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// Parameter LE tells us if we are little-endian.
// Little-endian means send lower 16 bits first.
// Default is big endian (network order), send upper bits first.
module fifo36_to_fifo19
#(parameter LE=0)
(input clk, input reset, input clear,
input [35:0] f36_datain,
input f36_src_rdy_i,
output f36_dst_rdy_o,
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 f36_occ = f36_datain[35:34];
reg phase;
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_src_rdy_o = f36_src_rdy_i;
assign f36_dst_rdy_o = (phase | half_line) & f19_dst_rdy_i;
wire f19_xfer = f19_src_rdy_o & f19_dst_rdy_i;
wire f36_xfer = f36_src_rdy_i & f36_dst_rdy_o;
always @(posedge clk)
if(reset)
phase <= 0;
else if(f36_xfer)
phase <= 0;
else if(f19_xfer)
phase <= 1;
endmodule // fifo36_to_fifo19
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