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-rw-r--r--fpga/usrp2/vrt/.gitignore4
-rwxr-xr-xfpga/usrp2/vrt/vita_rx.build1
-rw-r--r--fpga/usrp2/vrt/vita_rx_control.v180
-rw-r--r--fpga/usrp2/vrt/vita_rx_framer.v199
-rw-r--r--fpga/usrp2/vrt/vita_rx_tb.v213
-rwxr-xr-xfpga/usrp2/vrt/vita_tx.build1
-rw-r--r--fpga/usrp2/vrt/vita_tx_control.v98
-rw-r--r--fpga/usrp2/vrt/vita_tx_deframer.v187
-rw-r--r--fpga/usrp2/vrt/vita_tx_tb.v264
9 files changed, 1147 insertions, 0 deletions
diff --git a/fpga/usrp2/vrt/.gitignore b/fpga/usrp2/vrt/.gitignore
new file mode 100644
index 000000000..446b2daae
--- /dev/null
+++ b/fpga/usrp2/vrt/.gitignore
@@ -0,0 +1,4 @@
+vita_rx_tb
+vita_tx_tb
+*.vcd
+*.sav
diff --git a/fpga/usrp2/vrt/vita_rx.build b/fpga/usrp2/vrt/vita_rx.build
new file mode 100755
index 000000000..f6d2d75a3
--- /dev/null
+++ b/fpga/usrp2/vrt/vita_rx.build
@@ -0,0 +1 @@
+iverilog -Wimplict -Wportbind -y ../models -y . -y ../control_lib/ -y ../control_lib/newfifo -y ../coregen -y /opt/Xilinx/10.1/ISE/verilog/src/XilinxCoreLib -y /opt/Xilinx/10.1/ISE/verilog/src/unisims/ -y ../timing -o vita_rx_tb vita_rx_tb.v
diff --git a/fpga/usrp2/vrt/vita_rx_control.v b/fpga/usrp2/vrt/vita_rx_control.v
new file mode 100644
index 000000000..669b8299d
--- /dev/null
+++ b/fpga/usrp2/vrt/vita_rx_control.v
@@ -0,0 +1,180 @@
+
+module vita_rx_control
+ #(parameter BASE=0,
+ parameter WIDTH=32)
+ (input clk, input reset, input clear,
+ input set_stb, input [7:0] set_addr, input [31:0] set_data,
+
+ input [63:0] vita_time,
+ output overrun,
+
+ // To vita_rx_framer
+ output [4+64+WIDTH-1:0] sample_fifo_o,
+ output sample_fifo_src_rdy_o,
+ input sample_fifo_dst_rdy_i,
+
+ // From DSP Core
+ input [WIDTH-1:0] sample,
+ output run,
+ input strobe,
+
+ output [31:0] debug_rx
+ );
+
+ // FIXME add TX Interruption (halt, pause, continue) functionality
+
+ wire [63:0] new_time;
+ wire [31:0] new_command;
+ wire sc_pre1, clear_int, clear_reg;
+
+ assign clear_int = clear | clear_reg;
+
+ wire [63:0] rcvtime_pre;
+ reg [63:0] rcvtime;
+ wire [29:0] numlines_pre;
+ wire send_imm_pre, chain_pre;
+ reg send_imm, chain;
+ wire full_ctrl, read_ctrl, empty_ctrl, write_ctrl;
+ reg sc_pre2;
+ wire [33:0] fifo_line;
+ reg [29:0] lines_left;
+ reg [2:0] ibs_state;
+ wire now, early, late;
+ wire sample_fifo_in_rdy;
+
+ setting_reg #(.my_addr(BASE)) sr_cmd
+ (.clk(clk),.rst(reset),.strobe(set_stb),.addr(set_addr),
+ .in(set_data),.out(new_command),.changed());
+
+ setting_reg #(.my_addr(BASE+1)) sr_time_h
+ (.clk(clk),.rst(reset),.strobe(set_stb),.addr(set_addr),
+ .in(set_data),.out(new_time[63:32]),.changed());
+
+ setting_reg #(.my_addr(BASE+2)) sr_time_l
+ (.clk(clk),.rst(reset),.strobe(set_stb),.addr(set_addr),
+ .in(set_data),.out(new_time[31:0]),.changed(sc_pre1));
+
+ setting_reg #(.my_addr(BASE+3)) sr_clear
+ (.clk(clk),.rst(reset),.strobe(set_stb),.addr(set_addr),
+ .in(set_data),.out(),.changed(clear_reg));
+
+ // FIFO to store commands sent from the settings bus
+ always @(posedge clk)
+ sc_pre2 <= sc_pre1;
+ assign write_ctrl = sc_pre1 & ~sc_pre2;
+
+ wire [4:0] command_queue_len;
+ shortfifo #(.WIDTH(96)) commandfifo
+ (.clk(clk),.rst(reset),.clear(clear_int),
+ .datain({new_command,new_time}), .write(write_ctrl&~full_ctrl), .full(full_ctrl),
+ .dataout({send_imm_pre,chain_pre,numlines_pre,rcvtime_pre}),
+ .read(read_ctrl), .empty(empty_ctrl),
+ .occupied(command_queue_len), .space() );
+
+ reg [33:0] pkt_fifo_line;
+
+ localparam IBS_IDLE = 0;
+ localparam IBS_WAITING = 1;
+ localparam IBS_RUNNING = 2;
+ localparam IBS_OVERRUN = 4;
+ localparam IBS_BROKENCHAIN = 5;
+ localparam IBS_LATECMD = 6;
+
+ wire signal_cmd_done = (lines_left == 1) & (~chain | (~empty_ctrl & (numlines_pre==0)));
+ wire signal_overrun = (ibs_state == IBS_OVERRUN);
+ wire signal_brokenchain = (ibs_state == IBS_BROKENCHAIN);
+ wire signal_latecmd = (ibs_state == IBS_LATECMD);
+
+ // Buffer of samples for while we're writing the packet headers
+ wire [3:0] flags = {signal_overrun,signal_brokenchain,signal_latecmd,signal_cmd_done};
+
+ wire attempt_sample_write = ((run & strobe) | (ibs_state==IBS_OVERRUN) |
+ (ibs_state==IBS_BROKENCHAIN) | (ibs_state==IBS_LATECMD));
+
