diff options
Diffstat (limited to 'usrp2')
| -rw-r--r-- | usrp2/fifo/packet_router.v | 106 |
1 files changed, 100 insertions, 6 deletions
diff --git a/usrp2/fifo/packet_router.v b/usrp2/fifo/packet_router.v index 095dcd55d..0c79c200d 100644 --- a/usrp2/fifo/packet_router.v +++ b/usrp2/fifo/packet_router.v @@ -124,11 +124,6 @@ module packet_router wire dsp_frm_valid; wire dsp_frm_ready; - //TODO: tmp connect to dsp inp until we make the framer - assign dsp_frm_data = dsp_inp_data; - assign dsp_frm_valid = dsp_inp_valid; - assign dsp_inp_ready = dsp_frm_ready; - fifo36_mux com_output_source( .clk(stream_clk), .reset(stream_rst), .clear(1'b0), .data0_i(dsp_frm_data), .src0_rdy_i(dsp_frm_valid), .dst0_rdy_o(dsp_frm_ready), @@ -253,7 +248,7 @@ module packet_router CPU_INP_STATE_WAIT_CTRL_LO: begin if (cpu_inp_hs_ctrl == 1'b0) begin cpu_inp_state <= CPU_INP_STATE_UNLOAD; - cpu_inp_addr <= cpu_inp_addr_next; + cpu_inp_addr <= cpu_inp_addr_next; //BRAM has a setup delay and this is a bug end cpu_inp_flag_sof <= 1'b1; cpu_inp_flag_eof <= 1'b0; @@ -412,4 +407,103 @@ module packet_router endcase //com_insp_state end + //////////////////////////////////////////////////////////////////// + // DSP input framer + // - add a 1-line frame header to each DSP input packet + // - each header is composed of a byte count and flags + //////////////////////////////////////////////////////////////////// + + localparam DSP_FRM_STATE_WAIT_SOF = 0; + localparam DSP_FRM_STATE_WAIT_EOF = 1; + localparam DSP_FRM_STATE_WRITE_HDR = 2; + localparam DSP_FRM_STATE_WRITE = 3; + + reg [1:0] dsp_frm_state; + reg [BUF_SIZE-1:0] dsp_frm_addr; + reg [BUF_SIZE-1:0] dsp_frm_count; + wire [BUF_SIZE-1:0] dsp_frm_addr_next = dsp_frm_addr + 1'b1; + reg dsp_frm_valid_reg; //registered valid to deal with read delay + + //DSP input stream ready in the following states + assign dsp_inp_ready = + (dsp_frm_state == DSP_FRM_STATE_WAIT_SOF)? 1'b1 : ( + (dsp_frm_state == DSP_FRM_STATE_WAIT_EOF)? 1'b1 : ( + 1'b0)); + + //DSP framer output data mux (header or BRAM): + //The header is generated here from the count. + wire [31:0] dsp_frm_data_bram; + wire [15:0] dsp_frm_bytes = {dsp_frm_count, 2'b00}; + assign dsp_frm_data = + (dsp_frm_state == DSP_FRM_STATE_WRITE_HDR)? {4'b0001, 16'b1, dsp_frm_bytes} : ( + (dsp_frm_addr_next == dsp_frm_count) ? {4'b0010, dsp_frm_data_bram} : ( + {4'b0000, dsp_frm_data_bram})); + assign dsp_frm_valid = dsp_frm_valid_reg; + + RAMB16_S36_S36 dsp_frm_buff( + //port A = DSP input interface (writes to BRAM) + .DOA(),.ADDRA(dsp_frm_addr),.CLKA(stream_clk),.DIA(dsp_inp_data[31:0]),.DIPA(4'h0), + .ENA(dsp_inp_ready),.SSRA(0),.WEA(dsp_inp_ready), + //port B = DSP framer interface (reads from BRAM) + .DOB(dsp_frm_data_bram),.ADDRB(dsp_frm_addr),.CLKB(stream_clk),.DIB(36'b0),.DIPB(4'h0), + .ENB(1'b1),.SSRB(0),.WEB(1'b0) + ); + + always @(posedge stream_clk) + if(stream_rst) begin + dsp_frm_state <= DSP_FRM_STATE_WAIT_SOF; + dsp_frm_addr <= 0; + dsp_frm_valid_reg <= 1'b0; + end + else begin + case(dsp_frm_state) + DSP_FRM_STATE_WAIT_SOF: begin + if (dsp_inp_ready & dsp_inp_valid & dsp_inp_data[32]) begin + dsp_frm_addr <= dsp_frm_addr_next; + dsp_frm_state <= DSP_FRM_STATE_WAIT_EOF; + end + end + + DSP_FRM_STATE_WAIT_EOF: begin + if (dsp_inp_ready & dsp_inp_valid) begin + if (dsp_inp_data[33]) begin + dsp_frm_count <= dsp_frm_addr_next; + dsp_frm_addr <= 0; + dsp_frm_state <= DSP_FRM_STATE_WRITE_HDR; + end + else begin + dsp_frm_addr <= dsp_frm_addr_next; + end + end + end + + DSP_FRM_STATE_WRITE_HDR: begin + if (dsp_frm_ready & dsp_frm_valid) begin + dsp_frm_addr <= 0; + dsp_frm_state <= DSP_FRM_STATE_WRITE; + dsp_frm_valid_reg <= 1'b0; + end + else begin + dsp_frm_valid_reg <= 1'b1; + end + end + + DSP_FRM_STATE_WRITE: begin + if (dsp_frm_ready & dsp_frm_valid) begin + if (dsp_frm_data[33]) begin + dsp_frm_addr <= 0; + dsp_frm_state <= DSP_FRM_STATE_WAIT_SOF; + end + else begin + dsp_frm_addr <= dsp_frm_addr_next; + end + dsp_frm_valid_reg <= 1'b0; + end + else begin + dsp_frm_valid_reg <= 1'b1; + end + end + endcase //dsp_frm_state + end + endmodule // packet_router |