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STTS424E02 Arkusz danych(PDF) 37 Page - STMicroelectronics

Numer części STTS424E02
Szczegółowy opis  Memory module temperature sensor with a 2 Kb SPD EEPROM
PDF  51 Pages
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Producent  STMICROELECTRONICS [STMicroelectronics]
Strona internetowa  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

STTS424E02 Arkusz danych(HTML) 37 Page - STMicroelectronics

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STTS424E02
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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
WC
Input
Level
Instruction
Ack
Address
Ack
Data byte
Ack
Write
cycle(tW)
Permanently
protected
X
PSWP, SWP or CWP
NoAck
Not
significant
NoAck
Not
significant
NoAck
No
Page or byte write in
lower 128 bytes
Ack
Address
Ack
Data
NoAck
No
Protected with
SWP
SWP
NoAck
Not
significant
NoAck
Not
significant
NoAck
No
CWP
Ack
Not
significant
Ack
Not
significant
Ack
Yes
0
PSWP
Ack
Not
significant
Ack
Not
significant
Ack
Yes
Page or byte write in
lower 128 bytes
Ack
Address
Ack
Data
NoAck
No
Not Protected
0
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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