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SCS152-IW Datasheet(PDF) 2 Page - Microchip Technology |
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SCS152-IW Datasheet(HTML) 2 Page - Microchip Technology |
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2 / 16 page  SCS152 DS40150B-page 2 Preliminary © 1997 Microchip Technology Inc. 1.0 PIN DEFINITIONS 2.0 DEVICE OPERATION During the life of the SCS152, it goes through the fol- lowing stages: • Manufacture and wafer probing • Waffle pack and transportation • Personalization and final application. Various fields in the memory map must be initialized. These include the first 24 bits in the memory map, the transport code, and the mode bits. The first 24 bits in the memory map typically identifies the device in its final application. The device has two principle modes: issuer mode and user mode. In issuer mode, all access to the device (except one field) is blocked before a cor- rect transport code has been presented to the device. Thus, the transport code protects the device against theft, before it is personalized. During personalization, all fields, except (Chip Identification Data (CID), are initialized for the intended application: the device serial number is programmed, the token counter is set to its proper value, the user data field is initialized, and the transport code is erased and replaced with a cryptographic key. After power has been applied to the device, the I/O pin is driven low. Once the reset period (TPOR) has expired, the SCS152 is ready to accept commands. These com- mands typically read the memory content serially. The first bit at address 0 is initially driven on the I/O line. Each read clock pulse increments the internal address counter and reads the resulting bit from EEPROM. This serial data stream is composed of various fields pre- sented in Table 2-1. 2.1 CID Field The device CID field contains a device identification code, which is programmed during wafer probe and cannot be changed later. These bits typically identify the type of the device to the system in the application. 2.2 SER Field The SER field contains the device serial number which identifies the individual device. It is programmed while the device is in issuer mode during the personalization stage. 2.3 ISS Field The ISS field indicates whether the device is in issuer mode as determined by the CFG field. This is purely an external view of the CFG field and exists as such for compatibility reasons. ISO Pin Name I/O Type Description C1 VDD Power Power connection C2 SCI INPUT Command input to the device controller C3 SCK INPUT Command execution clock input C5 GND Power Power connection C7 SDIO Bidir (O.D.) Open drain serial data I/O line TABLE 2-1: EXTERNAL REPRESENTATION OF THE INTERNAL MEMORY MAP Field Name Address Size Description CID 0…23 24 Chip identification data SER 24…63 40 Serial number ISS 64 1 Issuer mode status D4 65…71 7 Digit 4 D3 72…79 8 Digit 3 D2 80…87 8 Digit 2 D1 88…95 8 Digit 1 D0 96…103 8 Digit 0 CFG 104…107 4 Configuration data USER0 108…147 40 User area UKEY0 148…211 64 Key area 0 which also acts as the transport code in issuer mode 212…275 64 Undefined |
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