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PCF7936AS 数据表(PDF) 8 Page - NXP Semiconductors |
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PCF7936AS 数据表(HTML) 8 Page - NXP Semiconductors |
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8 / 32 page  NXP Semiconductors Product Specification Security Transponder (HITAG2) PCF7936AS 2010 May 04 8 CONFIDENTIAL MSB LSB USER 0 Page 4 Page 5 Page 6 Page 7 USER 1 USER 2 USER 3 IDE bit 31 bit 0 Page 0 PSW B X PSW T Page 1 Page 2 Page 3 b0 b31 USER 0 Page 4 Page 5 Page 6 Page 7 USER 1 USER 2 USER 3 IDE Page 0 SK (low) X SK (high) TMCF PSW T Page 1 Page 2 Page 3 b0 b31 b32 b47 Password Mode (ENC = 0) Cipher Mode (ENC = 1) MSB LSB bit 31 bit 0 b0 b23 TMCF b0 b23 not used Figure 4. Transponder Memory Map Note 1. Locations marked ‘X’ are for device internal use. They are partly initialized and locked against overwriting during device manufacturing and are not available for data storage. Any read operation yields an undefined bit value. Pages 0 to 3 of the EEPROM memory are reserved for transponder configuration and personalization, while Page 4 to 7 are reserved for user data storage, USER. According to the selected authorization method, page 1 and 2 do hold a Password, PSW B, (Password mode) or the Secret Key, SK, (Cipher mode). 7.1.1 Identifier, IDE The Identifier, IDE, is a factory programmed quasi unique 32 bit pattern that serves the function of a device serial number (SN) and product type identification (PI). The Identifier is located in page 0 and supports read access only, thus cannot be altered. The product type identification is located in the bits 4 to 7 and factory programmed for all PCF7936AS devices to 1H, as shown in Figure 5. SN 0 MSB LSB bit 31 87 4 3 0 bit 7 4 6 5 PI SN 2 SN 3 SN 1 IDE PI 0 0 1 0 Figure 5. Identifier Organization, IDE The Identifier, IDE, is transmitted in plain and incorporated in the process of device authentication, thus used by the on-chip Calculation Unit as well as by the interrogating system. 7.1.2 Password Basestation, PSW B The Password Basestation, PSW B, is applicable in Password mode only (ENC = 0). The Password Basestation is a 32 bit pattern, which typically is initialized and subsequently locked by the customer during device personalization. The Password Basestation is located in page 1, see Figure 4. During the process to identify the basestation towards the transponder, the transponder verifies the password received by the basestation with the password stored in PSW B. If both match each other, the transponder assumes successful identification of the basestation and the authentication sequence is continued, otherwise it is terminated. For details refer to section 7.3.1, START_AUTH command. The Password Basestation may be assigned any value that is considered useful by the application. The PSW B can be protected against reading and writing by setting the lock bit SKL, see section 7.1.4 NXP initializes the Password Basestation with a common Transport Key value as specified (see section 8), in order to enable initial device access. Since the corresponding lock bit is not set, the PSW B Transport Key value and device configuration can be read and modified at any time as desired. |
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