diff options
Diffstat (limited to 'fpga/usrp2/fifo/fifo36_to_fifo19.v')
| -rw-r--r-- | fpga/usrp2/fifo/fifo36_to_fifo19.v | 48 |
1 files changed, 33 insertions, 15 deletions
diff --git a/fpga/usrp2/fifo/fifo36_to_fifo19.v b/fpga/usrp2/fifo/fifo36_to_fifo19.v index e016fe2c6..0e9b2d442 100644 --- a/fpga/usrp2/fifo/fifo36_to_fifo19.v +++ b/fpga/usrp2/fifo/fifo36_to_fifo19.v @@ -13,25 +13,37 @@ module fifo36_to_fifo19 output [18:0] f19_dataout, output f19_src_rdy_o, input f19_dst_rdy_i ); - - wire f36_sof = f36_datain[32]; - wire f36_eof = f36_datain[33]; - wire [1:0] f36_occ = f36_datain[35:34]; + + wire [18:0] f19_data_int; + wire f19_src_rdy_int, f19_dst_rdy_int; + wire [35:0] f36_data_int; + wire f36_src_rdy_int, f36_dst_rdy_int; + + // Shortfifo on input to guarantee no deadlock + fifo_short #(.WIDTH(36)) head_fifo + (.clk(clk),.reset(reset),.clear(clear), + .datain(f36_datain), .src_rdy_i(f36_src_rdy_i), .dst_rdy_o(f36_dst_rdy_o), + .dataout(f36_data_int), .src_rdy_o(f36_src_rdy_int), .dst_rdy_i(f36_dst_rdy_int), + .space(),.occupied() ); + + // Main fifo36_to_fifo19, needs shortfifos to guarantee no deadlock + wire [1:0] f36_occ_int = f36_data_int[35:34]; + wire f36_sof_int = f36_data_int[32]; + wire f36_eof_int = f36_data_int[33]; reg phase; + wire half_line = f36_eof_int & ((f36_occ_int==1)|(f36_occ_int==2)); - wire half_line = f36_eof & ((f36_occ==1)|(f36_occ==2)); - - assign f19_dataout[15:0] = (LE ^ phase) ? f36_datain[15:0] : f36_datain[31:16]; - assign f19_dataout[16] = phase ? 0 : f36_sof; - assign f19_dataout[17] = phase ? f36_eof : half_line; - assign f19_dataout[18] = f19_dataout[17] & ((f36_occ==1)|(f36_occ==3)); + assign f19_data_int[15:0] = (LE ^ phase) ? f36_data_int[15:0] : f36_data_int[31:16]; + assign f19_data_int[16] = phase ? 0 : f36_sof_int; + assign f19_data_int[17] = phase ? f36_eof_int : half_line; + assign f19_data_int[18] = f19_data_int[17] & ((f36_occ_int==1)|(f36_occ_int==3)); - assign f19_src_rdy_o = f36_src_rdy_i; - assign f36_dst_rdy_o = (phase | half_line) & f19_dst_rdy_i; + assign f19_src_rdy_int = f36_src_rdy_int; + assign f36_dst_rdy_int = (phase | half_line) & f19_dst_rdy_int; - wire f19_xfer = f19_src_rdy_o & f19_dst_rdy_i; - wire f36_xfer = f36_src_rdy_i & f36_dst_rdy_o; + wire f19_xfer = f19_src_rdy_int & f19_dst_rdy_int; + wire f36_xfer = f36_src_rdy_int & f36_dst_rdy_int; always @(posedge clk) if(reset) @@ -41,5 +53,11 @@ module fifo36_to_fifo19 else if(f19_xfer) phase <= 1; - + // Shortfifo on output to guarantee no deadlock + fifo_short #(.WIDTH(19)) tail_fifo + (.clk(clk),.reset(reset),.clear(clear), + .datain(f19_data_int), .src_rdy_i(f19_src_rdy_int), .dst_rdy_o(f19_dst_rdy_int), + .dataout(f19_dataout), .src_rdy_o(f19_src_rdy_o), .dst_rdy_i(f19_dst_rdy_i), + .space(),.occupied() ); + endmodule // fifo36_to_fifo19 |