Macintosh-HW/Warp-SE
1
0
Fork 0
mirror of https://github.com/garrettsworkshop/Warp-SE.git synced 2025-04-11 08:37:05 +00:00
Code Issues Projects Releases Wiki Activity

Clock always gated during sound slowdown but immediately resumes 25 MHz after

Browse Source
This commit is contained in:
Zane Kaminski 2024-10-13 17:55:19 -04:00
parent 9718db0ebd
commit 789ed488c3
1 changed files with 10 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

11
cpld/CNT.v
View File

@ -98,11 +98,20 @@ module CNT(
/* QoS enable control */
always @(posedge CLK) if (!BACT) QoSEN <= QS!=0 || SlowTimeout==0;
/* Was last slowdown trigger from sound? */
reg LastWasSound;
always @(posedge CLK) begin
if (QoSCSr) LastWasSound <= 0;
else if (SndQoSCSr) LastWasSound <= 1;
end
/* MC68k clock gating during QoS */
always @(negedge CLK, negedge nAS) begin
if (!nAS) MCKE <= 1;
else MCKE <= ASrf || !QoSEN || C8MFall || !SlowClockGate;
else MCKE <= SlowClockGate ?
!(QoSEN && !ASrf && !C8MFall) :
!(QoSEN && !ASrf && !C8MFall && LastWasSound);
end
/* Long timer counts from 0 to 4095.