void c2040_fdc_t::live_run(const attotime &limit)
{
if(cur_live.state == IDLE || cur_live.next_state != -1)
return;
for(;;) {
switch(cur_live.state) {
case RUNNING: {
bool syncpoint = false;
if (cur_live.tm > limit)
return;
int bit = get_next_bit(cur_live.tm, limit);
if(bit < 0)
return;
int cell_counter = cur_live.cell_counter;
if (bit) {
cur_live.cycle_counter = cur_live.ds;
cur_live.cell_counter = 0;
} else {
cur_live.cycle_counter++;
}
if (cur_live.cycle_counter == 16) {
cur_live.cycle_counter = cur_live.ds;
cur_live.cell_counter++;
cur_live.cell_counter &= 0xf;
}
if (!BIT(cell_counter, 1) && BIT(cur_live.cell_counter, 1)) {
// read bit
cur_live.shift_reg <<= 1;
cur_live.shift_reg |= !(BIT(cur_live.cell_counter, 3) || BIT(cur_live.cell_counter, 2));
cur_live.shift_reg &= 0x3ff;
if (LOG) logerror("%s read bit %u (%u) >> %03x, rw=%u mode=%u\n", cur_live.tm.as_string(), cur_live.bit_counter,
!(BIT(cur_live.cell_counter, 3) || BIT(cur_live.cell_counter, 2)), cur_live.shift_reg, cur_live.rw_sel, cur_live.mode_sel);
// write bit
if (!cur_live.rw_sel) { // TODO WPS
write_next_bit(BIT(cur_live.shift_reg_write, 9), limit);
}
syncpoint = true;
}
int sync = !((cur_live.shift_reg == 0x3ff) && cur_live.rw_sel);
if (!sync) {
cur_live.bit_counter = 0;
} else if (!BIT(cell_counter, 1) && BIT(cur_live.cell_counter, 1) && cur_live.sync) {
cur_live.bit_counter++;
if (cur_live.bit_counter == 10) {
cur_live.bit_counter = 0;
}
}
// update GCR
if (cur_live.rw_sel) {
cur_live.i = (cur_live.rw_sel << 10) | cur_live.shift_reg;
} else {
cur_live.i = (cur_live.rw_sel << 10) | ((cur_live.pi & 0xf0) << 1) | (cur_live.mode_sel << 4) | (cur_live.pi & 0x0f);
}
cur_live.e = m_gcr_rom->base()[cur_live.i];
int ready = !(BIT(cell_counter, 1) && !BIT(cur_live.cell_counter, 1) && (cur_live.bit_counter == 9));
if (!ready) {
// load write shift register
cur_live.shift_reg_write = GCR_ENCODE(cur_live.e, cur_live.i);
if (LOG) logerror("%s load write shift register %03x\n",cur_live.tm.as_string(),cur_live.shift_reg_write);
} else if (BIT(cell_counter, 1) && !BIT(cur_live.cell_counter, 1)) {
// clock write shift register
cur_live.shift_reg_write <<= 1;
cur_live.shift_reg_write &= 0x3ff;
if (LOG) logerror("%s write shift << %03x\n",cur_live.tm.as_string(),cur_live.shift_reg_write);
}
int error = !(BIT(cur_live.e, 3) || ready);
if (ready != cur_live.ready) {
if (LOG) logerror("%s READY %u\n", cur_live.tm.as_string(),ready);
cur_live.ready = ready;
syncpoint = true;
}
if (sync != cur_live.sync) {
if (LOG) logerror("%s SYNC %u\n", cur_live.tm.as_string(),sync);
cur_live.sync = sync;
syncpoint = true;
}
if (error != cur_live.error) {
cur_live.error = error;
syncpoint = true;
}
if (syncpoint) {
commit(cur_live.tm);
cur_live.tm += m_period;
live_delay(RUNNING_SYNCPOINT);
return;
}
cur_live.tm += m_period;
break;
}
case RUNNING_SYNCPOINT: {
m_write_ready(cur_live.ready);
m_write_sync(cur_live.sync);
m_write_error(cur_live.error);
cur_live.state = RUNNING;
checkpoint();
break;
}
}
}
}
void c8050_fdc_t::live_run(const attotime &limit)
{
if(cur_live.state == IDLE || cur_live.next_state != -1)
return;
for(;;) {
switch(cur_live.state) {
case RUNNING: {
bool syncpoint = false;
