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ST25DV64K 数据表(PDF) 129 Page - STMicroelectronics |
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ST25DV64K 数据表(HTML) 129 Page - STMicroelectronics |
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129 / 200 page  Figure 67. Fast Extended Read Single Block frame exchange between VCD and ST25DVxxx SOF Fast Extended Read Single Block request VCD ST25DVxxx EOF SOF Fast Extended Read Single Block response EOF t1 7.6.39 Fast Read Multiple Blocks On receiving the Fast Read Multiple Blocks command, the ST25DVxxx reads the selected blocks and sends back their value in multiples of 32 bits in the response. The blocks are numbered from 00h up to the last block of user memory in the request, and the value is minus one (–1) in the field. For example, if the “Number of blocks” field contains the value 06h, seven blocks are read. The maximum number of blocks is fixed to 256 assuming that they are all located in the same area. If the number of blocks overlaps area or overlaps the end of user memory, the ST25DVxxx returns an error code. When the Option_flag is set, the response includes the Block Security Status. The data rate of the response is multiplied by 2. The subcarrier_flag should be set to 0, otherwise the ST25DVxxx answers with an error code. The Inventory_flag must be set to 0. Block number is coded on 1 Byte and only first 256 blocks of ST25DV16K-xx and ST25DV64K-xx can be addressed using this command. Table 221. Fast Read Multiple Block request format Request SOF Request_flags Fast Read Multiple Block IC Mfg code UID (1) First block number Number of blocks CRC16 Request EOF - 8 bits C3h 02h 64 bits 8 bits 8 bits 16 bits - 1. This field is optional. Request parameters: • Request flag • UID (Optional) • First block number • Number of blocks Table 222. Fast Read Multiple Block response format when Error_flag is NOT set Response SOF Response_flags Block security status (1) Data CRC16 Response EOF - 8 bits 8 bits (2) 32 bits(2) 16 bits - 1. This field is optional. 2. Repeated as needed. Response parameters: • Block security status if Option_flag is set (see Table 223. Block security status if Option_flag is set) • N block of data ST25DV04K ST25DV16K ST25DV64K RF commands DS10925 - Rev 9 page 129/200 |
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