STTS2004 Datasheet, PDF (41/58 Pages) STMicroelectronics – 16 bytes Page Write within 5 ms

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 V_HV, 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 (t_W)
SWPn
NoAck
Not
significant
NoAck
Not
significant
NoAck
No
Protected
CWP
Ack
Not
significant
Ack
Not
significant
Ack
Yes
Page or byte write
in protected block
Ack
Address
Ack
Data NoAck
No
Not
SWPn or CWP
Ack
Not
significant
Ack
Not
significant
Ack
Yes
protected
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
Set
RPSn NoAck Not significant NoAck
Not significant
Not set
RPSn
Ack Not significant NoAck
Not significant
Ack
NoAck
NoAck
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