+ fifo_short #(.WIDTH(4+64+WIDTH)) rx_sample_fifo
+ (.clk(clk),.reset(reset),.clear(clear_int),
+ .datain({flags,vita_time,sample}), .src_rdy_i(attempt_sample_write), .dst_rdy_o(sample_fifo_in_rdy),
+ .dataout(sample_fifo_o),
+ .src_rdy_o(sample_fifo_src_rdy_o), .dst_rdy_i(sample_fifo_dst_rdy_i),
+ .space(), .occupied() );
+
+ // Inband Signalling State Machine
+ time_compare
+ time_compare (.time_now(vita_time), .trigger_time(rcvtime), .now(now), .early(early), .late(late));
+
+ wire too_late = late & ~send_imm;
+ wire go_now = now | send_imm;
+ wire full = ~sample_fifo_in_rdy;
+
+ always @(posedge clk)
+ if(reset | clear_int)
+ begin
+ ibs_state <= IBS_IDLE;
+ lines_left <= 0;
+ rcvtime <= 0;
+ send_imm <= 0;
+ chain <= 0;
+ end
+ else
+ case(ibs_state)
+ IBS_IDLE :
+ if(~empty_ctrl)
+ begin
+ lines_left <= numlines_pre;
+ rcvtime <= rcvtime_pre;
+ ibs_state <= IBS_WAITING;
+ send_imm <= send_imm_pre;
+ chain <= chain_pre;
+ end
+ IBS_WAITING :
+ if(go_now)
+ ibs_state <= IBS_RUNNING;
+ else if(too_late)
+ ibs_state <= IBS_LATECMD;
+ IBS_RUNNING :
+ if(strobe)
+ if(full)
+ ibs_state <= IBS_OVERRUN;
+ else
+ begin
+ lines_left <= lines_left - 1;
+ if(lines_left == 1)
+ if(~chain)
+ ibs_state <= IBS_IDLE;
+ else if(empty_ctrl)
+ ibs_state <= IBS_BROKENCHAIN;
+ else
+ begin
+ lines_left <= numlines_pre;
+ rcvtime <= rcvtime_pre;
+ send_imm <= send_imm_pre;
+ chain <= chain_pre;
+ if(numlines_pre == 0) // If we are told to stop here
+ ibs_state <= IBS_IDLE;
+ else
+ ibs_state <= IBS_RUNNING;
+ end
+ end // else: !if(full)
+ IBS_OVERRUN :
+ if(sample_fifo_in_rdy)
+ ibs_state <= IBS_IDLE;
+ IBS_LATECMD :
+ if(sample_fifo_in_rdy)
+ ibs_state <= IBS_IDLE;
+ IBS_BROKENCHAIN :
+ if(sample_fifo_in_rdy)
+ ibs_state <= IBS_IDLE;
+ endcase // case(ibs_state)
+
+ assign overrun = (ibs_state == IBS_OVERRUN);
+ assign run = (ibs_state == IBS_RUNNING);
+
+ assign read_ctrl = ( (ibs_state == IBS_IDLE) | ((ibs_state == IBS_RUNNING) & strobe & ~full & (lines_left==1) & chain) )
+ & ~empty_ctrl;
+
+ assign debug_rx = { { ibs_state[2:0], command_queue_len },
+ { 8'd0 },
+ { go_now, too_late, run, strobe, read_ctrl, write_ctrl, full_ctrl, empty_ctrl },
+ { 2'b0, overrun, chain_pre, sample_fifo_in_rdy, attempt_sample_write, sample_fifo_src_rdy_o,sample_fifo_dst_rdy_i} };
+
+endmodule // rx_control
diff --git a/fpga/usrp2/vrt/vita_rx_framer.v b/fpga/usrp2/vrt/vita_rx_framer.v
new file mode 100644
index 000000000..f3a81664a
--- /dev/null
+++ b/fpga/usrp2/vrt/vita_rx_framer.v
@@ -0,0 +1,199 @@
+
+module vita_rx_framer
+ #(parameter BASE=0,
+ parameter MAXCHAN=1)
+ (input clk, input reset, input clear,
+ input set_stb, input [7:0] set_addr, input [31:0] set_data,
+
+ // To FIFO interface of Buffer Pool
+ output [35:0] data_o,
+ input dst_rdy_i,
+ output src_rdy_o,
+
+ // From vita_rx_control
+ input [4+64+(32*MAXCHAN)-1:0] sample_fifo_i,
+ input sample_fifo_src_rdy_i,
+ output sample_fifo_dst_rdy_o,
+
+ // FIFO Levels
+ output [15:0] fifo_occupied,
+ output fifo_full,
+ output fifo_empty,
+
+ output [31:0] debug_rx
+ );
+
+ localparam SAMP_WIDTH = 4+64+(32*MAXCHAN);
+ reg [3:0] sample_phase;
+ wire [3:0] numchan;
+ wire [3:0] flags_fifo_o = sample_fifo_i[SAMP_WIDTH-1:SAMP_WIDTH-4];
+ wire [63:0] vita_time_fifo_o = sample_fifo_i[SAMP_WIDTH-5:SAMP_WIDTH-68];
+
+ reg [31:0] data_fifo_o;
+
+ // The tools won't synthesize properly without this kludge because of the variable
+ // parameter length
+
+ wire [127:0] FIXED_WIDTH_KLUDGE = sample_fifo_i;
+ always @*
+ case(sample_phase)
+ 4'd0 : data_fifo_o = FIXED_WIDTH_KLUDGE[31:0];
+ 4'd1 : data_fifo_o = FIXED_WIDTH_KLUDGE[63:32];
+ 4'd2 : data_fifo_o = FIXED_WIDTH_KLUDGE[95:64];
+ 4'd3 : data_fifo_o = FIXED_WIDTH_KLUDGE[127:96];
+ default : data_fifo_o = 32'hDEADBEEF;
+ endcase // case (sample_phase)
+
+ wire clear_pkt_count, pkt_fifo_rdy, sample_fifo_in_rdy;
+
+ wire [31:0] vita_header, vita_streamid, vita_trailer;
+ wire [15:0] samples_per_packet;
+
+ reg [33:0] pkt_fifo_line;
+ reg [3:0] vita_state;
+ reg [15:0] sample_ctr;
+ reg [3:0] pkt_count;
+
+ wire [15:0] vita_pkt_len = samples_per_packet + 6;
+ //wire [3:0] flags = {signal_overrun,signal_brokenchain,signal_latecmd,signal_cmd_done};
+
+ wire clear_reg;
