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Better addressing

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This commit is contained in:
Zane Kaminski 2023-04-02 00:26:06 -04:00
parent 0e43923ff0
commit d113d31c83
1 changed files with 14 additions and 12 deletions
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26
cpld/RAM.v
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@ -72,18 +72,20 @@ module RAM(
assign nROMWE = !(~nAS && ~nWE); assign nROMWE = !(~nAS && ~nWE);
/* RAM address mux (and ROM address on RA8) */ /* RAM address mux (and ROM address on RA8) */
assign RA[11] = RAMCS ? (RASEL ? A[04] : A[13]) : A[19]; assign RA[11] = ROMCS ? A[19] : !RASEL ? A[21] : A[20];
assign RA[10] = RASEL ? A[03] : A[21]; assign RA[03] = !RASEL ? A[21] : A[20];
assign RA[09] = RASEL ? A[20] : A[19];
assign RA[08] = (RASEL && RAMCS) ? A[09] : A[18]; assign RA[10] = !RASEL ? A[19] : A[17];
assign RA[07] = RASEL ? A[08] : A[17]; assign RA[02] = !RASEL ? A[18] : A[17];
assign RA[06] = RASEL ? A[07] : A[16];
assign RA[05] = RASEL ? A[06] : A[15]; assign RA[09] = !RASEL ? A[16] : A[08];
assign RA[04] = RASEL ? A[05] : A[14]; assign RA[08] = ROMCS ? A[18] : !RASEL ? A[15] : A[07];
assign RA[03] = RASEL ? A[04] : A[13]; assign RA[07] = !RASEL ? A[14] : A[06];
assign RA[02] = RASEL ? A[03] : A[12]; assign RA[06] = !RASEL ? A[13] : A[05];
assign RA[01] = RASEL ? A[02] : A[11]; assign RA[05] = !RASEL ? A[12] : A[04];
assign RA[00] = RASEL ? A[01] : A[10]; assign RA[04] = !RASEL ? A[11] : A[03];
assign RA[01] = !RASEL ? A[10] : A[02];
assign RA[00] = !RASEL ? A[09] : A[01];
always @(posedge CLK) begin always @(posedge CLK) begin
if (RS==0) begin if (RS==0) begin