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[Core/CD] improved MAIN-CPU/SUB-CPU synchronization when reading CDC host data and CDC transfer status from MAIN-CPU (fixes MCD-verificator CDC INIT Test #4 and CDC DMA3 Test #2)

This commit is contained in:
ekeeke 2023-11-19 16:18:38 +01:00
parent 6669d25948
commit b330eb85cf
4 changed files with 13 additions and 0 deletions
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13
core/mem68k.c
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@ -368,6 +368,14 @@ unsigned int ctrl_io_read_byte(unsigned int address)
return scd.regs[0x03>>1].byte.l & 0xc7;
}
/* CDC Mode */
if (index == 0x04)
{
/* sync SUB-CPU with MAIN-CPU (fixes MCD-verificator CDC DMA3 Test #2) */
s68k_sync();
return scd.regs[0x04>>1].byte.h & 0xc7;
}
/* SUB-CPU communication flags */
if (index == 0x0f)
{
@ -514,6 +522,11 @@ unsigned int ctrl_io_read_word(unsigned int address)
/* CDC host data (word access only ?) */
if (index == 0x08)
{
/* sync SUB-CPU with MAIN-CPU if CDC data transfer is not yet enabled (fixes MCD-verificator CDC INIT Test #4) */
if (!(scd.regs[0x04>>1].byte.h & 0x40))
{
s68k_sync();
}
return cdc_host_r();
}