S1D13704 Host Bus Interface; Host Bus Interface Modes - Epson S1D13704 Technical Manual

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3 S1D13704 Host Bus Interface

3.1 Host Bus Interface Modes

S1D13704
SH-3
Pin Names
AB[15:1] A[15:1]
AB0 A0
DB[15:0] D[15:0]
WE1# WE1#
CS# CSn#
BCLK CKIO
BS# BS#
RD/WR# RD/WR#
RD# RD#
WE0# WE0#
WAIT# WAIT#
RESET# RESET#
Interfacing to the Motorola MPC821 Microprocessor
Issue Date: 01/02/12
This section is a summary of the host bus interface modes available on the S1D13704 and
offers some detail on the Generic #1 host bus interface used to implement the interface to
the MPC821 bus.
The S1D13704 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. Six host bus interface modes are supported:
• Hitachi SH-4.
• Hitachi SH-3
• Motorola MC68000 (using Upper Data Strobe/Lower Data Strobe).
• Motorola MC68020/MC68030/MC683xx (using Data Strobe/DSACKx).
• Generic #1 (Chip Select, plus individual Read Enable/Write Enable for each byte).
• Generic #2 (External Chip Select, shared Read/Write Enable for high byte, individual
Read/Write Enable for low byte).
The S1D13704 latches CNF[2:0] and BS# to allow selection of the host bus interface on
the rising edge of RESET#. After releasing reset, the host bus interface signals assume their
selected configuration. The following table shows the functions of each host bus interface
signal.
Table 3-1: Host Bus Interface Pin Mapping
SH-4
A[15:1]
A0
D[15:0]
WE1#
CSn# External Decode External Decode External Decode
CKIO
BS#
RD/WR#
RD# connect to IO V
WE0# connect to IO V
RDY#
RESET#
*
MC68K #1 MC68K #2
A[15:1] A[15:1]
LDS# A0
D[15:0] D[31:16]
UDS# DS#
CLK CLK
AS# AS#
R/W# R/W#
SIZ1
DD
SIZ0
DD
DTACK# DSACK1#
RESET# RESET#
Generic #1 Generic #2
A[15:1] A[15:1]
A0 A0
D[15:0] D[15:0]
WE1# BHE#
External Decode
BCLK BCLK
connect to V connect to IO V
SS
RD1# connect to IO V
RD0# RD#
WE0# WE#
WAIT# WAIT#
RESET# RESET#
X26A-G-010-03
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