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ST25DV64K 数据表(PDF) 84 Page - STMicroelectronics |
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ST25DV64K 数据表(HTML) 84 Page - STMicroelectronics |
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84 / 200 page  7.6.4 Inventory Upon receiving the Inventory request, the ST25DVxxx runs the anticollision sequence. The Inventory_flag is set to 1. The meaning of flags 5 to 8 is shown in Table 96. Request flags 5 to 8 when inventory_flag, Bit 3 = 1. The request contains: • the flags • the Inventory command code (001) • the AFI if the AFI flag is set • the mask length • the mask value if mask length is different from 0 • the CRC The ST25DVxxx does not generate any answer in case of error. Table 102. Inventory request format Request SOF Request_flags Inventory Optional AFI Mask length Mask value CRC16 Request EOF - 8 bits 01h 8 bits 8 bits 0 - 64 bits 16 bits - The response contains: • the flags • the Unique ID Table 103. Inventory response format Response SOF Response_flags DSFID UID CRC16 Response EOF - 8 bits 8 bits 64 bits 16 bits - During an Inventory process, if the VCD does not receive an RF ST25DVxxx response, it waits for a time t3 before sending an EOF to switch to the next slot. t3 starts from the rising edge of the request EOF sent by the VCD. • If the VCD sends a 100% modulated EOF, the minimum value of t3 is: t3min = 4384/fC (323.3µs) + tSOF • If the VCD sends a 10% modulated EOF, the minimum value of t3 is: t3min = 4384/fC (323.3µs) + tNRT + t2min where: • tSOF is the time required by the ST25DVxxx to transmit an SOF to the VCD, • tNRT is the nominal response time of the ST25DVxxx. tNRT and tSOF are dependent on the ST25DVxxx-to-VCD data rate and subcarrier modulation mode. Note: In case of error, no response is sent by ST25DVxxx. 7.6.5 Stay Quiet On receiving the Stay Quiet command, the ST25DVxxx enters the Quiet state if no error occurs, and does NOT send back a response. There is NO response to the Stay Quiet command even if an error occurs. The Option_flag is not supported. The Inventory_flag must be set to 0. When in the Quiet state: • the ST25DVxxx does not process any request if the Inventory_flag is set, • the ST25DVxxx processes any Addressed request. ST25DV04K ST25DV16K ST25DV64K RF commands DS10925 - Rev 9 page 84/200 |
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