+ wire clear_int = clear | clear_reg;
+
+ setting_reg #(.my_addr(BASE+3)) sr_clear
+ (.clk(clk),.rst(reset),.strobe(set_stb),.addr(set_addr),
+ .in(set_data),.out(),.changed(clear_reg));
+
+ setting_reg #(.my_addr(BASE+4)) sr_header
+ (.clk(clk),.rst(reset),.strobe(set_stb),.addr(set_addr),
+ .in(set_data),.out(vita_header),.changed());
+
+ setting_reg #(.my_addr(BASE+5)) sr_streamid
+ (.clk(clk),.rst(reset),.strobe(set_stb),.addr(set_addr),
+ .in(set_data),.out(vita_streamid),.changed(clear_pkt_count));
+
+ setting_reg #(.my_addr(BASE+6)) sr_trailer
+ (.clk(clk),.rst(reset),.strobe(set_stb),.addr(set_addr),
+ .in(set_data),.out(vita_trailer),.changed());
+
+ setting_reg #(.my_addr(BASE+7)) sr_samples_per_pkt
+ (.clk(clk),.rst(reset),.strobe(set_stb),.addr(set_addr),
+ .in(set_data),.out(samples_per_packet),.changed());
+
+ setting_reg #(.my_addr(BASE+8), .at_reset(1)) sr_numchan
+ (.clk(clk),.rst(reset),.strobe(set_stb),.addr(set_addr),
+ .in(set_data),.out(numchan),.changed());
+
+ // Output FIFO for packetized data
+ localparam VITA_IDLE = 0;
+ localparam VITA_HEADER = 1;
+ localparam VITA_STREAMID = 2;
+ localparam VITA_SECS = 3;
+ localparam VITA_TICS = 4;
+ localparam VITA_TICS2 = 5;
+ localparam VITA_PAYLOAD = 6;
+ localparam VITA_TRAILER = 7;
+ localparam VITA_ERR_HEADER = 9; // All ERR at 4'b1000 or'ed with base
+ localparam VITA_ERR_STREAMID = 10;
+ localparam VITA_ERR_SECS = 11;
+ localparam VITA_ERR_TICS = 12;
+ localparam VITA_ERR_TICS2 = 13;
+ localparam VITA_ERR_PAYLOAD = 14;
+ localparam VITA_ERR_TRAILER = 15;
+
+ always @(posedge clk)
+ if(reset | clear_pkt_count)
+ pkt_count <= 0;
+ else if((vita_state == VITA_TRAILER) & pkt_fifo_rdy)
+ pkt_count <= pkt_count + 1;
+
+ always @*
+ case(vita_state)
+ VITA_HEADER, VITA_ERR_HEADER : pkt_fifo_line <= {2'b01,vita_header[31:20],pkt_count,vita_pkt_len};
+ VITA_STREAMID, VITA_ERR_STREAMID : pkt_fifo_line <= {2'b00,vita_streamid};
+ VITA_SECS, VITA_ERR_SECS : pkt_fifo_line <= {2'b00,vita_time_fifo_o[63:32]};
+ VITA_TICS, VITA_ERR_TICS : pkt_fifo_line <= {2'b00,32'd0};
+ VITA_TICS2, VITA_ERR_TICS2 : pkt_fifo_line <= {2'b00,vita_time_fifo_o[31:0]};
+ VITA_PAYLOAD : pkt_fifo_line <= {2'b00,data_fifo_o};
+ VITA_ERR_PAYLOAD : pkt_fifo_line <= {2'b00,28'd0,flags_fifo_o};
+ VITA_TRAILER : pkt_fifo_line <= {2'b10,vita_trailer};
+ VITA_ERR_TRAILER : pkt_fifo_line <= {2'b11,vita_trailer};
+ default : pkt_fifo_line <= 34'h0_FFFF_FFFF;
+ endcase // case (vita_state)
+
+ always @(posedge clk)
+ if(reset)
+ begin
+ vita_state <= VITA_IDLE;
+ sample_ctr <= 0;
+ sample_phase <= 0;
+ end
+ else
+ if(vita_state==VITA_IDLE)
+ begin
+ sample_ctr <= 1;
+ sample_phase <= 0;
+ if(sample_fifo_src_rdy_i)
+ if(|flags_fifo_o[3:1])
+ vita_state <= VITA_ERR_HEADER;
+ else
+ vita_state <= VITA_HEADER;
+ end
+ else if(pkt_fifo_rdy)
+ case(vita_state)
+ VITA_PAYLOAD :
+ if(sample_fifo_src_rdy_i)
+ begin
+ if(sample_phase == (numchan-4'd1))
+ begin
+ sample_phase <= 0;
+ sample_ctr <= sample_ctr + 1;
+ if(sample_ctr == samples_per_packet)
+ vita_state <= VITA_TRAILER;
+ if(|flags_fifo_o) // end early if any flag is set
+ vita_state <= VITA_TRAILER;
+ end
+ else
+ sample_phase <= sample_phase + 1;
+ end
+ VITA_TRAILER, VITA_ERR_TRAILER :
+ vita_state <= VITA_IDLE;
+ default :
+ vita_state <= vita_state + 1;
+ endcase // case (vita_state)
+
+ reg req_write_pkt_fifo;
+ always @*
+ case(vita_state)
+ VITA_IDLE :
+ req_write_pkt_fifo <= 0;
+ VITA_HEADER, VITA_STREAMID, VITA_SECS, VITA_TICS, VITA_TICS2, VITA_TRAILER :
+ req_write_pkt_fifo <= 1;
+ VITA_PAYLOAD :
+ // Write if sample ready and no error flags
+ req_write_pkt_fifo <= (sample_fifo_src_rdy_i & ~|flags_fifo_o[3:1]);
+ VITA_ERR_HEADER, VITA_ERR_STREAMID, VITA_ERR_SECS, VITA_ERR_TICS, VITA_ERR_TICS2, VITA_ERR_PAYLOAD, VITA_ERR_TRAILER :
+ req_write_pkt_fifo <= 1;
+ default :
+ req_write_pkt_fifo <= 0;
+ endcase // case (vita_state)
+
+ //wire req_write_pkt_fifo = (vita_state != VITA_IDLE) & (sample_fifo_src_rdy_i | (vita_state != VITA_PAYLOAD));
+
+ // Short FIFO to buffer between us and the FIFOs outside
+ fifo_short #(.WIDTH(34)) rx_pkt_fifo
+ (.clk(clk), .reset(reset), .clear(clear_int),
+ .datain(pkt_fifo_line), .src_rdy_i(req_write_pkt_fifo), .dst_rdy_o(pkt_fifo_rdy),
