IS23SC4442 データシートの表示（PDF） - Integrated Silicon Solution

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IS23SC4442

256 BYTE EEPROM WITH WRITE PROTECT FUNCTION AND PROGRAMMABLE SECURITY

Integrated Silicon Solution 

IS23SC4442

ISSI ®

Read Main Memory

The command reads out the memory contents from the

given address (N) to the last address of the memory (with

LSB first). After the command entry, the IFD has to

provide sufficient clock pluses. The number of clock

pulse = (256 - N) x 8+1. The main memory can always

be read.

Address (decimal)

255

:

32

31

:

1

0

Main Memory

Data Byte 255 (D7 ...D0)

:

Data Byte 32 (D7 ... D0)

Data Byte 31(D7 ... D0)

:

Data Byte 1 (D7 ... D0)

Data Byte 0 (D7 ... D0)

Protection Memory

—

—-

—

Protection Bit 31 (D31)

:

Protection Bit 1 (D1)

Protection Bit 0 (D0)

Security Memory

—

—

—

—

—

Reference Data Byte 1

(D7...D0)

Error Counter

Binary

Control

B7 B6 B5 B4 B3 B2 B1 B0

0

01 10 000

Hexadecimal

30H

Address

A7... A0

Address

00H ... FFH

Data

D7... D0

No Effect

No Effect

Command

IFD set I/O

to level L

Outgoing Data

IC sets I/O

To Level Z

0

1

24

CLK

...

I/O

B0 .. B7

0

1

10

...

D0

D1 .. D0

D1 .. D0 .. D7

Start

from IFD

Stop

from IFD

Data of

Startaddress

Start of

Outgoing Data

Data of

Startaddress +1

Data of

Startaddress 255

Figure: Read Main Memory

Integrated Silicon Solution, Inc. — www.issi.com — 1-800-379-4774

9

Rev. 00B

08/01/03

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