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Page 10 Epson Research and Development
Vancouver Design Center
S1D13705 Interfacing to the NEC VR4181A™ Microprocessor
X27A-G-013-02 Issue Date: 01/02/13
3 S1D13705 Host Bus Interface
This section is a summary of the host bus interface modes available on the S1D13705 that
would be used to interface to the VR4181A.
The S1D13705 implements a 16-bit interface to the host microprocessor which may operate
in one of several modes compatible with most of the popular embedded microprocessor
families. The interface mode used for the VR4181A is:
• Generic #2 (External Chip Select, shared Read/Write Enable for high byte, individual
Read/Write Enable for low byte).
3.1 Host Bus Pin Connection
For details on configuration, refer to the S1D13705 Hardware Functional Specification,
document number X27A-A-001-xx.
Table 3-1: Host Bus Interface Pin Mapping
S1D13705
Pin Names
Generic #2
AB[16:1] A[16:1]
AB0 A0
DB[15:0] D[15:0]
WE1# BHE#
CS# External Decode
BCLK BCLK
BS# Connect to IO V
DD
RD/WR# Connect to IO V
DD
RD# RD#
WE0# WE#
WAIT# WAIT#
RESET# RESET#