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m3comm checkpoint (nw)

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This commit is contained in:
MetalliC 2016-04-07 13:58:38 +03:00
parent b10ffebf58
commit cafabd41cb
2 changed files with 60 additions and 16 deletions
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66
src/mame/machine/m3comm.cpp
View File

@ -5,6 +5,13 @@
// Communication board used by Sega in Model3, NAOMI and Hikaru, uses mostly same design
// interface to main board LATTICE ICs: Model3 - 315-5958, Hikaru - 315-5958A, NAOMI - 315-6194A
// TODO:
// Find out sources of IRQ 2 (flip comm RAM bank) and IRQ 5 (data frame exchange cycle start signal on MASTER)
// Is there any IRQs can be fired to host systems ?
// Implement NAOMI G1-DMA mode
// find out and hook actual networking exchange, some sort of token ring ???
/*
MODEL3 COMMUNICATION BOARD
@ -88,7 +95,7 @@ ADDRESS_MAP_END
*************************************/
static ADDRESS_MAP_START( m3comm_mem, AS_PROGRAM, 16, m3comm_device )
AM_RANGE(0x0000000, 0x000ffff) AM_RAM AM_SHARE("m68k_ram")
AM_RANGE(0x0040000, 0x0040001) AM_READWRITE(commbank_r, commbank_w)
AM_RANGE(0x0040000, 0x00400ff) AM_READWRITE(ctrl_r, ctrl_w)
AM_RANGE(0x0080000, 0x008ffff) AM_RAMBANK("comm_ram")
AM_RANGE(0x00C0000, 0x00C00ff) AM_READWRITE(ioregs_r, ioregs_w)
ADDRESS_MAP_END
@ -186,19 +193,45 @@ UINT16 swapb16(UINT16 data)
///////////// Internal MMIO
READ16_MEMBER(m3comm_device::commbank_r)
READ16_MEMBER(m3comm_device::ctrl_r)
{
switch (offset) {
case 0x00 / 2:
return m_commbank;
default:
logerror("M3COMM CtrlRead from %04x mask %04x unimplemented!\n", offset * 2, mem_mask);
return 0;
}
WRITE16_MEMBER(m3comm_device::commbank_w)
}
WRITE16_MEMBER(m3comm_device::ctrl_w)
{
switch (offset) {
case 0x00 / 2: // Communication RAM bank switch (flipped in IRQ2 and IRQ5 handlers)
m_commbank = data;
membank("comm_ram")->set_base(m_ram->pointer() + (m_commbank ? 0x10000 : 0));
membank("comm_ram")->set_base(m_ram->pointer() + ((m_commbank & 1) ? 0x10000 : 0));
break;
case 0x40 / 2: // IRQ 5 ACK
m_commcpu->set_input_line(M68K_IRQ_5, CLEAR_LINE);
break;
case 0xA0 / 2: // IRQ 2 ACK
m_commcpu->set_input_line(M68K_IRQ_2, CLEAR_LINE);
break;
case 0x80 / 2: // LEDs
case 0xC0 / 2: // possible node unique ID and broadcast flag (7FFF) ????
case 0xE0 / 2: // unknown, conditionally cleared in IRQ6 (receive complete) handler
break;
default:
logerror("M3COMM CtrlWrite to %04x %04x mask %04x\n", offset * 2, data, mem_mask);
}
}
READ16_MEMBER(m3comm_device::ioregs_r)
{
switch (offset) {
case 0x10 / 2: // receive result/status
return 5; // dbg random
case 0x18 / 2: // transmit result/status
return 5; // dbg random
case 0x88 / 2:
return m_status0;
case 0x8A / 2:
@ -211,13 +244,17 @@ READ16_MEMBER(m3comm_device::ioregs_r)
WRITE16_MEMBER(m3comm_device::ioregs_w)
{
switch (offset) {
case 0x16 / 2:
case 0x14 / 2: // written 80 at data receive enable, 0 then 1 at IRQ6 handler
break; // it seems one of these ^v is IRQ6 ON/ACK, another is data transfer enable
case 0x16 / 2: // written 8C at data receive enable, 0 at IRQ6 handler
if ((data & 0xFF) == 0x8C) {
logerror("M3COMM Receive offs %04x size %04x\n", recv_offset, recv_size);
}
m_commcpu->set_input_line(M68K_IRQ_6, ((data & 0xFF) == 0x8C) ? ASSERT_LINE : CLEAR_LINE); // debug hack
break;
case 0x1C / 2:
case 0x1A / 2: // written 80 at data transmit enable, 0 at IRQ4 handler
break; // it seems one of these ^v is IRQ4 ON/ACK, another is data transfer enable
case 0x1C / 2: // written 8C at data transmit enable, 0 at IRQ4 handler
if ((data & 0xFF) == 0x8C) {
logerror("M3COMM Send offs %04x size %04x\n", send_offset, send_size);
}
@ -236,10 +273,10 @@ WRITE16_MEMBER(m3comm_device::ioregs_w)
send_size = (send_size >> 8) | (data << 8);
break;
case 0x88 / 2:
m_status0 = data;
m_status0 = (m_status0 & ~mem_mask) | (data & mem_mask);
break;
case 0x8A / 2:
m_status1 = data;
m_status1 = (m_status1 & ~mem_mask) | (data & mem_mask);
break;
case 0xC0 / 2:
m_commcpu->set_input_line(INPUT_LINE_RESET, data ? CLEAR_LINE : ASSERT_LINE);
@ -294,7 +331,7 @@ READ16_MEMBER(m3comm_device::naomi_r)
return naomi_offset;
case 2: // 5F7020
{
logerror("M3COMM read @ %08x\n", (naomi_control << 16) | naomi_offset);
// logerror("M3COMM read @ %08x\n", (naomi_control << 16) | naomi_offset);
UINT16 value;
if (naomi_control & 1)
value = m68k_ram[naomi_offset / 2];
@ -319,7 +356,14 @@ WRITE16_MEMBER(m3comm_device::naomi_w)
switch (offset)
{
case 0: // 5F7018
logerror("M3COMM control write %04x\n", data);
// bit 0: access RAM is 0 - communication RAM / 1 - M68K RAM
// bit 1: comm RAM bank ??? (not really used)
// bit 5: M68K Reset
// bit 6: ???
// bit 7: ???
// bit 14: G1 DMA bus master 0 - active / 1 - disabled
// bit 15: 0 - enable / 1 - disable this device ???
// logerror("M3COMM control write %04x\n", data);
naomi_control = data;
m_commcpu->set_input_line(INPUT_LINE_RESET, (naomi_control & 0x20) ? CLEAR_LINE : ASSERT_LINE);
break;
@ -327,7 +371,7 @@ WRITE16_MEMBER(m3comm_device::naomi_w)
naomi_offset = data;
break;
case 2: // 5F7020
logerror("M3COMM write @ %08x %04x\n", (naomi_control << 16) | naomi_offset, data);
// logerror("M3COMM write @ %08x %04x\n", (naomi_control << 16) | naomi_offset, data);
if (naomi_control & 1)
m68k_ram[naomi_offset / 2] = data;
else {

4
src/mame/machine/m3comm.h
View File

@ -29,8 +29,8 @@ public:
DECLARE_ADDRESS_MAP(m3_map, 32);
DECLARE_READ16_MEMBER(commbank_r);
DECLARE_WRITE16_MEMBER(commbank_w);
DECLARE_READ16_MEMBER(ctrl_r);
DECLARE_WRITE16_MEMBER(ctrl_w);
DECLARE_READ16_MEMBER(ioregs_r);
DECLARE_WRITE16_MEMBER(ioregs_w);