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//
// 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());
setting_reg #(.my_addr(BASE+8),.width(4), .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_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-4'd1))
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-4'd1)) &
~|flags_fifo_o[4:1]) |
(vita_state==VITA_ERR_PAYLOAD));
assign debug_rx = vita_state;
endmodule // vita_rx_framer
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