// license:BSD-3-Clause // copyright-holders:Miodrag Milanovic /*************************************************************************** Chips & Technologies CS8221 chipset a.k.a. NEW ENHANCED AT (NEAT) Consists of four individual chips: * 82C211 - CPU/Bus controller * 82C212 - Page/Interleave and EMS Memory controller * 82C215 - Data/Address buffer * 82C206 - Integrated Peripherals Controller(IPC) ***************************************************************************/ #include "emu.h" #include "cs8221.h" #include "machine/ram.h" #define LOG_REGISTER (1U << 1) #define LOG_MEMORY (1U << 2) #define VERBOSE (LOG_REGISTER | LOG_MEMORY) #include "logmacro.h" #define LOGREGISTER(...) LOGMASKED(LOG_REGISTER, __VA_ARGS__) #define LOGMEMORY(...) LOGMASKED(LOG_MEMORY, __VA_ARGS__) DEFINE_DEVICE_TYPE(CS8221, cs8221_device, "cs8221", "CS8221 NEAT") static const char *const register_names[] = { /* 00 */ "PROCCLK", /* 01 */ "COMMAND DELAY", /* 02 */ "WAIT STATES", /* 03 */ "RESERVED", /* 04 */ "VERSION", /* 05 */ "ROM CONFIGURATION", /* 06 */ "MEMORY ENABLE-1", /* 07 */ "MEMORY ENABLE-2", /* 08 */ "MEMORY ENABLE-3", /* 09 */ "MEMORY ENABLE-4", /* 0a */ "BANK 0/1 ENABLE", /* 0b */ "DRAM CONFIGURATION", /* 0c */ "BANK 2/3 ENABLE", /* 0d */ "EMS BASE ADDRESS", /* 0e */ "EMS ADDRESS EXTENSION", /* 0f */ "MISCELLANEOUS" }; //************************************************************************** // LIVE DEVICE //************************************************************************** //------------------------------------------------- // cs8221_device - constructor //------------------------------------------------- cs8221_device::cs8221_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock) : device_t(mconfig, CS8221, tag, owner, clock), m_address(0), m_address_valid(false) { } //------------------------------------------------- // device_start - device-specific startup //------------------------------------------------- void cs8221_device::device_start() { } //------------------------------------------------- // device_reset - device-specific reset //------------------------------------------------- void cs8221_device::device_reset() { // setup default values memset(&m_registers, 0x00, sizeof(m_registers)); } //************************************************************************** // READ/WRITE HANDLERS //************************************************************************** void cs8221_device::map(address_map &map) { map(0x0022, 0x0022).w("cs8221", FUNC(cs8221_device::address_w)); map(0x0023, 0x0023).rw("cs8221", FUNC(cs8221_device::data_r), FUNC(cs8221_device::data_w)); } void cs8221_device::address_w(uint8_t data) { m_address = data; m_address_valid = ((m_address & 0x60)== 0x60) ? true : false; } uint8_t cs8221_device::data_r() { uint8_t result = 0xff; if (m_address_valid) { LOGREGISTER("cs8221_device: read %s = %02x\n", register_names[m_address & 0x0f], m_registers[m_address & 0x0f]); result = m_registers[m_address & 0x0f]; } // after a read the selected address needs to be reset m_address_valid = false; return result; } void cs8221_device::data_w(uint8_t data) { if (m_address_valid) { LOGREGISTER("cs8221_device: write %s = %02x\n", register_names[m_address & 0x0f], data); // update register with new data m_registers[m_address & 0x0f] = data; // execute command switch (m_address) { case 0x60: break; case 0x61: break; case 0x62: break; case 0x63: break; case 0x64: break; case 0x65: break; case 0x66: break; case 0x67: break; case 0x68: break; case 0x69: break; case 0x6a: break; case 0x6b: break; case 0x6c: break; case 0x6d: break; case 0x6e: break; case 0x6f: break; } } // after a write the selected address needs to be reset m_address_valid = false; }