SH7205 datasheet(68/1904 Pages) RENESAS

68 / 1904 page

Section 1 Overview

Rev. 1.00 Mar. 25, 2008 Page 36 of 1868

REJ09B0372-0100

Classification

Symbol

I/O

Name

Function

CS5 to CS0

Chip select 5 to 0 Chip-select signals for external

memory or devices.

Read

Indicates that data is read from an

external device.

RD_

WR/WE

Read/write

Read/write signal.

WAIT

Wait

Inserts wait cycles into bus cycles

during access to the external space.

WE0/BC0/

DQM0

Byte select

Indicates a write access to bits 7 to 0

of data in external memory or device.

WE1/BC1/

DQM1

Byte select

Indicates a write access to bits 15 to

8 of data in external memory or

device.

WE2/BC2/

DQM2

Byte select

Indicates a write access to bits 23 to

16 of data in external memory or

device.

WE3/BC3/

DQM3

Byte select

Indicates a write access to bits 31 to

24 of data in external memory or

device.

RAS

Connected to the

RAS pin when

SDRAM is connected.

CAS

Connected to the

CAS pin when

SDRAM is connected.

SDCS1,

SDCS0

Chip select

Connected to the

CS pin when

SDRAM is connected.

SDWE

SDRAM write

enable

Connects to the WE pin of SDRAM if

SDRAM is connected (

SDWE).

Bus control

CKE

CK enable

Connected to the CKE pin when

SDRAM is connected.

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