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PDF DM2016 Data sheet ( Hoja de datos )
| Número de pieza | DM2016 | |
| Descripción | Software Protect IC | |
| Fabricantes | SDMC | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de DM2016 (archivo pdf) en la parte inferior de esta página. Total 8 Páginas | ||
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Software Protect IC
DM2016
Product Datasheet
1 page  
6、 FUNCTION DESCRIPTION
DM2016 Data sheet
V2.2
Sep 04,2008
2
6.1 I C
DM2016 has an I2C salve device interface,there are two I2C device addresses can be selected
through controlling the external port.The high 6-bit of I2C address is “101000”,so the I2C device
address can be selected with 0xA0，0xA2.
I2C data address space assignment:
Address
0x00-0x7F
0x80-0x8F
0x90-0x97
Description
EEPROM
128 bit secret key
64 bit plain code and encrypted code
The most signification byte of 128 bit secret key is stored in address “0x80”; The least
signification byte of 128 bit secret key is stored in address “0x8F”.
The most signification byte of 64 bit plain code or encrypted code is stored in address
“0x90”,the least signification byte of 64 bit plain code or encrypted code is stored in
address“0x97”.When reading,the data is plain code.When writing,the data is encrypted code.
6.2 Decryption Function
DM2016 is a security chip to prevent from copying. It can effectively protect software
design through a decryption arithmetic and the relative 128 bit secret key. The 128 bit secret
keys are stored in OTP memory.
The authentication process of DM2016 is as below:
A group of 64bit random data generated by program acts as plain code. Program executes the
encryption arithmetic by utilizing the plain code and the same secret key in 128 bit OTP memory,
and generates a group of encrypted code. Then program sends the encrypted code to DM2016 through
I2C interface.DM2016 executes the decryption arithmetic with 128 bit secret key and 64 bit
encrypted code, then generates a group of 64 bit plain code. Program reads back the plain code
through I2C interface, then compares the plain code with the original plain code(64bit random
data).If the two values are equal, it will declare that the authentication pass and the program
will continue to execute. Otherwise, the program will exit.
5
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet DM2016.PDF ] | |
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