/* Wrappers for the different CPU types */
static CPU_INIT( v20 )
{
nec_state_t *nec_state = get_safe_token(device);
nec_init(device, irqcallback);
nec_state->fetch_xor = 0;
nec_state->chip_type=V20_TYPE;
nec_state->prefetch_size = 4; /* 3 words */
nec_state->prefetch_cycles = 4; /* four cycles per byte */
}
static CPU_INIT( v30 )
{
nec_state_t *nec_state = get_safe_token(device);
nec_init(device, irqcallback);
nec_state->fetch_xor = BYTE_XOR_LE(0);
nec_state->chip_type=V30_TYPE;
nec_state->prefetch_size = 6; /* 3 words */
nec_state->prefetch_cycles = 2; /* two cycles per byte / four per word */
}
static CPU_INIT( v33 )
{
nec_state_t *nec_state = get_safe_token(device);
nec_init(device, irqcallback);
nec_state->chip_type=V33_TYPE;
nec_state->prefetch_size = 6;
/* FIXME: Need information about prefetch size and cycles for V33.
* complete guess below, nbbatman will not work
* properly without. */
nec_state->prefetch_cycles = 1; /* two cycles per byte / four per word */
nec_state->fetch_xor = BYTE_XOR_LE(0);
}
void necInit(int cpu, int type)
{
nec_state_t *nec_state = &sChips[cpu];
nec_init(cpu);
switch (type)
{
case V20_TYPE:
{
nec_state->fetch_xor = 0;
nec_state->chip_type=V20_TYPE;
nec_state->prefetch_size = 4; /* 3 words */
nec_state->prefetch_cycles = 4; /* four cycles per byte */
}
break;
case V30_TYPE:
{
nec_state->fetch_xor = 0;
nec_state->chip_type=V30_TYPE;
nec_state->prefetch_size = 6; /* 3 words */
nec_state->prefetch_cycles = 2; /* two cycles per byte / four per word */
}
break;
case V33_TYPE:
{
nec_state->fetch_xor = 0;
nec_state->chip_type=V33_TYPE;
nec_state->prefetch_size = 6;
/* FIXME: Need information about prefetch size and cycles for V33.
* complete guess below, nbbatman will not work
* properly without. */
nec_state->prefetch_cycles = 1; /* two cycles per byte / four per word */
}
break;
}
}
