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ST25DV04KC Datasheet(PDF) 94 Page - STMicroelectronics |
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ST25DV04KC Datasheet(HTML) 94 Page - STMicroelectronics |
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94 / 203 page  Response parameter: • Error code as Error_flag is set – 03h: command option not supported – 10h: block not available – 11h: the specified block is already locked and thus cannot be locked again – 14h: the specified block was not successfully locked Figure 45. Lock Block frame exchange between VCD and ST25DVxxKC SOF Lock Block request VCD EOF ST25DVxxKC t1 SOF Lock Block response EOF SOF Lock Block response EOF ST25DVxxKC Wt Lock sequence when error 7.6.11 Extended Lock block On receiving the extended Lock block request, the ST25DVxxKC locks the single block value permanently and protects its content against new writing. This command is only applicable for the blocks 0 and 1 which may include a CC file. For a global protection of a area, update accordingly the AiSS bits in the system area. When the Option_flag is set, wait for EOF to respond. The Inventory_flag must be set to 0. During the RF write cycle Wt, there should be no modulation (neither 100% nor 10%), otherwise the ST25DVxxKC may not lock correctly the single block value in memory. The Wt time is equal to t1nom + N × 302 µs (N is an integer). Table 125. Extended Lock block request format Request SOF Request_flags Extended Lock block UID (1) block number CRC16 Request EOF - 8 bits 32h 64 bits 16 bits 16 bits - 1. The field is optional. Request parameter: • Request Flags • UID (optional) • Only block numbers 0 and 1 are allowed to protect the CCFile in case of NDEF (from LSB byte to MSB byte) Table 126. Extended Lock block response format when Error_flag is NOT set Response SOF Response_flags CRC16 Response EOF - 8 bits 16 bits - ST25DV04KC ST25DV16KC ST25DV64KC RF commands DS13519 - Rev 3 page 94/203 |
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