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CS fixes

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This commit is contained in:
Zane Kaminski 2023-04-08 05:46:53 -04:00
parent c3afb1147b
commit 08c0e74b80
1 changed files with 5 additions and 4 deletions
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9
cpld/CS.v
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@ -26,7 +26,7 @@ module CS(
/* RAM select signals */
assign RAMCS0X = A[23:22]==2'b00;
assign RAMCS = RAMCS0X && !Overlay;
wire VidRAMCSWR64k = RAMCS && !nWE && (A[23:20]==4'h3) && (A[19:16]==4'hF); // 3F0000-3FFFFF
wire VidRAMCSWR64k = RAMCS0X && !nWE && (A[23:20]==4'h3) && (A[19:16]==4'hF); // 3F0000-3FFFFF
wire VidRAMCSWR = VidRAMCSWR64k && (
(A[15:12]==4'h2 && // 1792 bytes RAM, 2304 bytes video
(A[11:8]==4'h7 ||
@ -55,7 +55,7 @@ module CS(
A[11:8]==4'h9 ||
A[11:8]==4'hA ||
A[11:8]==4'hB ||
(A[11:8]==4'hC && !A[7]))) ||
A[11:8]==4'hC)) ||
(A[15:12]==4'hA && // 256 bytes RAM, 768 bytes sound, 768 bytes RAM, 2304 bytes video
(A[11:8]==4'h1 ||
A[11:8]==4'h2 ||
@ -71,6 +71,7 @@ module CS(
A[11:8]==4'hF)) ||
(A[15:12]==4'hB) || // 4096 bytes video
(A[15:12]==4'hC) || // 4096 bytes video
(A[15:12]==4'hD) || // 4096 bytes video
(A[15:12]==4'hE) || // 4096 bytes video
(A[15:12]==4'hF && // 3200 bytes video, 128 bytes RAM (system error space), 768 bytes sound
(A[11:8]==4'h0 ||
@ -85,10 +86,10 @@ module CS(
A[11:8]==4'h9 ||
A[11:8]==4'hA ||
A[11:8]==4'hB ||
(A[11:8]==4'hC && !A[7]) ||
A[11:8]==4'hC ||
A[11:8]==4'hD ||
A[11:8]==4'hE ||
A[11:8]==4'hF));
A[11:8]==4'hF)));
assign SndRAMCSWR = VidRAMCSWR64k && (
((A[15:12]==4'hF) && ((A[11:8]==4'hD) || (A[11:8]==4'hE) || (A[11:8]==4'hF))) ||
((A[15:12]==4'hA) && ((A[11:8]==4'h1) || (A[11:8]==4'h2) || (A[11:8]==4'h3))));