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參數(shù)資料
| 型號： | SLE4432C |
| 廠商： | SIEMENS A G |
| 元件分類： | DRAM |
| 英文描述： | ICs for Chip Cards Intelligent 256-Byte EEPROM |
| 中文描述： | 256 X 8 I2C/2-WIRE SERIAL EEPROM, UUC |
| 封裝： | DIE |
| 文件頁數(shù)： | 23/35頁 |
| 文件大?。?/td> | 1011K |
| 代理商： | SLE4432C |
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SLE 4432
SLE 4442
Semiconductor Group
21
2.4
PSC Verification (SLE 4442 only)
The SLE 4442 requires a correct verification of the Programmable Security Code PSC stored in the
Security Memory for altering data if desired.
The following procedure has to be carried out exactly as described. Any variation leads to a failure,
so that a write/erase access will not be achieved. As long as the procedure has not been
successfully concluded the error counter bits can only be changed from “1” to “0” but not erased.
At first an error counter bit has to be written to “0” by an UPDATE command (
see figure 11
) followed
by three COMPARE VERIFICATION DATA commands beginning with byte 1 of the reference data.
A successful conclusion of the whole procedure can be recognized by being able to erase the error
counter which is not automatically erased. Now write/erase access to all memory areas is possible
as long as the operating voltage is applied. In case of error the whole procedure can be repeated as
long as erased counter bits are available. Having been enabled, the reference data are allowed to
be altered like any other information in the EEPROM.
The following table gives an overview of the necessary commands for the PSC verification. The
sequence of the shaded commands is mandatory.
As shipped, the PSC is programmed with a code according to individual agreement with the
customer. Thus, knowledge of this code is indispensable to alter data.
Command
Control
Address
Data
Remark
B7…B0
A7…A0
D7…D0
Read security Memory
31
H
39
H
No effect
No effect
Check Error Counter
Update Security Memory
00
H
Input data
Write free bit in Error
Counter input data:
0000 0ddd binary
Compare Verification Data
33
H
33
H
33
H
39
H
31
H
01
H
02
H
03
H
00
H
No effect
Input data
Reference Data Byte 1
Compare Verification Data
Input data
Reference Data Byte 2
Compare Verification Data
Input data
Reference Data Byte 3
Update Security Memory
FF
H
No effect
Erase Error Counter
Read Security Memory
Check Error Counter
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| SLE4432M2.2 | ICs for Chip Cards Intelligent 256-Byte EEPROM |
| SLE4442C | ICs for Chip Cards Intelligent 256-Byte EEPROM |
| SLE4442M2.2 | ICs for Chip Cards Intelligent 256-Byte EEPROM |
| SLE44R35S | Interlligent 1K-byte EEPROM with Interface for Contactless Transistors,Security Logic and Anticollision(帶無接口晶體管，安全邏輯和防碰撞智能1K位EEPROM) |
| SLE4520 | Pulse-Width Modulator |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SLE4432M2.2 | 制造商:INFINEON 制造商全稱:Infineon Technologies AG 功能描述:ICs for Chip Cards Intelligent 256-Byte EEPROM |
| SLE4432M3 | 制造商:INFINEON 制造商全稱:Infineon Technologies AG 功能描述:ICs for Chip Cards / Intelligent 256/64/128-Byte EEPROM |
| SLE4436 | 制造商:INFINEON 制造商全稱:Infineon Technologies AG 功能描述:Security & Chip Card ICs |
| SLE4436C | 制造商:INFINEON 制造商全稱:Infineon Technologies AG 功能描述:Security & Chip Card ICs |
| SLE4436E | 制造商:INFINEON 制造商全稱:Infineon Technologies AG 功能描述:Security & Chip Card ICs |
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