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Temporary change to mmu/priority_encoder.sv

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Necessary to get synth working
Original HDL is still there, just commented out
This commit is contained in:
Teo Ene 2021-04-15 13:37:12 -05:00
parent 636e2de9df
commit ad86295fcf
1 changed files with 38 additions and 14 deletions
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52
wally-pipelined/src/mmu/priority_encoder.sv
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@ -27,24 +27,48 @@
`include "wally-config.vh" `include "wally-config.vh"
// Teo Ene 04/15:
// Temporarily removed paramterized priority encoder for non-parameterized one
// To get synthesis working quickly
// *** We should look for a better parameterized priority encoder. This has a // *** We should look for a better parameterized priority encoder. This has a
// bad code smell and might not synthesize // bad code smell and might not synthesize
//module priority_encoder #(parameter BINARY_BITS = 3) (
// input [(2**BINARY_BITS)-1:0] one_hot,
// output [BINARY_BITS-1:0] binary
//);
//
// localparam ONE_HOT_BITS = 2**BINARY_BITS;
//
// genvar i, j;
// generate
// for (i = 0; i < ONE_HOT_BITS; i++) begin
// for (j = 0; j < BINARY_BITS; j++) begin
// if (i[j]) begin
// assign binary[j] = one_hot[i];
// end
// end
// end
// endgenerate
//
//endmodule
module priority_encoder #(parameter BINARY_BITS = 3) ( module priority_encoder #(parameter BINARY_BITS = 3) (
input [(2**BINARY_BITS)-1:0] one_hot, input logic [7:0] one_hot,
output [BINARY_BITS-1:0] binary output logic [2:0] binary
); );
localparam ONE_HOT_BITS = 2**BINARY_BITS; always_comb
case (one_hot)
genvar i, j; 8'h1: binary=3'h0;
generate 8'h2: binary=3'h1;
for (i = 0; i < ONE_HOT_BITS; i++) begin 8'h4: binary=3'h2;
for (j = 0; j < BINARY_BITS; j++) begin 8'h8: binary=3'h3;
if (i[j]) begin 8'h10: binary=3'h4;
assign binary[j] = one_hot[i]; 8'h20: binary=3'h5;
end 8'h40: binary=3'h6;
end 8'h80: binary=3'h7;
end default: binary=3'h0; //should never happen
endgenerate endcase
endmodule endmodule