aboutsummaryrefslogtreecommitdiffstats
path: root/usrp2/extram/extram_wb.v
diff options
context:
space:
mode:
Diffstat (limited to 'usrp2/extram/extram_wb.v')
-rw-r--r--usrp2/extram/extram_wb.v146
1 files changed, 0 insertions, 146 deletions
diff --git a/usrp2/extram/extram_wb.v b/usrp2/extram/extram_wb.v
deleted file mode 100644
index c8428783a..000000000
--- a/usrp2/extram/extram_wb.v
+++ /dev/null
@@ -1,146 +0,0 @@
-
-module extram_wb
- #(parameter PAGE_SIZE = 10,
- parameter ADDR_WIDTH = 16)
- (input clk, input rst,
- input wb_clk, input wb_rst,
- input cyc_i, input stb_i,
- input [ADDR_WIDTH-1:0] adr_i,
- input we_i,
- input [31:0] dat_i,
- output reg [31:0] dat_o,
- output reg ack_o,
-
- inout [17:0] RAM_D,
- output [PAGE_SIZE-2:0] RAM_A,
- output RAM_CE1n, output RAM_CENn,
- output RAM_CLK, output RAM_WEn,
- output RAM_OEn, output RAM_LDn );
-
- wire read_acc = stb_i & cyc_i & ~we_i;
- wire write_acc = stb_i & cyc_i & we_i;
- wire acc = stb_i & cyc_i;
-
- assign RAM_CLK = ~wb_clk; // 50 MHz for now, eventually should be 200 MHz
- assign RAM_LDn = 0; // No burst for now
- assign RAM_CENn = 0; // Use CE1n as our main CE
-
- reg [PAGE_SIZE-2:1] RAM_addr_reg;
- always @(posedge wb_clk)
- if(acc)
- RAM_addr_reg[PAGE_SIZE-2:1] <= adr_i[PAGE_SIZE-1:2];
- assign RAM_A[PAGE_SIZE-2:1] = RAM_addr_reg;
-
- reg [31:0] ram_out;
- always @(posedge wb_clk)
- if(write_acc)
- ram_out <= dat_i;
-
- // RAM access state machine
- localparam RAM_idle = 0;
- localparam RAM_read_1 = 1;
- localparam RAM_read_2 = 2;
- localparam RAM_read_3 = 3;
- localparam RAM_read_4 = 4;
- localparam RAM_write_1 = 6;
- localparam RAM_write_2 = 7;
- localparam RAM_write_3 = 8;
- localparam RAM_write_4 = 9;
-
- reg myOE = 0;
- reg RAM_OE = 0;
- reg RAM_WE = 0;
- reg RAM_EN = 0;
- reg RAM_A0_reg;
- reg [3:0] RAM_state;
-
- always @(posedge wb_clk)
- if(wb_rst)
- begin
- RAM_state <= RAM_idle;
- myOE <= 0; RAM_OE <= 0; RAM_WE <= 0; RAM_EN <= 0; RAM_A0_reg <= 0;
- end
- else
- case(RAM_state)
- RAM_idle :
- if(read_acc & ~ack_o)
- begin
- RAM_state <= RAM_read_1;
- myOE <= 0; RAM_OE <= 0; RAM_WE <= 0; RAM_EN <= 1; RAM_A0_reg <= 0;
- end
- else if(write_acc & ~ack_o)
- begin
- RAM_state <= RAM_write_1;
- myOE <= 0; RAM_OE <= 0; RAM_WE <= 1; RAM_EN <= 1; RAM_A0_reg <= 0;
- end
- else
- begin
- myOE <= 0; RAM_OE <= 0; RAM_WE <= 0; RAM_EN <= 0; RAM_A0_reg <= 0;
- end
- RAM_read_1 :
- begin
- RAM_state <= RAM_read_2;
- myOE <= 0; RAM_OE <= 0; RAM_WE <= 0; RAM_EN <= 1; RAM_A0_reg <= 1;
- end
- RAM_read_2 :
- begin
- RAM_state <= RAM_read_3;
- myOE <= 0; RAM_OE <= 1; RAM_WE <= 0; RAM_EN <= 0; RAM_A0_reg <= 0;
- end
- RAM_read_3 :
- begin
- RAM_state <= RAM_read_4;
- myOE <= 0; RAM_OE <= 1; RAM_WE <= 0; RAM_EN <= 0; RAM_A0_reg <= 0;
- end
- RAM_read_4 :
- begin
- RAM_state <= RAM_idle;
- myOE <= 0; RAM_OE <= 0; RAM_WE <= 0; RAM_EN <= 0; RAM_A0_reg <= 0;
- end
- RAM_write_1 :
- begin
- RAM_state <= RAM_write_2;
- myOE <= 1; RAM_OE <= 0; RAM_WE <= 1; RAM_EN <= 1; RAM_A0_reg <= 1;
- end
- RAM_write_2 :
- begin
- RAM_state <= RAM_write_3;
- myOE <= 1; RAM_OE <= 0; RAM_WE <= 0; RAM_EN <= 0; RAM_A0_reg <= 0;
- end
- RAM_write_3 :
- begin
- RAM_state <= RAM_write_4;
- myOE <= 1; RAM_OE <= 0; RAM_WE <= 0; RAM_EN <= 0; RAM_A0_reg <= 0;
- end
- RAM_write_4 :
- begin
- RAM_state <= RAM_idle;
- myOE <= 0; RAM_OE <= 0; RAM_WE <= 0; RAM_EN <= 0; RAM_A0_reg <= 0;
- end
- default : RAM_state <= RAM_idle;
- endcase // case(RAM_state)
-
- assign RAM_A[0] = RAM_A0_reg;
- assign RAM_WEn = ~RAM_WE; // ((RAM_state==RAM_write_1)||(RAM_state==RAM_write_2));
- assign RAM_OEn = ~RAM_OE;
- assign RAM_CE1n = ~RAM_EN; // Active low (RAM_state != RAM_idle);
-
- assign RAM_D[17:16] = 2'bzz;
- assign RAM_D[15:0] = myOE ? ((RAM_state==RAM_write_2)?ram_out[15:0]:ram_out[31:16])
- : 16'bzzzz_zzzz_zzzz_zzzz;
-
- always @(posedge wb_clk)
- if(RAM_state == RAM_read_3)
- dat_o[15:0] <= RAM_D[15:0];
- else
- dat_o[31:16] <= RAM_D[15:0];
-
- always @(posedge wb_clk)
- if(wb_rst)
- ack_o <= 0;
- else if((RAM_state == RAM_write_4)||(RAM_state == RAM_read_4))
- ack_o <= 1;
- else
- ack_o <= 0;
-
-endmodule // extram_wb