STTS2004 datasheet(41/58 Pages) STMICROELECTRONICS

Nome de Peças	STTS2004

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PDF	58 Pages

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Fabricante Electrônico	STMICROELECTRONICS [STMicroelectronics]

Página de início	http://www.st.com

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STTS2004

Use in a memory module

6.1.2

DIMM inserted in the application motherboard

As the final application cannot drive the A0 pin to VHV, this option is not available.

Table 26 and Table 27 show how the Ack bits can be used to identify the write-protection

status.

Table 26. Acknowledge when writing data or defining the write-protection status

(instructions with R/W_n bit = 0)

Status

Instruction

Ack

Address

Ack

Data byte

Ack

Write

cycle (tW)

Protected

SWPn

NoAck

Not

significant

NoAck

Not

significant

NoAck

CWP

Ack

Not

significant

Ack

Not

significant

Ack

Yes

Page or byte write

in protected block

Ack

Address

Ack

Data

NoAck

Not

protected

SWPn or CWP

Ack

Not

significant

Ack

Not

significant

Ack

Yes

Page or byte write

Ack

Address

Ack

Data

Ack

Yes

Table 27. Acknowledge when reading the protection status

(instructions with R/W_n bit = 1)

SWPn status

Instruction

Ack

Address

Ack

Data byte

Ack

Set

RPSn

NoAck

Not significant

NoAck

Not significant

NoAck

Not set

RPSn

Ack

Not significant

NoAck

Not significant

NoAck

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