if (cur_live.tm > limit)
return;
// read bit
int bit = 0;
if (cur_live.rw_sel) {
bit = pll_get_next_bit(cur_live.tm, get_floppy(), limit);
if(bit < 0)
return;
}
// write bit
int write_bit = BIT(cur_live.shift_reg_write, 9);
if (!cur_live.rw_sel) { // TODO WPS
/*
write precompensation
UA5.A = UM6.Qc
UA5.B = !(!(!BRDY && UM6.Qa) && !(BRDY && E7))
UA5.C0 = UA4.Qb = bit clock delayed 333ns
UA5.C1 = UA4.Qa = bit clock delayed 166ns
UA5.C2 = UA4.Qc = bit clock delayed 499ns
UA5.C3 = UA5.Qb = bit clock delayed 333ns
DATA OUT = !(!BITCLK || !(UA5.Y && !(WRITE_ENABLE && !UM6.Qb)))
*/
if (pll_write_next_bit(write_bit, cur_live.tm, get_floppy(), limit))
return;
}
// clock read shift register
cur_live.shift_reg <<= 1;
cur_live.shift_reg |= bit;
cur_live.shift_reg &= 0x3ff;
// sync
int sync = !((cur_live.shift_reg == 0x3ff) && cur_live.rw_sel);
// bit counter
if (!sync) {
cur_live.bit_counter = 0;
} else if (cur_live.sync) {
cur_live.bit_counter++;
if (cur_live.bit_counter == 10) {
cur_live.bit_counter = 0;
}
}
// GCR decoder
if (cur_live.rw_sel) {
cur_live.i = (cur_live.rw_sel << 10) | cur_live.shift_reg;
} else {
cur_live.i = (cur_live.rw_sel << 10) | ((cur_live.pi & 0xf0) << 1) | (cur_live.mode_sel << 4) | (cur_live.pi & 0x0f);
}
cur_live.e = m_gcr_rom->base()[cur_live.i];
// byte ready
int ready = !(cur_live.bit_counter == 9); // 74190 _RC, should be triggered on the falling edge of the clock
int brdy = ready; // 74190 TC
// GCR error
int error = !(ready || BIT(cur_live.e, 3));
if (LOG_BITS) {
if (cur_live.rw_sel) {
logerror("%s cyl %u bit %u sync %u bc %u sr %03x i %03x e %02x\n",cur_live.tm.as_string(),get_floppy()->get_cyl(),bit,sync,cur_live.bit_counter,cur_live.shift_reg,cur_live.i,cur_live.e);
} else {
logerror("%s cyl %u writing bit %u bc %u sr %03x i %03x e %02x\n",cur_live.tm.as_string(),get_floppy()->get_cyl(),write_bit,cur_live.bit_counter,cur_live.shift_reg_write,cur_live.i,cur_live.e);
}
}
if (!ready) {
// load write shift register
cur_live.shift_reg_write = GCR_ENCODE(cur_live.e, cur_live.i);
if (LOG_BITS) logerror("%s load write shift register %03x\n",cur_live.tm.as_string(),cur_live.shift_reg_write);
} else {
// clock write shift register
cur_live.shift_reg_write <<= 1;
cur_live.shift_reg_write &= 0x3ff;
}
if (ready != cur_live.ready) {
if (cur_live.rw_sel && !ready)
if (LOG) logerror("%s READY %u : %02x\n", cur_live.tm.as_string(),ready,GCR_DECODE(cur_live.e, cur_live.i));
cur_live.ready = ready;
syncpoint = true;
}
if (brdy != cur_live.brdy) {
if (LOG_MORE) logerror("%s BRDY %u\n", cur_live.tm.as_string(), brdy);
cur_live.brdy = brdy;
syncpoint = true;
}
if (sync != cur_live.sync) {
if (LOG) logerror("%s SYNC %u\n", cur_live.tm.as_string(), sync);
cur_live.sync = sync;
syncpoint = true;
}
if (error != cur_live.error) {
if (LOG_MORE) logerror("%s ERROR %u\n", cur_live.tm.as_string(), error);
cur_live.error = error;
syncpoint = true;
}
if (syncpoint) {
live_delay(RUNNING_SYNCPOINT);
return;
}
break;
}
case RUNNING_SYNCPOINT: {
m_write_ready(cur_live.ready);
m_write_brdy(cur_live.brdy);
m_write_sync(cur_live.sync);
m_write_error(cur_live.error);
cur_live.state = RUNNING;
checkpoint();
break;
}
}
}
}
