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ST25TV02K 数据表(PDF) 64 Page - STMicroelectronics |
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ST25TV02K 数据表(HTML) 64 Page - STMicroelectronics |
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64 / 90 page  On receiving the Fast Inventory Initiated request, the ST25TV02K/512 run the anticollision sequence. The Inventory_flag must be set to 1. The data rate of the response is multiplied by 2. The ST25TV02K/512 do not generate any answer if an error occurs. Table 131. Fast Inventory Initiated request format Request SOF Request_flags Fast Inventory Initiated IC Mfg code AFI (1) Mask length Mask value CRC16 request EOF - 8 bits C1h 02h 8 bits 8 bits 0 -64 bits 16 bits - 1. The field is optional. Request parameters: • Request flags • Fast Inventory Initiated command code • AFI if the AFI flag is set • mask length • mask value Table 132. Fast Inventory Initiated response format when Error_flag is NOT set Response SOF Response_flags DSFID UID CRC16 request EOF - 8 bits 8 bits 64 bits 16 bits - Response parameter: • DSFID • Unique ID During an Inventory process, if the VCD does not receive an RF ST25TV02K/512 response, it waits t3 time 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 (323.3 μs) + tSOF • If the VCD sends a 10% modulated EOF, the minimum value of t3 is: – t3min = 4384/fC (323.3 μs) + tNRT where: • tSOF is the time required by the ST25TV02K/512 to transmit an SOF to the VCD. • tNRT is the nominal response time of the ST25TV02K/512. • tNRT and tSOF are dependent on the ST25TV02K/512-to-VCD data rate and subcarrier modulation mode. Note: In case of error, no response is sent by ST25TV02K/512. 6.4.34 Fast Initiate On receiving the Fast Initiate command, the ST25TV02K/512 set the internal Initiate_flag and sends back a response. The command has to be issued in the Non Addressed mode only (Select_flag is reset to 0 and Address_flag is reset to 0). If an error occurs, the ST25TV02K/512 do not generate any answer. The Initiate_flag is reset after a power off of the ST25TV02K/512. The data rate of the response is multiplied by 2. Table 133. Fast initiate request format Request SOF Request_flags Fast initiate IC Mfg code CRC16 request EOF - 8 bits C2h 02h 16 bits - Request parameters: ST25TV02K ST25TV512 RF commands DS12074 - Rev 11 page 64/90 |
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