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-rw-r--r--usrp2/gpmc/fifo_watcher.v73
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diff --git a/usrp2/gpmc/fifo_watcher.v b/usrp2/gpmc/fifo_watcher.v
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--- a/usrp2/gpmc/fifo_watcher.v
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-//
-// Copyright 2011 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 fifo_watcher
- (input clk, input reset, input clear,
- input src_rdy1, input dst_rdy1, input sof1, input eof1,
- input src_rdy2, input dst_rdy2, input sof2, input eof2,
- output reg have_packet, output [15:0] length, output reg bus_error,
- output [31:0] debug);
-
- wire write = src_rdy1 & dst_rdy1 & eof1;
- wire read = src_rdy2 & dst_rdy2 & eof2;
- wire have_packet_int;
- reg [15:0] counter;
- wire [4:0] pkt_count;
- assign debug = pkt_count;
-
- fifo_short #(.WIDTH(16)) frame_lengths
- (.clk(clk), .reset(reset), .clear(clear),
- .datain(counter), .src_rdy_i(write), .dst_rdy_o(),
- .dataout(length), .src_rdy_o(have_packet_int), .dst_rdy_i(read),
- .occupied(pkt_count), .space());
-
- always @(posedge clk)
- if(reset | clear)
- counter <= 1; // Start at 1
- else if(src_rdy1 & dst_rdy1)
- if(eof1)
- counter <= 1;
- else
- counter <= counter + 1;
-
- always @(posedge clk)
- if(reset | clear)
- bus_error <= 0;
- else if(dst_rdy2 & ~src_rdy2)
- bus_error <= 1;
- else if(read & ~have_packet_int)
- bus_error <= 1;
-
- reg in_packet;
- always @(posedge clk)
- if(reset | clear)
- have_packet <= 0;
- else
- have_packet <= (have_packet_int & ~in_packet) | (pkt_count>1) ;
-
- always @(posedge clk)
- if(reset | clear)
- in_packet <= 0;
- else if(src_rdy2 & dst_rdy2)
- if(eof2)
- in_packet <= 0;
- else
- in_packet <= 1;
-
-endmodule // fifo_watcher