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mb8421.cpp
45 lines (36 loc) · 2.32 KB
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mb8421.cpp
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// license:BSD-3-Clause
// copyright-holders:hap,AJR
/**********************************************************************
Dual port RAM with Mailbox emulation
Fujitsu MB8421/22/31/32-90/-90L/-90LL/-12/-12L/-12LL
CMOS 16K-bit (2KB) dual-port SRAM
MB84x2 lacks interrupt pins, it's basically as simple as ram().share("x")
MB843x is same as MB842x, except that it supports slave mode for 16-bit or
32-bit expansion. It makes sure there are no clashes with the _BUSY pin.
IDT71321 is function compatible, but not pin compatible with MB8421
IDT7130 is 1KB variation of IDT71321
CY7C131 is similar as IDT7130
**********************************************************************/
#include "emu.h"
#include "mb8421.h"
template class dual_port_mailbox_ram_base<u8, 10, 8>;
template class dual_port_mailbox_ram_base<u8, 11, 8>;
template class dual_port_mailbox_ram_base<u16, 11, 16>;
template <typename Type, unsigned AddrBits, unsigned DataBits>
constexpr Type dual_port_mailbox_ram_base<Type, AddrBits, DataBits>::DATA_MASK;
template <typename Type, unsigned AddrBits, unsigned DataBits>
constexpr size_t dual_port_mailbox_ram_base<Type, AddrBits, DataBits>::RAM_SIZE;
template <typename Type, unsigned AddrBits, unsigned DataBits>
constexpr offs_t dual_port_mailbox_ram_base<Type, AddrBits, DataBits>::ADDR_MASK;
template <typename Type, unsigned AddrBits, unsigned DataBits>
constexpr offs_t dual_port_mailbox_ram_base<Type, AddrBits, DataBits>::INT_ADDR_LEFT;
template <typename Type, unsigned AddrBits, unsigned DataBits>
constexpr offs_t dual_port_mailbox_ram_base<Type, AddrBits, DataBits>::INT_ADDR_RIGHT;
// 1Kx8
DEFINE_DEVICE_TYPE(CY7C131, cy7c131_device, "cy7c131", "Cypress CY7C131 8-bit Dual-Port SRAM with Interrupts")
DEFINE_DEVICE_TYPE(IDT7130, idt7130_device, "idt7130", "IDT 7130 8-bit Dual-Port SRAM with Interrupts")
// 2Kx8
DEFINE_DEVICE_TYPE(IDT71321, idt71321_device, "idt71321", "IDT 71321 8-bit Dual-Port SRAM with Interrupts")
DEFINE_DEVICE_TYPE(MB8421, mb8421_device, "mb8421", "Fujitsu MB8421 8-bit Dual-Port SRAM with Interrupts")
// 2Kx16
DEFINE_DEVICE_TYPE(MB8421_MB8431_16BIT, mb8421_mb8431_16_device, "mb8421_mb8431_16", "Fujitsu MB8421/MB8431 16-bit Dual-Port SRAM with Interrupts")