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Removed unused logic in icache.

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This commit is contained in:
Ross Thompson 2021-08-26 10:49:54 -05:00
parent 642efbb563
commit c83f0a2e99
1 changed files with 0 additions and 15 deletions
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15
wally-pipelined/src/cache/ICacheCntrl.sv vendored
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@ -150,7 +150,6 @@ module ICacheCntrl #(parameter BLOCKLEN = 256)
localparam [31:0] NOP = 32'h13;
logic reset_q;
logic [1:0] PCMux_q;
@ -455,19 +454,5 @@ module ICacheCntrl #(parameter BLOCKLEN = 256)
.d(PCPreFinalF[1]),
.q(PCPreFinalF_q[1]));
assign FinalInstrRawF = spill ? {ICacheMemReadData[15:0], SpillDataBlock0} : ICacheMemReadData;
// There is a frustrating issue on the first access.
// The cache will not contain any valid data but will contain x's on
// reset. This makes FinalInstrRawF invalid. On the first cycle out of
// reset this register will pickup this x and it will propagate throughout
// the cpu causing simulation failure, most likely a trap for invalid instruction.
// Reset must be held 1 cycle longer to prevent this issue. additionally the
// reset should be to a NOP rather than 0.
// register reset
flop #(1) resetReg (.clk(clk),
.d(reset),
.q(reset_q));
endmodule