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cpu/mcs51/mcs51.cpp: Implemented PES bit for DS5002FP. (#13224)

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PES bit is peripheral enable select on bytewide bus.
This commit is contained in:
cam900 2025-01-19 01:30:45 +09:00 committed by GitHub
parent c5c18833c8
commit 819cbbf599
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2 changed files with 12 additions and 4 deletions
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14
src/devices/cpu/mcs51/mcs51.cpp
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@ -296,7 +296,7 @@ mcs51_cpu_device::mcs51_cpu_device(const machine_config &mconfig, device_type ty
: cpu_device(mconfig, type, tag, owner, clock)
, m_program_config("program", ENDIANNESS_LITTLE, 8, 16, 0, program_map)
, m_data_config("data", ENDIANNESS_LITTLE, 8, 9, 0, data_map)
, m_io_config("io", ENDIANNESS_LITTLE, 8, (features & FEATURE_DS5002FP) ? 17 : 16, 0)
, m_io_config("io", ENDIANNESS_LITTLE, 8, (features & FEATURE_DS5002FP) ? 18 : 16, 0)
, m_pc(0)
, m_features(features)
, m_rom_size(program_width > 0 ? 1 << program_width : 0)
@ -871,12 +871,18 @@ uint8_t mcs51_cpu_device::r_psw() { return SFR_A(ADDR_PSW); }
In order to simplify memory mapping to the data address bus, the following address map is assumed for partitioned mode:
PES = 0:
0x00000-0x0ffff -> data memory on the expanded bus
0x10000-0x1ffff -> data memory on the byte-wide bus
PES = 1:
0x20000-0x2ffff -> memory-mapped peripherals on the byte-wide bus
For non-partitioned mode the following memory map is assumed:
0x0000-0xffff -> data memory (the bus used to access it does not matter)
PES = 0:
0x00000-0x0ffff -> data memory (the bus used to access it does not matter)
PES = 1:
0x20000-0x2ffff -> memory-mapped peripherals on the byte-wide bus
*/
offs_t mcs51_cpu_device::external_ram_iaddr(offs_t offset, offs_t mem_mask)
@ -891,7 +897,9 @@ offs_t mcs51_cpu_device::external_ram_iaddr(offs_t offset, offs_t mem_mask)
/* if partition mode is set, adjust offset based on the bus */
if (m_features & FEATURE_DS5002FP)
{
if (!GET_PM) {
if (GET_PES) {
offset += 0x20000;
} else if (!GET_PM) {
if (!GET_EXBS) {
if ((offset >= ds5002fp_partitions[GET_PA]) && (offset <= ds5002fp_ranges[m_ds5002fp.range])) {
offset += 0x10000;

2
src/devices/cpu/mcs51/mcs51.h
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@ -153,7 +153,7 @@ protected:
// Memory spaces
memory_access<16, 0, 0, ENDIANNESS_LITTLE>::cache m_program;
memory_access< 9, 0, 0, ENDIANNESS_LITTLE>::specific m_data;
memory_access<17, 0, 0, ENDIANNESS_LITTLE>::specific m_io;
memory_access<18, 0, 0, ENDIANNESS_LITTLE>::specific m_io;
devcb_read8::array<4> m_port_in_cb;
devcb_write8::array<4> m_port_out_cb;