STTS424E02BDA3F datasheet(37/51 Pages) STMICROELECTRONICS

tên linh kiện	STTS424E02BDA3F

Giải thích chi tiết về linh kiện	Memory module temperature sensor with a 2 Kb SPD EEPROM

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STTS424E02

Use in a memory module

37/51

7.1.2

DIMM inserted in the application motherboard

As the final application cannot drive the A0 pin to VHV, the only possible action is to freeze

the write-protection with the PSWP instruction.

Table 23 and Table 24 show how the Ack bits can be used to identify the write-protection

status.

Table 23.

Acknowledge when writing data or defining the write-protection (instructions with

R/W bit=0)

Status

Input

Level

Instruction

Ack

Address

Ack

Data byte

Ack

Write

cycle(tW)

Permanently

protected

PSWP, SWP or CWP

NoAck

Not

significant

NoAck

Not

significant

NoAck

Page or byte write in

lower 128 bytes

Ack

Address

Ack

Data

NoAck

Protected with

SWP

NoAck

Not

significant

NoAck

Not

significant

NoAck

CWP

Ack

Not

significant

Ack

Not

significant

Ack

Yes

PSWP

Ack

Not

significant

Ack

Not

significant

Ack

Yes

Page or byte write in

lower 128 bytes

Ack

Address

Ack

Data

NoAck

Not Protected

PSWP, SWP or CWP

Ack

Not

significant

Ack

Not

significant

Ack

Yes

Page or byte write

Ack

Address

Ack

Data

Ack

Yes

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