From 547e1e692345e0f3e38e16805141fb0bc3d20690 Mon Sep 17 00:00:00 2001 From: Matt Ettus Date: Thu, 15 Jul 2010 16:45:50 -0700 Subject: split fifo into 2 streams based on first line in each packet --- usrp2/fifo/fifo36_demux.v | 50 +++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 50 insertions(+) create mode 100644 usrp2/fifo/fifo36_demux.v (limited to 'usrp2/fifo/fifo36_demux.v') diff --git a/usrp2/fifo/fifo36_demux.v b/usrp2/fifo/fifo36_demux.v new file mode 100644 index 000000000..a54759d4d --- /dev/null +++ b/usrp2/fifo/fifo36_demux.v @@ -0,0 +1,50 @@ + +// Demux packets from a fifo based on the contents of the first line +// If first line matches the parameter and mask, send to data1, otherwise send to data0 + +module fifo36_demux + #(parameter match_data = 0, + parameter match_mask = 0) + (input clk, input reset, input clear, + input [35:0] data_i, input src_rdy_i, output dst_rdy_o, + output [35:0] data0_o, output src0_rdy_o, input dst0_rdy_i, + output [35:0] data1_o, output src1_rdy_o, input dst1_rdy_i); + + localparam DMX_IDLE = 0; + localparam DMX_DATA0 = 1; + localparam DMX_DATA1 = 2; + + reg [1:0] state; + + wire match = |( (data_i ^ match_data) & match_mask ); + wire eof = data_i[33]; + + always @(posedge clk) + if(reset | clear) + state <= DMX_IDLE; + else + case(state) + DMX_IDLE : + if(src_rdy_i) + if(match) + state <= DMX_DATA1; + else + state <= DMX_DATA0; + DMX_DATA0 : + if(src_rdy_i & dst0_rdy_i & eof) + state <= DMX_IDLE; + DMX_DATA1 : + if(src_rdy_i & dst1_rdy_i & eof) + state <= DMX_IDLE; + default : + state <= DMX_IDLE; + endcase // case (state) + + assign dst_rdy_o = (state==DMX_IDLE) ? 0 : (state==DMX_DATA0) ? dst0_rdy_i : dst1_rdy_i; + assign src0_rdy_o = (state==DMX_DATA0) ? src_rdy_i : 0; + assign src1_rdy_o = (state==DMX_DATA1) ? src_rdy_i : 0; + + assign data0_o = data_i; + assign data1_o = data_i; + +endmodule // fifo36_demux -- cgit v1.2.3