Epson Research and Development

Page 11

Vancouver Design Center

 

 

 

4 MC68328 To S1D13504 Interface

4.1 Hardware Description

As mentioned earlier in this application note, the MC68328 multiplexes dual functions on some of its bus control pins, specifically UDS, LDS, and DTACK. If all of these pins are available for use as bus control pins, then the S1D13504 interface is a straightforward implementation of the MC68000 Bus 1 interface mode as described in the S1D13504 Hardware Functional Specification, document number X19A-A-002-xx. Following are the electrical connections required for this interface.

MC68328

A21

A[20:1]

D[15:0]

CSB3

DTACK

AS

UDS

LDS

R/W

CLK0

Vcc

470

Vcc

System RESET

S1D13504

M/R#

AB[20:1]

SD[15:0]

CS#

WAIT#

BS#

WE1#

AB0

RD1#

RD0#

BUSCLK

RESET#

Note:

When connecting the S1D13504 RESET# pin, the system designer should be aware of all conditions that may reset the S1D13504 (e.g. CPU reset can be asserted during wake-up from power-down modes, or during debug states).

Figure 4-1: Block Diagram of MC68328 to S1D13504 Interface - MC68000 Bus 1 Interface Mode

Interfacing to the Motorola MC68328 "Dragonball" Microprocessor

S1D13504

Issue Date: 01/02/02

X19A-G-013-02

Page 431
Image 431
Epson manual MC68328 To S1D13504 Interface, Busclk RESET#