2-WIRE CMOS SERIAL E2PROM FOR DIMM SERIAL PRESENCE DETECT

S-34C02A

Seiko Instruments Inc.

13

6. 2 Page Write

The S-34C02A is able to Page Write of 16-bit.

Its basic process to transmit data is as same as Byte Write, but it operates Page Write by sequentially receiving 8-

bit Write data as much data as the page size has.

When the S-34C02A receives the 7-bit device address and Read/Write instruction code “0” after receiving a start

condition, it generates an acknowledgment signal. Next, by receiving the 8-bit word address, it generates an

acknowledgment signal. After the S-34C02A generated an acknowledgment signal by receiving 8-bit Write data, the

S-34C02A receives 8-bit Write data equivalent to the next word address so that it generates an acknowledgment

signal. Receiving 8-bit Write data and generating an acknowledgment signal are sequentially repeated, so that S-

34C02A can receive Write data which has the largest page size.

By receiving a stop condition, the Write operation in an address area equivalent to the received page size starts.

R

/

W

S

T

A

R

T

1 0 1 0

W

R

I

T

E

S

T

O

P

DEVICE

ADDRESS

DATA (n)

WORD ADDRESS (n)

M

S

B

SDA

LINE

A2 A1 A0

A

C

K

L

S

B

A

C

K

A

C

K

0

W7W6W5W4W3W2W1W0

D7 D6 D5 D4 D3 D2 D1 D0

D7

D0

D7

D0

ADR INC

A

C

K

ADR INC

A

C

K

DATA (n+1)

ADR INC

Figure 11 Page Write

In the S-34C02A, the lower 4 bits of the word address are automatically incremented every time when the S-

34C02A receives 8-bit write data. If the size of Write data exceeds 16-byte, the higher 4-bit of the word address

remain unchanged, and the lower 4 bits are rolled over and previously received data will be overwritten.