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STTS2004 데이터시트(PDF) 41 Page - STMicroelectronics

부품명 STTS2004
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제조업체  STMICROELECTRONICS [STMicroelectronics]
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STTS2004 데이터시트(HTML) 41 Page - STMicroelectronics

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STTS2004
Use in a memory module
58
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
No
CWP
Ack
Not
significant
Ack
Not
significant
Ack
Yes
Page or byte write
in protected block
Ack
Address
Ack
Data
NoAck
No
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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