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M34E02 Datasheet(PDF) 10 Page - STMicroelectronics

Part # M34E02
Description  2 Kbit serial presence detect (SPD) EEPROM for double data rate (DDR1 and DDR2) DRAM modules
PDF  34 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

M34E02 Datasheet(HTML) 10 Page - STMicroelectronics

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Signal description
M34E02, M34E02-F
10/34
Doc ID 10367 Rev 10
Figure 5.
I2C bus protocol
Table 2.
Device select code
Chip Enable
signals
Device type identifier
Chip Enable bits
RW
b7(1)
1.
The most significant bit, b7, is sent first.
b6
b5
b4
b3
b2
b1
b0
Memory area select
code (two arrays)(2)
2.
E0, E1 and E2 are compared against the respective external pins on the memory device.
E2
E1
E0
1
0
1
0
E2
E1
E0
RW
Set write protection
(SWP)
VSS
VSS VHV
(3)
3.
VHV is defined in Table 13.
01
10
00
1
0
Clear write protection
(CWP)
VSS
VCC VHV
(3)
01
1
0
Permanently set write
protection (PSWP)(2)
E2
E1
E0
E2
E1
E0
0
Read SWP
VSS
VSS VHV
(3)
00
1
1
Read CWP
VSS
VCC VHV
(3)
01
1
1
Read PSWP(2)
E2
E1
E0
E2
E1
E0
1
SCL
SDA
SCL
SDA
SDA
Start
condition
SDA
Input
SDA
Change
AI00792c
Stop
condition
1
23
7
89
MSB
ACK
Start
condition
SCL
1
23
7
89
MSB
ACK
Stop
condition



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