diff options
Diffstat (limited to 'fpga/usrp2/vrt/vita_rx_chain.v')
| -rw-r--r-- | fpga/usrp2/vrt/vita_rx_chain.v | 114 |
1 files changed, 114 insertions, 0 deletions
diff --git a/fpga/usrp2/vrt/vita_rx_chain.v b/fpga/usrp2/vrt/vita_rx_chain.v new file mode 100644 index 000000000..2788dc9d5 --- /dev/null +++ b/fpga/usrp2/vrt/vita_rx_chain.v @@ -0,0 +1,114 @@ +// +// Copyright 2011-2012 Ettus Research LLC +// +// This program is free software: you can redistribute it and/or modify +// it under the terms of the GNU General Public License as published by +// the Free Software Foundation, either version 3 of the License, or +// (at your option) any later version. +// +// This program is distributed in the hope that it will be useful, +// but WITHOUT ANY WARRANTY; without even the implied warranty of +// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +// GNU General Public License for more details. +// +// You should have received a copy of the GNU General Public License +// along with this program. If not, see <http://www.gnu.org/licenses/>. +// + + +module vita_rx_chain + #(parameter BASE=0, + parameter UNIT=0, + parameter FIFOSIZE=10, + parameter PROT_ENG_FLAGS=1, + parameter DSP_NUMBER=0) + (input clk, input reset, + input set_stb, input [7:0] set_addr, input [31:0] set_data, + input set_stb_user, input [7:0] set_addr_user, input [31:0] set_data_user, + input [63:0] vita_time, + input [31:0] sample, input strobe, + output [35:0] rx_data_o, output rx_src_rdy_o, input rx_dst_rdy_i, + output overrun, output run, output clear_o, + output [31:0] debug ); + + wire [100:0] sample_data; + wire sample_dst_rdy, sample_src_rdy; + wire [31:0] vrc_debug, vrf_debug; + + wire [35:0] rx_data_int; + wire rx_src_rdy_int, rx_dst_rdy_int; + + wire clear; + assign clear_o = clear; + wire clear_int; + setting_reg #(.my_addr(BASE+8)) sr + (.clk(clk),.rst(reset),.strobe(set_stb),.addr(set_addr), + .in(set_data),.out(),.changed(clear_int)); + + vita_rx_control #(.BASE(BASE), .WIDTH(32)) vita_rx_control + (.clk(clk), .reset(reset), .clear(clear), + .set_stb(set_stb),.set_addr(set_addr),.set_data(set_data), + .vita_time(vita_time), .overrun(overrun), + .sample(sample), .run(run), .strobe(strobe), + .sample_fifo_o(sample_data), .sample_fifo_dst_rdy_i(sample_dst_rdy), .sample_fifo_src_rdy_o(sample_src_rdy), + .debug_rx(vrc_debug)); + + vita_rx_framer #(.BASE(BASE), .MAXCHAN(1)) vita_rx_framer + (.clk(clk), .reset(reset), .clear(clear), + .set_stb(set_stb),.set_addr(set_addr),.set_data(set_data), + .sample_fifo_i(sample_data), .sample_fifo_dst_rdy_o(sample_dst_rdy), .sample_fifo_src_rdy_i(sample_src_rdy), + .data_o(rx_data_int), .src_rdy_o(rx_src_rdy_int), .dst_rdy_i(rx_dst_rdy_int), + .debug_rx(vrf_debug) ); + + wire [FIFOSIZE-1:0] access_adr, access_len; + wire access_we, access_stb, access_ok, access_done, access_skip_read; + wire [35:0] dsp_to_buf, buf_to_dsp; + wire [35:0] rx_data_int2; + wire rx_src_rdy_int2, rx_dst_rdy_int2; + + double_buffer #(.BUF_SIZE(FIFOSIZE)) db + (.clk(clk),.reset(reset),.clear(clear), + .access_we(access_we), .access_stb(access_stb), .access_ok(access_ok), .access_done(access_done), + .access_skip_read(access_skip_read), .access_adr(access_adr), .access_len(access_len), + .access_dat_i(dsp_to_buf), .access_dat_o(buf_to_dsp), + + .data_i(rx_data_int), .src_rdy_i(rx_src_rdy_int), .dst_rdy_o(rx_dst_rdy_int), + .data_o(rx_data_int2), .src_rdy_o(rx_src_rdy_int2), .dst_rdy_i(rx_dst_rdy_int2)); + + vita_rx_engine_glue #(.DSPNO(DSP_NUMBER), .MAIN_SETTINGS_BASE(BASE+3), .BUF_SIZE(FIFOSIZE)) dspengine_rx + (.clock(clk),.reset(reset),.clear(clear), + .set_stb_main(set_stb), .set_addr_main(set_addr), .set_data_main(set_data), + .set_stb_user(set_stb_user), .set_addr_user(set_addr_user), .set_data_user(set_data_user), + .access_we(access_we), .access_stb(access_stb), .access_ok(access_ok), .access_done(access_done), + .access_skip_read(access_skip_read), .access_adr(access_adr), .access_len(access_len), + .access_dat_i(buf_to_dsp), .access_dat_o(dsp_to_buf)); + + add_routing_header #(.PORT_SEL(UNIT), + .PROT_ENG_FLAGS(PROT_ENG_FLAGS)) dsp_routing_header + (.clk(clk), .reset(reset), .clear(clear), + .data_i(rx_data_int2), .src_rdy_i(rx_src_rdy_int2), .dst_rdy_o(rx_dst_rdy_int2), + .data_o(rx_data_o), .src_rdy_o(rx_src_rdy_o), .dst_rdy_i(rx_dst_rdy_i) ); + + //only clear once a full packet has passed through the output interface + reg xfer_pkt, clear_oneshot; + assign clear = (clear_oneshot)? ~xfer_pkt : 0; + always @(posedge clk) begin + + if (reset || clear) begin + clear_oneshot <= 0; + end + else if (clear_int) begin + clear_oneshot <= 1; + end + + if (reset || clear) begin + xfer_pkt <= 0; + end + else if (rx_src_rdy_o && rx_dst_rdy_i) begin + xfer_pkt <= ~rx_data_o[33]; + end + end + + assign debug = vrc_debug; // | vrf_debug; + +endmodule // vita_rx_chain |