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// license:BSD-3-Clause
// copyright-holders:Couriersud
/**********************************************************************************************
Texas Instruments TMS6100 Voice Synthesis Memory (VSM)
Written for MAME by Couriersud
Todo:
- implement CS
- implement clock pin(CLK) and gating(RCK) properly
- implement chip addressing (0-15 mask programmed)
TMS6100:
+-----------------+
VDD | 1 28 | NC
NC | 2 27 | NC
DATA/ADD1 | 3 26 | NC
DATA/ADD2 | 4 25 | NC
DATA/ADD4 | 5 24 | NC
DATA/ADD8 | 6 23 | NC
CLK | 7 22 | NC
NC | 8 21 | NC
NC | 9 20 | NC
M0 | 10 19 | NC
M1 | 11 18 | NC
NC | 12 17 | NC
/CS | 13 16 | NC
VSS | 14 15 | NC
+-----------------+
TMS6125:
+---------+
DATA/ADD1 | 1 16 | NC
DATA/ADD2 | 2 15 | NC
DATA/ADD4 | 3 14 | NC
RCK | 4 13 | NC
CLK | 5 12 | VDD
DATA/ADD8 | 6 11 | CS
NC | 7 10 | M1
M0 | 8 9 | VSS
+---------+
Mitsubishi M58819S EPROM Interface:
+-----------------+
AD0 | 1 40 | AD1
VDDl | 2 39 | AD2
VDD | 3 38 | AD3
A0 | 4 37 | NC
NC | 5 36 | AD4
NC | 6 35 | AD5
A1 | 7 34 | AD6
A2 | 8 33 | AD7
A3/Q | 9 32 | AD8
CLK | 10 31 | AD9
POW | 11 30 | AD10
SL | 12 29 | AD11
C0 | 13 28 | AD12
C1 | 14 27 | AD13
NC | 15 26 | D7
NC | 16 25 | NC
VSS | 17 24 | D6
D0 | 18 23 | D5
D1 | 19 22 | D4
D2 | 20 21 | D3
+-----------------+
The M58819S is used as an interface to external speech eproms.
Other than not having its ROM internal, it is a clone of TMS6100.
C0/C1 = command pins, equal to M0/M1
SL = PROM expansion input
POC = power-on clear (think reset)
***********************************************************************************************/
#include "tms6100.h"
#define VERBOSE (0)
#if VERBOSE
#define LOG(x) logerror x
#else
#define LOG(x)
#endif
#define TMS6100_READ_PENDING 0x01
#define TMS6100_NEXT_READ_IS_DUMMY 0x02
const device_type TMS6100 = &device_creator<tms6100_device>;
tms6100_device::tms6100_device(const machine_config &mconfig, device_type type, const char *name, const char *tag, device_t *owner, UINT32 clock, const char *shortname, const char *source)
: device_t(mconfig, type, name, tag, owner, clock, shortname, source),
m_rom(*this, DEVICE_SELF),
m_reverse_bits(false),
m_4bit_read(false)
{
}
tms6100_device::tms6100_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock)
: device_t(mconfig, TMS6100, "TMS6100", tag, owner, clock, "tms6100", __FILE__),
m_rom(*this, DEVICE_SELF),
m_reverse_bits(false),
m_4bit_read(false)
{
}
const device_type M58819 = &device_creator<m58819_device>;
m58819_device::m58819_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock)
: tms6100_device(mconfig, M58819, "M58819S", tag, owner, clock, "m58819s", __FILE__)
{
}
//-------------------------------------------------
// device_start - device-specific startup
//-------------------------------------------------
void tms6100_device::device_start()
{
// zerofill
m_addr_bits = 0;
m_address = 0;
m_address_latch = 0;
m_loadptr = 0;
m_m0 = 0;
m_m1 = 0;
m_state = 0;
m_data = 0;
m_tms_clock = 0;
// save device variables
save_item(NAME(m_addr_bits));
save_item(NAME(m_address));
save_item(NAME(m_address_latch));
save_item(NAME(m_loadptr));
save_item(NAME(m_m0));
save_item(NAME(m_m1));
save_item(NAME(m_state));
save_item(NAME(m_data));
save_item(NAME(m_tms_clock));
}
void m58819_device::device_start()
{
tms6100_device::device_start();
m_reverse_bits = true; // m58819 'vsm-emulator' chip expects ROM bit order backwards
}
// external i/o
WRITE_LINE_MEMBER(tms6100_device::m0_w)
{
m_m0 = (state) ? 1 : 0;
}
WRITE_LINE_MEMBER(tms6100_device::m1_w)
{
m_m1 = (state) ? 1 : 0;
}
WRITE8_MEMBER(tms6100_device::addr_w)
{
m_addr_bits = data & 0xf;
}
READ8_MEMBER(tms6100_device::data_r)
{
return m_data;
}
READ_LINE_MEMBER(tms6100_device::data_line_r)
{
// DATA/ADD8
return m_data;
}
// CLK/RCK pin
WRITE_LINE_MEMBER(tms6100_device::romclock_w)
{
// process on falling edge
if (m_tms_clock && !state)
{
switch (m_m1 << 1 | m_m0)
{
case 0x00:
// NOP in datasheet, not really ...
if (m_state & TMS6100_READ_PENDING)
{
if (m_state & TMS6100_NEXT_READ_IS_DUMMY)
{
LOG(("loaded address %08x\n", m_address_latch));
m_address = (m_address_latch << 3);
m_address_latch = 0;
m_loadptr = 0;
m_state &= ~TMS6100_NEXT_READ_IS_DUMMY;
}
else
{
// read bit(s) at address
UINT8 word = m_rom[m_address >> 3];
if (m_reverse_bits)
word = BITSWAP8(word,0,1,2,3,4,5,6,7);
if (m_4bit_read)
{
m_data = word >> (m_address & 4) & 0xf;
m_address += 4;
}
else
{
m_data = word >> (m_address & 7) & 1;
m_address++;
}
}
m_state &= ~TMS6100_READ_PENDING;
}
break;
case 0x01:
// READ
m_state |= TMS6100_READ_PENDING;
break;
case 0x02:
// LOAD ADDRESS
m_state |= TMS6100_NEXT_READ_IS_DUMMY;
m_address_latch |= (m_addr_bits << m_loadptr);
LOG(("loaded address latch %08x\n", m_address_latch));
m_loadptr += 4;
break;
case 0x03:
// READ AND BRANCH
if (m_state & TMS6100_NEXT_READ_IS_DUMMY)
{
m_state |= TMS6100_READ_PENDING;
m_state &= ~TMS6100_NEXT_READ_IS_DUMMY; // clear - no dummy read according to datasheet
m_address = m_rom[m_address_latch] | (m_rom[m_address_latch+1] << 8);
m_address &= 0x3fff; // 14 bits
LOG(("loaded indirect address %04x\n", m_address));
m_address = (m_address << 3);
m_address_latch = 0;
m_loadptr = 0;
}
break;
}
}
m_tms_clock = state;
}
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