m34e02 STMicroelectronics, m34e02 Datasheet - Page 21

• Manufacturer Part Number: m34e02
• Description: 2 Kbit Serial I?c Bus Eeprom With Permanent And Reversible, Software Write Protection
• Manufacturer: STMicroelectronics

M34E02
5.1.2
DDR2 DIMM inserted in the application mother board
As the final application cannot drive the E0 pin to V
the write-protection with the PSWP instruction.
Table 5
status.
Table 5.
Permanently
Protected
with SWP
Protected
protected
Status
Not
and
Table 6
Acknowledge when writing data or defining the write-protection
(instructions with R/W bit=0)
Input
Level
WC
X
0
1
0
1
show how the Ack bits can be used to identify the write-protection
Page or Byte Write
Page or Byte Write
Page or Byte Write
Page or Byte Write
Page or Byte Write
in lower 128 Bytes
in lower 128 Bytes
PSWP, SWP or
PSWP, SWP or
PSWP, SWP or
Instruction
PSWP
PSWP
CWP
SWP
CWP
SWP
CWP
CWP
CWP
NoAck
NoAck
NoAck
Ack
Ack
Ack
Ack
Ack
Ack
Ack
Ack
Ack
Ack
Ack
Ack
significant
significant
significant
significant
significant
significant
significant
significant
significant
Address
Address
Address
Address
Address
Address
HV
Not
Not
Not
Not
Not
Not
Not
Not
Not
, the only possible action is to freeze
NoAck
NoAck
NoAck
Ack
Ack
Ack
Ack
Ack
Ack
Ack
Ack
Ack
Ack
Ack
Ack
Use within a DDR2 DIMM
Data Byte
significant
significant
significant
significant
significant
significant
significant
significant
significant
Data
Data
Data
Data
Data
Not
Not
Not
Not
Not
Not
Not
Not
Not
NoAck
NoAck
NoAck
NoAck
NoAck
NoAck
NoAck
NoAck
NoAck
NoAck
Ack
Ack
Ack
Ack
Ack
Cycle
Write
(t
Yes
Yes
Yes
Yes
No
No
No
No
No
No
No
No
No
No
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W
)