+ .dataout(data_o[33:0]), .src_rdy_o(src_rdy_o), .dst_rdy_i(dst_rdy_i),
+ .space(),.occupied(fifo_occupied[4:0]) );
+ assign fifo_occupied[15:5] = 0;
+ assign data_o[35:34] = 2'b00; // Always write full lines
+ assign sample_fifo_dst_rdy_o = pkt_fifo_rdy &
+ ( ((vita_state==VITA_PAYLOAD) &
+ (sample_phase == (numchan-4'd1)) &
+ ~|flags_fifo_o[3:1]) |
+ (vita_state==VITA_ERR_TRAILER));
+
+ assign debug_rx = vita_state;
+
+endmodule // rx_control
diff --git a/fpga/usrp2/vrt/vita_rx_tb.v b/fpga/usrp2/vrt/vita_rx_tb.v
new file mode 100644
index 000000000..b4fda9622
--- /dev/null
+++ b/fpga/usrp2/vrt/vita_rx_tb.v
@@ -0,0 +1,213 @@
+
+
+module vita_rx_tb;
+
+ localparam DECIM = 8'd4;
+ localparam MAXCHAN=4;
+ localparam NUMCHAN=4;
+
+ reg clk = 0;
+ reg reset = 1;
+
+ initial #1000 reset = 0;
+ always #50 clk = ~clk;
+
+ initial $dumpfile("vita_rx_tb.vcd");
+ initial $dumpvars(0,vita_rx_tb);
+
+ wire [(MAXCHAN*32)-1:0] sample;
+ wire strobe, run;
+ wire [35:0] data_o;
+ wire src_rdy;
+ reg dst_rdy = 1;
+ wire [63:0] vita_time;
+
+ reg set_stb = 0;
+ reg [7:0] set_addr;
+ reg [31:0] set_data;
+ wire set_stb_dsp;
+ wire [7:0] set_addr_dsp;
+ wire [31:0] set_data_dsp;
+
+ /*
+ settings_bus_crossclock settings_bus_xclk_dsp
+ (.clk_i(clk), .rst_i(reset), .set_stb_i(set_stb), .set_addr_i(set_addr), .set_data_i(set_data),
+ .clk_o(clk), .rst_o(reset), .set_stb_o(set_stb_dsp), .set_addr_o(set_addr_dsp), .set_data_o(set_data_dsp));
+ */
+
+ wire sample_dst_rdy, sample_src_rdy;
+ //wire [99:0] sample_data_o;
+ wire [64+4+(MAXCHAN*32)-1:0] sample_data_o;
+
+ vita_rx_control #(.BASE(0), .WIDTH(32*MAXCHAN)) vita_rx_control
+ (.clk(clk), .reset(reset), .clear(0),
+ .set_stb(set_stb), .set_addr(set_addr), .set_data(set_data),
+ .vita_time(vita_time), .overrun(overrun),
+ .sample_fifo_o(sample_data_o), .sample_fifo_dst_rdy_i(sample_dst_rdy), .sample_fifo_src_rdy_o(sample_src_rdy),
+ .sample(sample), .run(run), .strobe(strobe));
+
+ vita_rx_framer #(.BASE(0), .MAXCHAN(MAXCHAN)) vita_rx_framer
+ (.clk(clk), .reset(reset), .clear(0),
+ .set_stb(set_stb), .set_addr(set_addr), .set_data(set_data),
+ .data_o(data_o), .dst_rdy_i(dst_rdy), .src_rdy_o(src_rdy),
+ .sample_fifo_i(sample_data_o), .sample_fifo_dst_rdy_o(sample_dst_rdy), .sample_fifo_src_rdy_i(sample_src_rdy),
+ .fifo_occupied(), .fifo_full(), .fifo_empty() );
+
+ rx_dsp_model rx_dsp_model
+ (.clk(clk), .reset(reset), .run(run), .decim(DECIM), .strobe(strobe), .sample(sample[31:0]));
+
+ generate
+ if(MAXCHAN>1)
+ assign sample[(MAXCHAN*32)-1:32] = 0;
+ endgenerate
+
+ time_64bit #(.TICKS_PER_SEC(120000000), .BASE(0)) time_64bit
+ (.clk(clk), .rst(reset),
+ .set_stb(set_stb), .set_addr(set_addr), .set_data(set_data),
+ .pps(0), .vita_time(vita_time));
+
+ always @(posedge clk)
+ if(src_rdy & dst_rdy)
+ begin
+ if(data_o[32] & ~data_o[33])
+ begin
+ $display("RX-PKT-START %d",$time);
+ $display(" RX-PKT-DAT %x",data_o[31:0]);
+ end
+ else if(data_o[32] & data_o[33])
+ begin
+ $display(" RX-PKT-DAT %x -- With ERR",data_o[31:0]);
+ $display("RX-PKT-ERR %d",$time);
+ end
+ else if(~data_o[32] & data_o[33])
+ begin
+ $display(" RX-PKT-DAT %x",data_o[31:0]);
+ $display("RX-PKT-END %d",$time);
+ end
+ else
+ $display(" RX-PKT DAT %x",data_o[31:0]);
+ end
+
+ initial
+ begin
+ @(negedge reset);
+ @(posedge clk);
+ write_setting(4,32'hDEADBEEF); // VITA header
+ write_setting(5,32'hF00D1234); // VITA streamid
+ write_setting(6,32'h98765432); // VITA trailer
+ write_setting(7,8); // Samples per VITA packet
+ write_setting(8,NUMCHAN); // Samples per VITA packet
+ queue_rx_cmd(1,0,8,32'h0,32'h0); // send imm, single packet
+ queue_rx_cmd(1,0,16,32'h0,32'h0); // send imm, 2 packets worth
+ queue_rx_cmd(1,0,7,32'h0,32'h0); // send imm, 1 short packet worth
+ queue_rx_cmd(1,0,9,32'h0,32'h0); // send imm, just longer than 1 packet
+
+ queue_rx_cmd(1,1,16,32'h0,32'h0); // chained
+ queue_rx_cmd(0,0,8,32'h0,32'h0); // 2nd in chain
+
+ queue_rx_cmd(1,1,17,32'h0,32'h0); // chained, odd length
+ queue_rx_cmd(0,0,9,32'h0,32'h0); // 2nd in chain, also odd length
+
+ queue_rx_cmd(0,0,8,32'h0,32'h340); // send at, on time
+ queue_rx_cmd(0,0,8,32'h0,32'h100); // send at, but late
+
