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Diffstat (limited to 'fpga/usrp3/lib/control/binary_encoder.v')
| -rw-r--r-- | fpga/usrp3/lib/control/binary_encoder.v | 42 |
1 files changed, 42 insertions, 0 deletions
diff --git a/fpga/usrp3/lib/control/binary_encoder.v b/fpga/usrp3/lib/control/binary_encoder.v new file mode 100644 index 000000000..e13a8174b --- /dev/null +++ b/fpga/usrp3/lib/control/binary_encoder.v @@ -0,0 +1,42 @@ + +`define LOG2(N) (\ + N < 2 ? 0 : \ + N < 4 ? 1 : \ + N < 8 ? 2 : \ + N < 16 ? 3 : \ + N < 32 ? 4 : \ + N < 64 ? 5 : \ + N < 128 ? 6 : \ + N < 256 ? 7 : \ + N < 512 ? 8 : \ + N < 1024 ? 9 : \ + 10) + + module binary_encoder + #( + parameter SIZE = 16 + ) + ( + input [SIZE-1:0] in, + output [`LOG2(SIZE)-1:0] out + ); + + genvar m,n; + + generate + // Loop enough times to represent the total number of input bits as an encoded value + for (m = 0; m <= `log2(SIZE-1); m = m + 1) begin: expand_or_tree + wire [SIZE-1:0] encoding; + // Build enable mask by iterating through every input bit. + for (n = 0; n < SIZE ; n = n + 1) begin: encode_this_bit + assign encoding[n] = n[m]; + end + // OR tree for this output bit with appropraite bits enabled. + assign out[m] = |(encoding & in); + end + endgenerate +endmodule // binary_encoder + + + +
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