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Diffstat (limited to 'fpga/usrp2/vrt/vita_rx_framer.v')
| -rw-r--r-- | fpga/usrp2/vrt/vita_rx_framer.v | 224 |
1 files changed, 224 insertions, 0 deletions
diff --git a/fpga/usrp2/vrt/vita_rx_framer.v b/fpga/usrp2/vrt/vita_rx_framer.v new file mode 100644 index 000000000..6e4b8025d --- /dev/null +++ b/fpga/usrp2/vrt/vita_rx_framer.v @@ -0,0 +1,224 @@ +// +// 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_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 [5+64+(32*MAXCHAN)-1:0] sample_fifo_i, + input sample_fifo_src_rdy_i, + output sample_fifo_dst_rdy_o, + + output [31:0] debug_rx + ); + + localparam SAMP_WIDTH = 5+64+(32*MAXCHAN); + reg [3:0] sample_phase; + wire [3:0] numchan; + wire [4:0] flags_fifo_o = sample_fifo_i[SAMP_WIDTH-1:SAMP_WIDTH-5]; + wire [63:0] vita_time_fifo_o = sample_fifo_i[SAMP_WIDTH-6:SAMP_WIDTH-69]; + + 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 [4:0] flags = {signal_zerolen,signal_overrun,signal_brokenchain,signal_latecmd,signal_cmd_done}; + + 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),.width(16)) sr_samples_per_pkt + (.clk(clk),.rst(reset),.strobe(set_stb),.addr(set_addr), + .in(set_data),.out(samples_per_packet),.changed()); + + assign numchan = 0;/* + setting_reg #(.my_addr(BASE+8),.width(4), .at_reset(0)) 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_TICS = 3; + localparam VITA_TICS2 = 4; + localparam VITA_PAYLOAD = 5; + localparam VITA_TRAILER = 6; + localparam VITA_ERR_HEADER = 7; // All ERR at 4'b1000 or'ed with base + localparam VITA_ERR_STREAMID = 8; + localparam VITA_ERR_TICS = 9; + localparam VITA_ERR_TICS2 = 10; + localparam VITA_ERR_PAYLOAD = 11; + localparam VITA_ERR_TRAILER = 12; // Extension context packets have no trailer + + always @(posedge clk) + if(reset | clear | clear_pkt_count) + pkt_count <= 0; + else if((vita_state == VITA_TRAILER) & pkt_fifo_rdy) + pkt_count <= pkt_count + 1; + + wire has_streamid = vita_header[28]; + wire has_trailer = vita_header[26]; + reg trl_eob; + + always @* + case(vita_state) + // Data packets are IF Data packets with or w/o streamid, no classid, with trailer + VITA_HEADER : pkt_fifo_line <= {2'b01,3'b000,vita_header[28],2'b01,vita_header[25:24], + vita_header[23:20],pkt_count[3:0],vita_pkt_len[15:0]}; + VITA_STREAMID : pkt_fifo_line <= {2'b00,vita_streamid}; + VITA_TICS : pkt_fifo_line <= {2'b00,vita_time_fifo_o[63:32]}; + VITA_TICS2 : pkt_fifo_line <= {2'b00,vita_time_fifo_o[31:0]}; + VITA_PAYLOAD : pkt_fifo_line <= {2'b00,data_fifo_o}; + VITA_TRAILER : pkt_fifo_line <= {2'b10,vita_trailer[31:21],1'b1,vita_trailer[19:9],trl_eob,8'd0}; + + // Error packets are Extension Context packets, which have no trailer + VITA_ERR_HEADER : pkt_fifo_line <= {2'b01,4'b0101,4'b0000,vita_header[23:20],pkt_count,16'd5}; + VITA_ERR_STREAMID : pkt_fifo_line <= {2'b00,vita_streamid}; + VITA_ERR_TICS : pkt_fifo_line <= {2'b00,vita_time_fifo_o[63:32]}; + VITA_ERR_TICS2 : pkt_fifo_line <= {2'b00,vita_time_fifo_o[31:0]}; + VITA_ERR_PAYLOAD : pkt_fifo_line <= {2'b10,27'd0,flags_fifo_o}; + //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 | clear) + 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[4:1]) + vita_state <= VITA_ERR_HEADER; + else + vita_state <= VITA_HEADER; + end + else if(pkt_fifo_rdy) + case(vita_state) + VITA_HEADER : + if(has_streamid) + vita_state <= VITA_STREAMID; + else + vita_state <= VITA_TICS; + VITA_PAYLOAD : + if(sample_fifo_src_rdy_i) + begin + if(sample_phase == numchan) + begin + sample_phase <= 0; + sample_ctr <= sample_ctr + 1; + trl_eob <= flags_fifo_o[0]; + 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 // if (sample_fifo_src_rdy_i) + VITA_ERR_PAYLOAD : + vita_state <= VITA_IDLE; + VITA_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_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[4:1]); + VITA_ERR_HEADER, VITA_ERR_STREAMID, VITA_ERR_TICS, VITA_ERR_TICS2, VITA_ERR_PAYLOAD : + 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), + .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() ); + + 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) & + ~|flags_fifo_o[4:1]) | + (vita_state==VITA_ERR_PAYLOAD)); + + assign debug_rx = vita_state; + +endmodule // vita_rx_framer |