+ queue_rx_cmd(1,1,8,32'h0,32'h0); // chained, but break chain
+ #100000;
+ $display("\nEnd chain with zero samples, shouldn't error\n");
+ queue_rx_cmd(1,1,8,32'h0,32'h0); // chained
+ queue_rx_cmd(0,0,0,32'h0,32'h0); // end chain with zero samples, should keep us out of error
+ #100000;
+
+ $display("\nEnd chain with zero samples on odd-length, shouldn't error\n");
+ queue_rx_cmd(1,1,14,32'h0,32'h0); // chained
+ queue_rx_cmd(0,0,0,32'h0,32'h0); // end chain with zero samples, should keep us out of error
+ #100000;
+ $display("Should have gotten 14 samples and EOF by now\n");
+
+ queue_rx_cmd(1,1,9,32'h0,32'h0); // chained, but break chain, odd length
+ #100000;
+ dst_rdy <= 0; // stop pulling out of fifo so we can get an overrun
+ queue_rx_cmd(1,0,100,32'h0,32'h0); // long enough to fill the fifos
+ queue_rx_cmd(1,0,5,32'h0,32'h0); // this command waits until the previous error packet is sent
+ #100000;
+ dst_rdy <= 1; // restart the reads so we can see what we got
+ #100000;
+ dst_rdy <= 0; // stop pulling out of fifo so we can get an overrun
+ queue_rx_cmd(1,1,100,32'h0,32'h0); // long enough to fill the fifos
+ //queue_rx_cmd(1,0,5,32'h0,32'h0); // this command waits until the previous error packet is sent
+ #100000;
+ @(posedge clk);
+ dst_rdy <= 1;
+
+ #100000 $finish;
+ end
+
+ task write_setting;
+ input [7:0] addr;
+ input [31:0] data;
+ begin
+ set_stb <= 0;
+ @(posedge clk);
+ set_addr <= addr;
+ set_data <= data;
+ set_stb <= 1;
+ @(posedge clk);
+ set_stb <= 0;
+ end
+ endtask // write_setting
+
+ task queue_rx_cmd;
+ input send_imm;
+ input chain;
+ input [29:0] lines;
+ input [31:0] secs;
+ input [31:0] tics;
+ begin
+ write_setting(0,{send_imm,chain,lines});
+ write_setting(1,secs);
+ write_setting(2,tics);
+ end
+ endtask // queue_rx_cmd
+
+endmodule // rx_control_tb
+
+module rx_dsp_model
+ (input clk, input reset,
+ input run,
+ input [7:0] decim,
+ output strobe,
+ output [31:0] sample);
+
+ reg [15:0] pktnum = 0;
+ reg [15:0] counter = 0;
+
+ reg run_d1;
+ always @(posedge clk) run_d1 <= run;
+
+ always @(posedge clk)
+ if(run & ~run_d1)
+ begin
+ counter <= 0;
+ pktnum <= pktnum + 1;
+ end
+ else if(run & strobe)
+ counter <= counter + 1;
+
+ assign sample = {pktnum,counter};
+
+ reg [7:0] stb_ctr = 0;
+
+ always @(posedge clk)
+ if(reset)
+ stb_ctr <= 0;
+ else if(run & ~run_d1)
+ stb_ctr <= 1;
+ else if(run)
+ if(stb_ctr == decim-1)
+ stb_ctr <= 0;
+ else
+ stb_ctr <= stb_ctr + 1;
+
+ assign strobe = stb_ctr == decim-1;
+
+endmodule // rx_dsp_model
diff --git a/fpga/usrp2/vrt/vita_tx.build b/fpga/usrp2/vrt/vita_tx.build
new file mode 100755
index 000000000..902929c08
--- /dev/null
+++ b/fpga/usrp2/vrt/vita_tx.build
@@ -0,0 +1 @@
+iverilog -Wimplict -Wportbind -y ../sdr_lib -y ../models -y . -y ../control_lib/ -y ../control_lib/newfifo -y ../coregen -y /opt/Xilinx/10.1/ISE/verilog/src/XilinxCoreLib -y /opt/Xilinx/10.1/ISE/verilog/src/unisims/ -y ../timing -o vita_tx_tb vita_tx_tb.v
diff --git a/fpga/usrp2/vrt/vita_tx_control.v b/fpga/usrp2/vrt/vita_tx_control.v
new file mode 100644
index 000000000..bffc64e52
--- /dev/null
+++ b/fpga/usrp2/vrt/vita_tx_control.v
@@ -0,0 +1,98 @@
+
+module vita_tx_control
+ #(parameter BASE=0,
+ parameter WIDTH=32)
+ (input clk, input reset, input clear,
+ input set_stb, input [7:0] set_addr, input [31:0] set_data,
+
+ input [63:0] vita_time,
+ output underrun,
+
+ // From vita_tx_deframer
+ input [4+64+WIDTH-1:0] sample_fifo_i,
+ input sample_fifo_src_rdy_i,
+ output sample_fifo_dst_rdy_o,
+
+ // To DSP Core
+ output [WIDTH-1:0] sample,
+ output run,
+ input strobe,
+
+ output [31:0] debug
+ );
+
+ assign sample = sample_fifo_i[4+64+WIDTH-1:4+64];
+
+ wire [63:0] send_time = sample_fifo_i[63:0];
+ wire eop = sample_fifo_i[64];
+ wire eob = sample_fifo_i[65];
+ wire sob = sample_fifo_i[66];
+ wire send_at = sample_fifo_i[67];
+ wire now, early, late, too_early;
+
+ // FIXME ignore too_early for now for timing reasons
+ assign too_early = 0;
+ time_compare
+ time_compare (.time_now(vita_time), .trigger_time(send_time), .now(now), .early(early),
+ .late(late), .too_early());
+// .late(late), .too_early(too_early));
+
+ localparam IBS_IDLE = 0;
+ localparam IBS_RUN = 1; // FIXME do we need this?
