Epson Research and Development

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4 MPC821 to S1D13504 Interface

4.1 Hardware Description

The interface between the S1D13504 and the MPC821 requires no glue logic. All lines are directly connected. A single resistor is used to speed up the rise time of the WAIT# (TA) signal when terminating the bus cycle.

BS# (bus start) is not used in this implementation and should be tied low (connected to GND).

The following diagram shows a typical implementation of the MPC821 to S1D13504 interface.

MPC821

A10

A[11:31]

D[0:15]

CS4

TA

WE0

WE1

OE

SYSCLK

Vcc

470

System RESET

S1D13504

M/R#

AB[20:0]

DB[15:0]

CS#

WAIT#

WE1#

WE0#

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: Typical Implementation of MPC821 to S1D13504 Interface

Note

For pin mapping see Table 3-1:, “Generic MPU Host Bus Interface Pin Mapping” .

Interfacing to the Motorola MPC821 Microprocessor

S1D13504

Issue Date: 01/02/02

X19A-G-010-05

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Image 453
Epson manual Typical Implementation of MPC821 to S1D13504 Interface