PCF7930

PCF7930/31/35 Memory organisation Memory structure Control memory flags of block 0 Password (Bytes 0..6) The password is 56 bits long. If the pasword function has been ativated by the PAC flag, the pattern being written in this area must be transmitted by the base station with every program command. PCF7930/31/35 1 Password Active Flag PAC (Byte 7) If PAC flag = 1 , date send to the transponder is checked for correctness of the password. Block write Protection BWP (Byte 8) Each block of the user date can be separatelu protected agains programming by setting the block write protection. Control memory flags of block 1 Sync_pattern (Bytes 16..23) In these 8 bytes any type of data can be stored. If RB1 is enabled, the Sync_pattern is always the firs information that is transmitted from the transponder. Identifier pattern IDE (Bytes 24..27) / PCF7935 / If the Identifier function is enabled by IDL this 4-byte pattern is transmitted after the power-up sequence. The IDE pattern is used by the calculation unit during Authentication Mode. PCF7930/31/35 2 Identifier On/Off, Identifier Lock IDL (Byte 28) / PCF7935 / The lower nibble of this memory falg enables/disables the general Identifier function, i.e. The transmission of the IDE pattern at power-on reset and soft-reset. The flag is evaluated as “active” for two or more bits being 1, it is evaluated as “inactive” for less then two bits being 1. The higher nibble of this memory flag locks the IDE pattern...