+ localparam IBS_CONT_BURST = 2;
+ localparam IBS_UNDERRUN = 3;
+ localparam IBS_UNDERRUN_DONE = 4;
+
+ reg [2:0] ibs_state;
+
+ wire clear_state;
+ setting_reg #(.my_addr(BASE+1)) sr
+ (.clk(clk),.rst(rst),.strobe(set_stb),.addr(set_addr),
+ .in(set_data),.out(),.changed(clear_state));
+
+ always @(posedge clk)
+ if(reset | clear_state)
+ ibs_state <= 0;
+ else
+ case(ibs_state)
+ IBS_IDLE :
+ if(sample_fifo_src_rdy_i)
+ if(~send_at | now)
+ ibs_state <= IBS_RUN;
+ else if(late | too_early)
+ ibs_state <= IBS_UNDERRUN;
+
+ IBS_RUN :
+ if(strobe)
+ if(~sample_fifo_src_rdy_i)
+ ibs_state <= IBS_UNDERRUN;
+ else if(eop)
+ if(eob)
+ ibs_state <= IBS_IDLE;
+ else
+ ibs_state <= IBS_CONT_BURST;
+
+ IBS_CONT_BURST :
+ if(strobe)
+ ibs_state <= IBS_UNDERRUN_DONE;
+ else if(sample_fifo_src_rdy_i)
+ ibs_state <= IBS_RUN;
+
+ IBS_UNDERRUN :
+ if(sample_fifo_src_rdy_i & eop)
+ ibs_state <= IBS_UNDERRUN_DONE;
+
+ IBS_UNDERRUN_DONE :
+ ;
+ endcase // case (ibs_state)
+
+ assign sample_fifo_dst_rdy_o = (ibs_state == IBS_UNDERRUN) | (strobe & (ibs_state == IBS_RUN)); // FIXME also cleanout
+ assign run = (ibs_state == IBS_RUN) | (ibs_state == IBS_CONT_BURST);
+ assign underrun = (ibs_state == IBS_UNDERRUN_DONE);
+
+ assign debug = { { now,early,late,too_early,eop,eob,sob,send_at },
+ { sample_fifo_src_rdy_i, sample_fifo_dst_rdy_o, strobe, run, underrun, ibs_state[2:0] },
+ { 8'b0 },
+ { 8'b0 } };
+
+endmodule // vita_tx_control
diff --git a/fpga/usrp2/vrt/vita_tx_deframer.v b/fpga/usrp2/vrt/vita_tx_deframer.v
new file mode 100644
index 000000000..49428ead5
--- /dev/null
+++ b/fpga/usrp2/vrt/vita_tx_deframer.v
@@ -0,0 +1,187 @@
+
+module vita_tx_deframer
+ #(parameter BASE=0,
+ parameter MAXCHAN=1)
+ (input clk, input reset, input clear,
+ input set_stb, input [7:0] set_addr, input [31:0] set_data,
+
+ // To FIFO interface of Buffer Pool
+ input [35:0] data_i,
+ input src_rdy_i,
+ output dst_rdy_o,
+
+ output [4+64+(32*MAXCHAN)-1:0] sample_fifo_o,
+ output sample_fifo_src_rdy_o,
+ input sample_fifo_dst_rdy_i,
+
+ // FIFO Levels
+ output [15:0] fifo_occupied,
+ output fifo_full,
+ output fifo_empty,
+ output [31:0] debug
+ );
+
+ wire [1:0] numchan;
+ setting_reg #(.my_addr(BASE), .at_reset(0)) sr_numchan
+ (.clk(clk),.rst(reset),.strobe(set_stb),.addr(set_addr),
+ .in(set_data),.out(numchan),.changed());
+
+ reg [3:0] vita_state;
+ wire has_streamid, has_classid, has_secs, has_tics, has_trailer;
+ assign has_streamid = (data_i[31:28]==4'b001);
+ assign has_classid = data_i[27];
+ assign has_secs = ~(data_i[23:22]==2'b00);
+ assign has_tics = ~(data_i[21:20]==2'b00);
+ assign has_trailer = data_i[26];
+ assign is_sob = data_i[25];
+ assign is_eob = data_i[24];
+ wire eof = data_i[33];
+
+ reg has_streamid_reg, has_classid_reg, has_secs_reg, has_tics_reg;
+ reg has_trailer_reg, is_sob_reg, is_eob_reg;
+
+ reg [15:0] pkt_len;
+ reg [1:0] vector_phase;
+ wire line_done;
+
+ // Output FIFO for packetized data
+ localparam VITA_HEADER = 0;
+ localparam VITA_STREAMID = 1;
+ localparam VITA_CLASSID = 2;
+ localparam VITA_CLASSID2 = 3;
+ localparam VITA_SECS = 4;
+ localparam VITA_TICS = 5;
+ localparam VITA_TICS2 = 6;
+ localparam VITA_PAYLOAD = 7;
+ localparam VITA_STORE = 8;
+ localparam VITA_TRAILER = 9;
+
+ wire [15:0] hdr_len = 2 + has_streamid_reg + has_classid_reg + has_classid_reg + has_secs_reg +
+ has_tics_reg + has_tics_reg + has_trailer_reg;
+
+ wire eop = eof | (pkt_len==hdr_len); // FIXME would ignoring eof allow larger VITA packets?
+ wire fifo_space;
+
+ always @(posedge clk)
+ if(reset | clear)
+ begin
+ vita_state <= VITA_HEADER;
+ {has_streamid_reg, has_classid_reg, has_secs_reg, has_tics_reg, has_trailer_reg, is_sob_reg, is_eob_reg}
+ <= 0;
+ end
+ else
+ if((vita_state == VITA_STORE) & fifo_space)
+ if(eop)
+ if(has_trailer_reg)
+ vita_state <= VITA_TRAILER;
+ else
+ vita_state <= VITA_HEADER;
+ else
+ begin
+ vita_state <= VITA_PAYLOAD;
+ pkt_len <= pkt_len - 1;
+ end
+ else if(src_rdy_i)
+ case(vita_state)
+ VITA_HEADER :
+ begin
+ {has_streamid_reg, has_classid_reg, has_secs_reg, has_tics_reg, has_trailer_reg, is_sob_reg, is_eob_reg}
+ <= {has_streamid, has_classid, has_secs, has_tics, has_trailer, is_sob, is_eob};
+ pkt_len <= data_i[15:0];
+ vector_phase <= 0;
+ if(has_streamid)
+ vita_state <= VITA_STREAMID;
+ else if(has_classid)
+ vita_state <= VITA_CLASSID;
+ else if(has_secs)
+ vita_state <= VITA_SECS;
+ else if(has_tics)
+ vita_state <= VITA_TICS;
+ else
+ vita_state <= VITA_PAYLOAD;
+ end // case: VITA_HEADER
+ VITA_STREAMID :
+ if(has_classid_reg)
+ vita_state <= VITA_CLASSID;
+ else if(has_secs_reg)
+ vita_state <= VITA_SECS;
+ else if(has_tics_reg)
+ vita_state <= VITA_TICS;
+ else
+ vita_state <= VITA_PAYLOAD;
+ VITA_CLASSID :
+ vita_state <= VITA_CLASSID2;
+ VITA_CLASSID2 :
+ if(has_secs_reg)
+ vita_state <= VITA_SECS;
+ else if(has_tics_reg)
+ vita_state <= VITA_TICS;
+ else
+ vita_state <= VITA_PAYLOAD;
+ VITA_SECS :
+ if(has_tics_reg)
