SH7721 datasheet(89/1524 Pages) RENESAS

89 / 1524 page

Section 1

Overview

Rev. 3.00

Jan. 18, 2008

Page 27 of 1458

REJ09B0033-0300

Classification

Symbol

I/O

Name

Function

PINT15 to

PINT0

Port interrupt

requests 15 to 0

Port interrupt request pins

REFOUT

Bus request

Bus request signal for refreshing

Interrupts

IRQOUT

Bus request

Bus request signal for interrupt

Address bus

A25 to A0

Address bus

Outputs addresses.

Data bus

D31 to D0

I/O

Data bus

32-bit bidirectional data bus

CS4 to CS2,

CS0

CS6A, CS6B,

CS5A, CS5B,

CE2A, CE2B,

CE1A, CE1B

Chip select

Chip-select signal for external

memory or devices.

Read strobe

Indicates reading of data from

external devices.

RD/

Read/write

signal

Read/write signal

Bus start

Bus-cycle start signal pin

BACK

Bus request

acknowledge

Indicates that the bus mastership

has been released to an external

device.

BREQ

Bus request

Low when an external device

requests the release of the bus

mastership.

Write enable

Write enable pin for PCMCIA

WE3 (BE3)

Highest-byte

write

Indicates that bits 31 to 24 of the

data in the external memory or

device are being written.

WE2 (BE2)

Second-highest-

byte write

Indicates that bits 23 to 16 of the

data in the external memory or

device are being written.

WE1 (BE1)

Second-lowest-

byte write

Indicates that bits 15 to 8 of the

data in the external memory or

device are being written.

WE0 (BE0)

Lowest-byte

write

Indicates that bits 7 to 0 of the data

in the external memory or device

are being written.

Bus control

CKE

Clock enable

Clock enable (SDRAM)

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