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參數(shù)資料
| 型號： | EM4056B6CI2LC |
| 英文描述： | ACPI Regulator/Controller for Dual Channel DDR Memory Systems; Temperature Range: 0°C to 70°C; Package: 28-QFN T&R |
| 中文描述： | 模擬雜項 |
| 文件頁數(shù)： | 14/14頁 |
| 文件大小： | 108K |
| 代理商： | EM4056B6CI2LC |
EM4056
Copyright
2002, EM Microelectronic-Marin SA
9
www.emmicroelectronic.com
Add
Add command to add one 16-bit data word to another 16-bit data word pointed by the specified address, this command
writes the sum at the specified address. It is possible to add a value to an already protected memory location that has been
protected against reading, but not to a memory location that has been protected against writing attempts.
1 bit
4 bits
MSB
8 bits
MSB
16 bits
MSB
8 bits
MSB
Reader
Start
Add
Address
Datas
CRC
2 bits
8 bits
MSB
Transponder
twp WOk nWOk
CRC
Fig. 14
Comp
Compares a 16 bits data word with another word pointed by the specified address.
It is possible to perform a comparison with a value pointed by a read protected address.
But it is impossible to compare a value with another one in the opaque area without entering the PIN. In the case of PIN
violation, the result of the comparison is always false.
Ega=1, comparison successful.
1 bit
4 bits
MSB
8 bits
MSB
16 bits
MSB
8 bits
MSB
Reader
Start
Comp
Address
Datas
CRC
2 bits
8 bits
MSB
Transponder
trp
Ega nEga
CRC
Fig. 15
Login
Compares a 16 bit data word with the PIN word at the address 127.
When a PIN comparison is made (Adr 127) and the identity is established, a write operation occurs in the EEPROM, PIN =
CONF , the success bit is released (SUC = 0), the PIN counter is decremented (PIN = PIN - 1) and the corresponding new
value is written in the EEPROM.
After n erroneous attempts (PIN=0), the ALM bit is set (ALM = 1), and written in the EEPROM. Since that moment the entire
memory is irreversibly locked. The unprotected data words (Rp=0) remain accessible for reading the information they are
containing.
1 bit
4 bits
MSB
16 bits
MSB
8 bits
MSB
Reader
Start
Login
Datas
CRC
4 bits
8 bits
MSB
Transponder
twp Ega nEga WOk nWOk
CRC
Fig. 16
Ega=1, password ok. Wok=1, writing operation successful.
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