+ vita_state <= VITA_TICS;
+ else
+ vita_state <= VITA_PAYLOAD;
+ VITA_TICS :
+ vita_state <= VITA_TICS2;
+ VITA_TICS2 :
+ vita_state <= VITA_PAYLOAD;
+ VITA_PAYLOAD :
+ if(line_done)
+ begin
+ vector_phase <= 0;
+ vita_state <= VITA_STORE;
+ end
+ else
+ vector_phase <= vector_phase + 1;
+ VITA_TRAILER :
+ vita_state <= VITA_HEADER;
+ VITA_STORE :
+ ;
+ default :
+ vita_state <= VITA_HEADER;
+ endcase // case (vita_state)
+
+ assign line_done = (vector_phase == numchan);
+
+ wire [4+64+32*MAXCHAN-1:0] fifo_i;
+ reg [63:0] send_time;
+ reg [31:0] sample_a, sample_b, sample_c, sample_d;
+
+ always @(posedge clk)
+ case(vita_state)
+ VITA_SECS :
+ send_time[63:32] <= data_i[31:0];
+ VITA_TICS2 :
+ send_time[31:0] <= data_i[31:0];
+ VITA_STORE, VITA_HEADER :
+ send_time[63:0] <= 64'd0;
+ endcase // case (vita_state)
+
+ always @(posedge clk)
+ if(vita_state == VITA_PAYLOAD)
+ case(vector_phase)
+ 0: sample_a <= data_i[31:0];
+ 1: sample_b <= data_i[31:0];
+ 2: sample_c <= data_i[31:0];
+ 3: sample_d <= data_i[31:0];
+ endcase // case (vector_phase)
+
+ wire store = (vita_state == VITA_STORE);
+ fifo_short #(.WIDTH(4+64+32*MAXCHAN)) short_tx_q
+ (.clk(clk), .reset(reset), .clear(clear),
+ .datain(fifo_i), .src_rdy_i(store), .dst_rdy_o(fifo_space),
+ .dataout(sample_fifo_o), .src_rdy_o(sample_fifo_src_rdy_o), .dst_rdy_i(sample_fifo_dst_rdy_i) );
+
+ // sob, eob, has_secs (send_at) ignored on all lines except first
+ assign fifo_i = {sample_d,sample_c,sample_b,sample_a,has_secs_reg,is_sob_reg,is_eob_reg,eop,send_time};
+
+ assign dst_rdy_o = ~(vita_state == VITA_PAYLOAD) & ~((vita_state==VITA_STORE)& ~fifo_space) ;
+
+ assign debug = { { 8'b0 },
+ { 8'b0 },
+ { eof, line_done, store, fifo_space, src_rdy_i, dst_rdy_o, vector_phase[1:0] },
+ { has_secs_reg, is_sob_reg, is_eob_reg, eop, vita_state[3:0] } };
+
+endmodule // vita_tx_deframer
diff --git a/fpga/usrp2/vrt/vita_tx_tb.v b/fpga/usrp2/vrt/vita_tx_tb.v
new file mode 100644
index 000000000..90986a35f
--- /dev/null
+++ b/fpga/usrp2/vrt/vita_tx_tb.v
@@ -0,0 +1,264 @@
+
+
+module vita_tx_tb;
+
+ localparam DECIM = 8'd4;
+ localparam INTERP = 8'd4;
+
+ localparam MAXCHAN=4;
+ localparam NUMCHAN=1;
+
+ reg clk = 0;
+ reg reset = 1;
+
+ initial #1000 reset = 0;
+ always #50 clk = ~clk;
+
+ initial $dumpfile("vita_tx_tb.vcd");
+ initial $dumpvars(0,vita_tx_tb);
+
+ wire [(MAXCHAN*32)-1:0] sample, sample_tx;
+ wire strobe, run;
+ wire [35:0] data_o;
+ wire src_rdy;
+ wire dst_rdy;
+
+ wire [63:0] vita_time;
+
+ reg set_stb = 0;
+ reg [7:0] set_addr;
+ reg [31:0] set_data;
+ wire set_stb_dsp;
+ wire [7:0] set_addr_dsp;
+ wire [31:0] set_data_dsp;
+
+ /*
+ settings_bus_crossclock settings_bus_xclk_dsp
+ (.clk_i(clk), .rst_i(reset), .set_stb_i(set_stb), .set_addr_i(set_addr), .set_data_i(set_data),
+ .clk_o(clk), .rst_o(reset), .set_stb_o(set_stb_dsp), .set_addr_o(set_addr_dsp), .set_data_o(set_data_dsp));
+ */
+
+ wire sample_dst_rdy, sample_src_rdy;
+ //wire [99:0] sample_data_o;
+ wire [64+4+(MAXCHAN*32)-1:0] sample_data_o, sample_data_tx;
+
+ time_64bit #(.TICKS_PER_SEC(100000000), .BASE(0)) time_64bit
+ (.clk(clk), .rst(reset),
+ .set_stb(set_stb), .set_addr(set_addr), .set_data(set_data),
+ .pps(0), .vita_time(vita_time));
+
+ rx_dsp_model rx_dsp_model
+ (.clk(clk), .reset(reset), .run(run), .decim(DECIM), .strobe(strobe), .sample(sample[31:0]));
+
+ generate
+ if(MAXCHAN>1)
+ assign sample[(MAXCHAN*32)-1:32] = 0;
+ endgenerate
+
+ vita_rx_control #(.BASE(0), .WIDTH(32*MAXCHAN)) vita_rx_control
+ (.clk(clk), .reset(reset), .clear(0),
+ .set_stb(set_stb), .set_addr(set_addr), .set_data(set_data),
+ .vita_time(vita_time), .overrun(overrun),
+ .sample_fifo_o(sample_data_o), .sample_fifo_dst_rdy_i(sample_dst_rdy), .sample_fifo_src_rdy_o(sample_src_rdy),
+ .sample(sample), .run(run), .strobe(strobe));
+
+ vita_rx_framer #(.BASE(0), .MAXCHAN(MAXCHAN)) vita_rx_framer
+ (.clk(clk), .reset(reset), .clear(0),
+ .set_stb(set_stb), .set_addr(set_addr), .set_data(set_data),
+ .data_o(data_o), .dst_rdy_i(dst_rdy), .src_rdy_o(src_rdy),
+ .sample_fifo_i(sample_data_o), .sample_fifo_dst_rdy_o(sample_dst_rdy), .sample_fifo_src_rdy_i(sample_src_rdy),
+ .fifo_occupied(), .fifo_full(), .fifo_empty() );
+
+ wire [35:0] data_tx;
+ wire src_rdy_tx, dst_rdy_tx;
+ wire sample_dst_rdy_tx, sample_src_rdy_tx;
+
+ fifo_long #(.WIDTH(36)) fifo_short
+ (.clk(clk), .reset(reset), .clear(0),
+ .datain(data_o), .src_rdy_i(src_rdy), .dst_rdy_o(dst_rdy),
+ .dataout(data_tx), .src_rdy_o(src_rdy_tx), .dst_rdy_i(dst_rdy_tx));
+
+ vita_tx_deframer #(.BASE(16), .MAXCHAN(MAXCHAN)) vita_tx_deframer
+ (.clk(clk), .reset(reset), .clear(0),
+ .set_stb(set_stb), .set_addr(set_addr), .set_data(set_data),
+ .data_i(data_tx), .dst_rdy_o(dst_rdy_tx), .src_rdy_i(src_rdy_tx),
+ .sample_fifo_o(sample_data_tx),
+ .sample_fifo_dst_rdy_i(sample_dst_rdy_tx), .sample_fifo_src_rdy_o(sample_src_rdy_tx),
+ .fifo_occupied(), .fifo_full(), .fifo_empty() );
+
