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Register /DTACK at C16M clock edge instead

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This commit is contained in:
Zane Kaminski 2024-10-07 06:09:25 -04:00
parent b240a054f2
commit d14ca62644
1 changed files with 7 additions and 12 deletions
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19
cpld/IOBM.v
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@ -39,22 +39,17 @@ module IOBM(
/* I/O bus state */ /* I/O bus state */
reg [2:0] IOS = 0; reg [2:0] IOS = 0;
reg IOS0; reg IOS0;
/* Cycle termination signal enable */ /* DTACK/"ETACK"/BERR/reset synchronization */
reg TermEN;
always @(posedge C16M) begin
TermEN <= IOS==2 || IOS==3 || IOS==4 || IOS==5;
end
/* DTACK/"ETACK"/BERR/reset falling edge synchronization */
reg IODONEr; reg IODONEr;
always @(negedge C8M, posedge nAS) begin always @(posedge C16M) begin
if (nAS) IODONEr <= 0; if ((IOS==3 || IOS==5) && !C8Mr) begin
else IODONEr <= TermEN && (!nDTACK || ETACK || !nBERR || !nRES); IODONEr <= !nDTACK || ETACK || !nBERR || !nRES;
end else if (IOS==0) IODONEr <= 0;
end end
/* DTACK/"ETACK"/BERR/reset output */ /* DTACK/"ETACK"/BERR/reset output */
assign IODONE = IODONEr && TermEN; assign IODONE = IODONEr;
/* I/O bus control */ /* I/O bus control */
always @(posedge C16M) case (IOS[2:0]) always @(posedge C16M) case (IOS[2:0])