_writeMask : in std_logic_vector(wordBytes-1 downto 0); + + -- Wishbone from ZPU + zpu_wb_i : in wishbone_bus_out; + zpu_wb_o : out wishbone_bus_in); + end component; + + component zpu_system is + generic( + simulate : boolean := false); + port ( areset : in std_logic; + cpu_clk : in std_logic; + + -- ZPU Control signals + enable : in std_logic; + interrupt : in std_logic; + + zpu_status : out std_logic_vector(63 downto 0); + + -- wishbone interfaces + zpu_wb_i : in wishbone_bus_out; + zpu_wb_o : out wishbone_bus_in); + end component; + +end zpu_top_pkg; diff --git a/fpga/usrp2/opencores/zpu/zpu_wb_top.vhd b/fpga/usrp2/opencores/zpu/zpu_wb_top.vhd new file mode 100644 index 000000000..48e5ee31d --- /dev/null +++ b/fpga/usrp2/opencores/zpu/zpu_wb_top.vhd @@ -0,0 +1,74 @@ +library IEEE; +use IEEE.STD_LOGIC_1164.ALL; +use IEEE.STD_LOGIC_UNSIGNED.ALL; + +library work; +use work.zpu_top_pkg.all; +use work.wishbone_pkg.all; +use work.zpupkg.all; +use work.zpu_config.all; + +------------------------------------------------------------------------ +-- Top level ZPU + wishbone componenent to use in a verilog design: +-- zpu_wb_top wraps around the zpu_system component. +-- All IO lines are exposed as std_logic for verilog. +------------------------------------------------------------------------ +entity zpu_wb_top is + generic ( + dat_w: integer := 32; + adr_w: integer := 16; + sel_w: integer := 4 + ); + port ( + clk: in std_logic; + rst: in std_logic; + enb: in std_logic; + + -- wishbone interface + dat_i: in std_logic_vector(dat_w-1 downto 0); + ack_i: in std_logic; + adr_o: out std_logic_vector(adr_w-1 downto 0); + sel_o: out std_logic_vector(sel_w-1 downto 0); + we_o: out std_logic; + dat_o: out std_logic_vector(dat_w-1 downto 0); + cyc_o: out std_logic; + stb_o: out std_logic; + + -- misc zpu signals + interrupt: in std_logic; + zpu_status: out std_logic_vector(63 downto 0) + ); + +end zpu_wb_top; + +architecture syn of zpu_wb_top is + +--wishbone interface (records) +signal zpu_wb_i: wishbone_bus_out; +signal zpu_wb_o: wishbone_bus_in; + +begin + +--assign wishbone signals to records +zpu_wb_i.dat <= dat_i; +zpu_wb_i.ack <= ack_i; + +adr_o <= zpu_wb_o.adr; +sel_o <= zpu_wb_o.sel; +we_o <= zpu_wb_o.we; +dat_o <= zpu_wb_o.dat; +cyc_o <= zpu_wb_o.cyc; +stb_o <= zpu_wb_o.stb; + +--instantiate the zpu system +zpu_system0: zpu_system port map( + cpu_clk => clk, + areset => rst, + enable => enb, + interrupt => interrupt, + zpu_status => zpu_status, + zpu_wb_i => zpu_wb_i, + zpu_wb_o => zpu_wb_o +); + +end architecture syn; |