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am9517: add clone with the non-standard mask behavior of the PC Transporter ASIC [Carl, R. Belmont]

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This commit is contained in:
arbee 2016-04-13 21:50:44 -04:00
parent 2c70bf1e92
commit c1efcefc26
2 changed files with 79 additions and 2 deletions
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63
src/devices/machine/am9517a.cpp
View File

@ -49,6 +49,7 @@
const device_type AM9517A = &device_creator<am9517a_device>;
const device_type V53_DMAU = &device_creator<upd71071_v53_device>;
const device_type PCXPORT_DMAC = &device_creator<pcxport_dmac_device>;
//**************************************************************************
@ -422,7 +423,7 @@ inline void am9517a_device::dma_advance()
// end_of_process -
//-------------------------------------------------
inline void am9517a_device::end_of_process()
void am9517a_device::end_of_process()
{
// terminal count
if (COMMAND_MEM_TO_MEM)
@ -530,6 +531,11 @@ upd71071_v53_device::upd71071_v53_device(const machine_config &mconfig, const ch
{
}
pcxport_dmac_device::pcxport_dmac_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock)
: am9517a_device(mconfig, PCXPORT_DMAC, "PC Transporter DMAC", tag, owner, clock, "pcx_dmac")
{
}
//-------------------------------------------------
// device_start - device-specific startup
//-------------------------------------------------
@ -1277,3 +1283,58 @@ WRITE8_MEMBER(upd71071_v53_device::write)
trigger(1);
}
void pcxport_dmac_device::device_reset()
{
m_state = STATE_SI;
m_command = 0;
m_status = 0;
m_request = 0;
m_mask = 0;
m_temp = 0;
m_msb = 0;
m_current_channel = -1;
m_last_channel = 3;
m_hreq = -1;
m_eop = 0;
set_hreq(0);
set_eop(ASSERT_LINE);
set_dack();
}
void pcxport_dmac_device::end_of_process()
{
// terminal count
if (COMMAND_MEM_TO_MEM)
{
m_status |= 1 << 0;
m_status |= 1 << 1;
m_request &= ~(1 << 0);
m_request &= ~(1 << 1);
}
else
{
m_status |= 1 << m_current_channel;
m_request &= ~(1 << m_current_channel);
}
if (MODE_AUTOINITIALIZE)
{
// autoinitialize
m_channel[m_current_channel].m_address = m_channel[m_current_channel].m_base_address;
m_channel[m_current_channel].m_count = m_channel[m_current_channel].m_base_count;
}
// don't mask out channel if not autoinitialize
// signal end of process
set_eop(ASSERT_LINE);
set_hreq(0);
m_current_channel = -1;
set_dack();
m_state = STATE_SI;
}

18
src/devices/machine/am9517a.h
View File

@ -46,6 +46,8 @@
class am9517a_device : public device_t,
public device_execute_interface
{
friend class pcxport_dmac_device;
public:
// construction/destruction
am9517a_device(const machine_config &mconfig, device_type type, const char *name, const char *tag, device_t *owner, UINT32 clock, const char *shortname);
@ -90,6 +92,8 @@ protected:
virtual void device_reset() override;
virtual void execute_run() override;
virtual void end_of_process();
int m_icount;
UINT32 m_address_mask;
@ -127,7 +131,6 @@ private:
inline void dma_read();
inline void dma_write();
inline void dma_advance();
inline void end_of_process();
devcb_write_line m_out_hreq_cb;
devcb_write_line m_out_eop_cb;
@ -176,11 +179,24 @@ protected:
};
class pcxport_dmac_device : public am9517a_device
{
public:
// construction/destruction
pcxport_dmac_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock);
protected:
virtual void device_reset() override;
virtual void end_of_process() override;
};
// device type definition
extern const device_type AM9517A;
extern const device_type V53_DMAU;
extern const device_type PCXPORT_DMAC;
/***************************************************************************