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hd6301x/y: ddr1/ddr3 is 1-bit

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This commit is contained in:
hap 2023-12-23 21:18:39 +01:00
parent c0082b08bc
commit 815e02b865
2 changed files with 19 additions and 12 deletions
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29
src/devices/cpu/m6800/m6801.cpp
View File

@ -317,7 +317,7 @@ void hd6301x_cpu_device::hd6301x_io(address_map &map)
{
hd6303x_io(map);
map(0x0002, 0x0002).rw(FUNC(hd6301x_cpu_device::p1_data_r), FUNC(hd6301x_cpu_device::p1_data_w)); // external except in single-chip mode
map(0x0004, 0x0004).rw(FUNC(hd6301x_cpu_device::ff_r), FUNC(hd6301x_cpu_device::p3_ddr_w)); // external except in single-chip mode
map(0x0004, 0x0004).rw(FUNC(hd6301x_cpu_device::ff_r), FUNC(hd6301x_cpu_device::p3_ddr_1bit_w)); // external except in single-chip mode
map(0x0006, 0x0006).rw(FUNC(hd6301x_cpu_device::p3_data_r), FUNC(hd6301x_cpu_device::p3_data_w)); // external except in single-chip mode
map(0x0007, 0x0007).rw(FUNC(hd6301x_cpu_device::p4_data_r), FUNC(hd6301x_cpu_device::p4_data_w)); // external except in single-chip mode
map(0x0018, 0x0018).rw(FUNC(hd6301x_cpu_device::p7_data_r), FUNC(hd6301x_cpu_device::p7_data_w)); // external except in single-chip mode
@ -350,9 +350,9 @@ void hd6301y_cpu_device::hd6303y_io(address_map &map)
void hd6301y_cpu_device::hd6301y_io(address_map &map)
{
hd6303y_io(map);
map(0x0000, 0x0000).rw(FUNC(hd6301y_cpu_device::ff_r), FUNC(hd6301y_cpu_device::p1_ddr_w)); // external except in single-chip mode
map(0x0000, 0x0000).rw(FUNC(hd6301y_cpu_device::ff_r), FUNC(hd6301y_cpu_device::p1_ddr_1bit_w)); // external except in single-chip mode
map(0x0002, 0x0002).rw(FUNC(hd6301y_cpu_device::p1_data_r), FUNC(hd6301y_cpu_device::p1_data_w)); // external except in single-chip mode
map(0x0004, 0x0004).rw(FUNC(hd6301y_cpu_device::ff_r), FUNC(hd6301y_cpu_device::p3_ddr_w)); // external except in single-chip mode
map(0x0004, 0x0004).rw(FUNC(hd6301y_cpu_device::ff_r), FUNC(hd6301y_cpu_device::p3_ddr_1bit_w)); // external except in single-chip mode
map(0x0005, 0x0005).rw(FUNC(hd6301y_cpu_device::ff_r), FUNC(hd6301y_cpu_device::p4_ddr_w)); // external except in single-chip mode
map(0x0006, 0x0006).rw(FUNC(hd6301y_cpu_device::p3_data_r), FUNC(hd6301y_cpu_device::p3_data_w)); // external except in single-chip mode
map(0x0007, 0x0007).rw(FUNC(hd6301y_cpu_device::p4_data_r), FUNC(hd6301y_cpu_device::p4_data_w)); // external except in single-chip mode
@ -1567,6 +1567,12 @@ void m6801_cpu_device::p1_ddr_w(uint8_t data)
}
}
void hd6301y_cpu_device::p1_ddr_1bit_w(uint8_t data)
{
// HD6301Y DDR1 is 1-bit (HD6301X does not have DDR1)
hd6301_cpu_device::p1_ddr_w((BIT(data, 0) ? 0xff : 0x00));
}
uint8_t m6801_cpu_device::p1_data_r()
{
if (m_port_ddr[0] == 0xff)
@ -1594,17 +1600,10 @@ void m6801_cpu_device::p2_ddr_w(uint8_t data)
}
}
// HD6301X0/HD63701X0/HD6303X only
void hd6301x_cpu_device::p2_ddr_2bit_w(uint8_t data)
{
LOGPORT("Port 2 Data Direction Register: %02x\n", data);
data = (BIT(data, 1) ? 0xfe : 0x00) | (data & 0x01);
if (m_port_ddr[1] != data)
{
m_port_ddr[1] = data;
write_port2();
}
// HD6301X DDR2 is 2-bit (it is 8-bit again on HD6301Y)
hd6301_cpu_device::p2_ddr_w((BIT(data, 1) ? 0xfe : 0x00) | (data & 0x01));
}
uint8_t m6801_cpu_device::p2_data_r()
@ -1635,6 +1634,12 @@ void m6801_cpu_device::p3_ddr_w(uint8_t data)
}
}
void hd6301x_cpu_device::p3_ddr_1bit_w(uint8_t data)
{
// HD6301X/Y DDR3 is 1-bit
hd6301_cpu_device::p3_ddr_w((BIT(data, 0) ? 0xff : 0x00));
}
uint8_t m6801_cpu_device::p3_data_r()
{
uint8_t data;

2
src/devices/cpu/m6800/m6801.h
View File

@ -332,6 +332,7 @@ protected:
virtual void write_port2() override;
void p2_ddr_2bit_w(uint8_t data);
void p3_ddr_1bit_w(uint8_t data);
virtual uint8_t p3_data_r() override;
virtual void p3_data_w(uint8_t data) override;
virtual uint8_t p5_data_r();
@ -436,6 +437,7 @@ protected:
// device_execute_interface overrides
virtual void execute_set_input(int inputnum, int state) override;
void p1_ddr_1bit_w(uint8_t data);
void p5_ddr_w(uint8_t data);
virtual uint8_t p5_data_r() override;
void p5_data_w(uint8_t data);