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Addd documentation about tms5110 prom interface used by bagman and ad2083. [Couriersud]

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Couriersud 2010-06-03 19:18:02 +00:00
parent 94738b8267
commit 734bb0628e
1 changed files with 39 additions and 1 deletions
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40
src/emu/sound/tms5110.c
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@ -1312,6 +1312,44 @@ void tms5110_set_frequency(running_device *device, int frequency)
}
/*
*
* General Interface design (Bagman)
*
* +------------------------------------------------------------------------+
* | |
* +-------------+ | +-------------+ +-------------+ +-------------+ |
* | TMS5100 | | | Counters | | Rom(s) | | Decoder | |
* | ADD8 |<--+ | LS393s | | | | | |
* | | | | | | | Out |--+
* | M0 |---+ | Address |======>| Address | | IN1 |
* | | | | | | Data |======>| ... |
* M | | +---------->| Clk | | | | IN8 |
* A-->| CTL1 | | | | | | |
* P-->| CTL2 | +--->| Reset | | | | |
* P-->| CTL3 | | | | | | | A B C |
* E-->| CTL4 | | +-------------+ +-------------+ +-------------+
* D-->| PDC | | ^ ^ ^
* | | +-------------------------------------------------+ | | |
* | | | Bit Select
* | ROMCLK |---+ +-------------+ +-------------+ |
* | | | | Counter | | PROM | |
* +-------------+ | | LS393 | | D1 | M --+ Reset Bit
* | | Q0 |------>| A0 | A
* +---------->| Clk Q1 |------>| A1 | P ==> CTL1 ... CTL4
* | Q2 |------>| A2 | P --> PDC
* | Reset Q3 |------>| A3 | E --+ Stop Bit
* | | +-->| A4 D8 | D |
* +-------------+ | +-------------+ |
* | |
* | +---+ |
* | | |<-----------------+
* +---| & |
* | |<-------- Enable
* +---+
*
*/
/******************************************************************************
DEVICE_START( tmsprom ) -- allocate buffers initialize
@ -1356,7 +1394,7 @@ static TIMER_CALLBACK( tmsprom_step )
update_prom_cnt(tms);
ctrl = (tms->prom[tms->prom_cnt] | 0x200);
//printf("ctrl %04x, enable %d cnt %d\n", ctrl, tms->enable, tms->prom_cnt);
//if (tms->enable && tms->prom_cnt < 0x10) printf("ctrl %04x, enable %d cnt %d\n", ctrl, tms->enable, tms->prom_cnt);
tms->prom_cnt = ((tms->prom_cnt + 1) & 0x0f) | (tms->prom_cnt & 0x10);
if (ctrl & (1 << tms->intf->reset_bit))