S-34C02A Datasheet, PDF (13/34 Pages) Seiko Instruments Inc – 2-WIRE CMOS SERIAL E2PROM FOR DIMM SERIAL PRESENCE DETECT

2-WIRE CMOS SERIAL E2PROM FOR DIMM SERIAL PRESENCE DETECT
Rev.1.2_00
S-34C02A
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.
S
T
A
R DEVICE
T ADDRESS
W
R
I
T
E WORD ADDRESS (n)
DATA (n)
DATA (n+1)
SDA
LINE
1 0 1 0 A2 A1 A0 0 W7W6W5W4W3W2 W1W0 D7 D6 D5 D4 D3 D2 D1 D0 D7
D0 D7
M
LRA
A
A
A
S
S/C
C
C
C
B
BWK
K
K
K
S
T
O
DATA (n+x)
P
D0
A
C
K
ADR INC
Figure 11 Page Write
ADR INC
ADR INC
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.
Seiko Instruments Inc.
13