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Epson Research and Development
Vancouver Design Center
S1D13505 Hardware Functional Specification
X23A-A-001-14 Issue Date: 01/02/02
2 Features
2.1 Memory Interface
• 16-bit DRAM interface:
• EDO-DRAM up to 40MHz data rate (80M bytes/sec.).
• FPM-DRAM up to 25MHz data rate (50M bytes/sec.).
• Memory size options:
• 512K bytes using one 256K
×
16 device.
• 2M bytes using one 1M
×
16 device.
• Performance Enhancement Register to tailor the memory control output timing for the DRAM
device.
2.2 CPU Interface
• Supports the following interfaces:
• 8/16-bit SH-4 bus interface.
• 8/16-bit SH-3 bus interface.
• 8/16-bit interface to 8/16/32-bit MC68000 microprocessors/microcontrollers.
• 8/16-bit interface to 8/16/32-bit MC68030 microprocessors/microcontrollers.
• Philips PR31500/PR31700 (MIPS).
• Toshiba TX3912 (MIPS)
• 16-bit Power PC (MPC821) microprocessor.
• 16-bit Epson E0C33 microprocessor.
• PC Card (PCMCIA).
• StrongARM (PC Card).
• NEC VR41xx (MIPS).
• ISA bus.
• Supports the following interface with external logic:
• GX486 microprocessor.
• One-stage write buffer for minimum wait-state CPU writes.
• Registers are memory-mapped – the M/R# pin selects between the display buffer and register
address space.
• The complete 2M byte display buffer address space is addressable as a single linear address
space through the 21-bit address bus.
