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LRIS2K 数据表(PDF) 87 Page - STMicroelectronics |
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LRIS2K 数据表(HTML) 87 Page - STMicroelectronics |
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87 / 102 page  LRIS2K Inventory Initiated 87/102 43 Inventory Initiated Before receiving the Inventory Initiated command, the LRIS2K must have received an Initiate or a Fast Initiate command in order to set the Initiate_ flag. If not, the LRIS2K does not answer to the Inventory Initiated command. On receiving the Inventory Initiated request, the LRIS2K runs the anticollision sequence. The Inventory_flag must be set to 1. The meaning of flags 5 to 8 is given in Table 20: Request_flags 5 to 8 when Bit 3 = 1. The request contains the: ● flags ● Inventory command code ● AFI if the AFI_flag is set ● mask length ● mask value ● CRC The LRIS2K does not generate any answer in case of error. The response contains the: ● flags ● unique ID During an Inventory process, if the VCD does not receive an RF LRIS2K response, it waits 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 where: ● tSOF is the time required by the LRIS2K to transmit an SOF to the VCD ● tNRT is the nominal response time of the LRIS2K tNRT and tSOF are dependent on the LRIS2K-to-VCD data rate and subcarrier modulation mode. Table 87. Inventory Initiated request format Request SOF Request _flags Inventory Initiated IC Mfg code Optional AFI Mask length Mask value CRC16 Request EOF 8 bits D1h 02h 8 bits 8 bits 0 - 64 bits 16 bits Table 88. Inventory Initiated response format Response SOF Response _flags DSFID UID CRC16 Response EOF 8 bits 0x00 64 bits 16 bits |
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