+ vita_tx_control #(.BASE(16), .WIDTH(MAXCHAN*32)) vita_tx_control
+ (.clk(clk), .reset(reset), .clear(0),
+ .set_stb(set_stb), .set_addr(set_addr), .set_data(set_data),
+ .vita_time(vita_time-100), .underrun(underrun),
+ .sample_fifo_i(sample_data_tx),
+ .sample_fifo_dst_rdy_o(sample_dst_rdy_tx), .sample_fifo_src_rdy_i(sample_src_rdy_tx),
+ .sample(sample_tx), .run(run_tx), .strobe(strobe_tx));
+
+ tx_dsp_model tx_dsp_model
+ (.clk(clk), .reset(reset), .run(run_tx), .interp(INTERP), .strobe(strobe_tx), .sample(sample_tx[31:0] ));
+
+ always @(posedge clk)
+ if(src_rdy & dst_rdy)
+ begin
+ if(data_o[32] & ~data_o[33])
+ begin
+ $display("RX-PKT-START %d",$time);
+ $display(" RX-PKT-DAT %x",data_o[31:0]);
+ end
+ else if(data_o[32] & data_o[33])
+ begin
+ $display(" RX-PKT-DAT %x -- With ERR",data_o[31:0]);
+ $display("RX-PKT-ERR %d",$time);
+ end
+ else if(~data_o[32] & data_o[33])
+ begin
+ $display(" RX-PKT-DAT %x",data_o[31:0]);
+ $display("RX-PKT-END %d",$time);
+ end
+ else
+ $display(" RX-PKT DAT %x",data_o[31:0]);
+ end
+
+ initial
+ begin
+ @(negedge reset);
+ @(posedge clk);
+ write_setting(4,32'h14900008); // VITA header
+ write_setting(5,32'hF00D1234); // VITA streamid
+ write_setting(6,32'h98765432); // VITA trailer
+ write_setting(7,8); // Samples per VITA packet
+ write_setting(8,NUMCHAN); // Samples per VITA packet
+ #10000;
+
+ queue_rx_cmd(1,0,8,32'h0,32'h0); // send imm, single packet
+/*
+ queue_rx_cmd(1,0,16,32'h0,32'h0); // send imm, 2 packets worth
+ queue_rx_cmd(1,0,7,32'h0,32'h0); // send imm, 1 short packet worth
+ queue_rx_cmd(1,0,9,32'h0,32'h0); // send imm, just longer than 1 packet
+
+ queue_rx_cmd(1,1,16,32'h0,32'h0); // chained
+ queue_rx_cmd(0,0,8,32'h0,32'h0); // 2nd in chain
+
+ queue_rx_cmd(1,1,17,32'h0,32'h0); // chained, odd length
+ queue_rx_cmd(0,0,9,32'h0,32'h0); // 2nd in chain, also odd length
+
+ queue_rx_cmd(0,0,8,32'h0,32'h340); // send at, on time
+ queue_rx_cmd(0,0,8,32'h0,32'h100); // send at, but late
+
+ queue_rx_cmd(1,1,8,32'h0,32'h0); // chained, but break chain
+ #100000;
+ $display("\nEnd chain with zero samples, shouldn't error\n");
+ queue_rx_cmd(1,1,8,32'h0,32'h0); // chained
+ queue_rx_cmd(0,0,0,32'h0,32'h0); // end chain with zero samples, should keep us out of error
+ #100000;
+
+ $display("\nEnd chain with zero samples on odd-length, shouldn't error\n");
+ queue_rx_cmd(1,1,14,32'h0,32'h0); // chained
+ queue_rx_cmd(0,0,0,32'h0,32'h0); // end chain with zero samples, should keep us out of error
+ #100000;
+ $display("Should have gotten 14 samples and EOF by now\n");
+
+ queue_rx_cmd(1,1,9,32'h0,32'h0); // chained, but break chain, odd length
+ #100000;
+ //dst_rdy <= 0; // stop pulling out of fifo so we can get an overrun
+ queue_rx_cmd(1,0,100,32'h0,32'h0); // long enough to fill the fifos
+ queue_rx_cmd(1,0,5,32'h0,32'h0); // this command waits until the previous error packet is sent
+ #100000;
+ //dst_rdy <= 1; // restart the reads so we can see what we got
+ #100000;
+ //dst_rdy <= 0; // stop pulling out of fifo so we can get an overrun
+ queue_rx_cmd(1,1,100,32'h0,32'h0); // long enough to fill the fifos
+ //queue_rx_cmd(1,0,5,32'h0,32'h0); // this command waits until the previous error packet is sent
+ #100000;
+ @(posedge clk);
+ //dst_rdy <= 1;
+ */
+ #100000 $finish;
+ end
+
+ task write_setting;
+ input [7:0] addr;
+ input [31:0] data;
+ begin
+ set_stb <= 0;
+ @(posedge clk);
+ set_addr <= addr;
+ set_data <= data;
+ set_stb <= 1;
+ @(posedge clk);
+ set_stb <= 0;
+ end
+ endtask // write_setting
+
+ task queue_rx_cmd;
+ input send_imm;
+ input chain;
+ input [29:0] lines;
+ input [31:0] secs;
+ input [31:0] tics;
+ begin
+ write_setting(0,{send_imm,chain,lines});
+ write_setting(1,secs);
+ write_setting(2,tics);
+ end
+ endtask // queue_rx_cmd
+
+endmodule // vita_tx_tb
+
+
+module rx_dsp_model
+ (input clk, input reset,
+ input run,
+ input [7:0] decim,
+ output strobe,
+ output [31:0] sample);
+
+ reg [15:0] pktnum = 0;
+ reg [15:0] counter = 0;
+
+ reg run_d1;
+ always @(posedge clk) run_d1 <= run;
+
+ always @(posedge clk)
+ if(run & ~run_d1)
+ begin
+ counter <= 0;
+ pktnum <= pktnum + 1;
+ end
+ else if(run & strobe)
+ counter <= counter + 1;
+
+ assign sample = {pktnum,counter};
+
+ reg [7:0] stb_ctr = 0;
+
+ always @(posedge clk)
+ if(reset)
+ stb_ctr <= 0;
+ else if(run & ~run_d1)
+ stb_ctr <= 1;
+ else if(run)
+ if(stb_ctr == decim-1)
+ stb_ctr <= 0;
+ else
+ stb_ctr <= stb_ctr + 1;
+
+ assign strobe = stb_ctr == decim-1;
+
+endmodule // rx_dsp_model
+
+module tx_dsp_model
+ (input clk, input reset,
+ input run,
+ input [7:0] interp,
+ output strobe,
+ input [31:0] sample);
+
+ cic_strober strober(.clock(clk), .reset(reset), .enable(run), .rate(interp), .strobe_fast(1), .strobe_slow(strobe));
+
+ always @(posedge clk)
+ if(strobe)
+ $display("Time %d, Sent Sample %x",$time,sample);
+
+
+endmodule // tx_dsp_model
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