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LRIS2K 数据表(PDF) 85 Page - STMicroelectronics |
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LRIS2K 数据表(HTML) 85 Page - STMicroelectronics |
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85 / 102 page  LRIS2K Fast Inventory Initiated 85/102 41 Fast Inventory Initiated Before receiving the Fast 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 Fast Inventory Initiated command. On receiving the Fast 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 shown in Table 20: Request_flags 5 to 8 when Bit 3 = 1. The data rate of the response is multiplied by 2. 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 ● the 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 83. Fast Inventory Initiated request format Request SOF Request Flags Fast Inventory Initiated IC Mfg code Optional AFI Mask length Mask value CRC16 Request EOF 8 bits C1h 02h 8 bits 8 bits 0 - 64 bits 16 bits Table 84. Fast Inventory Initiated response format Response SOF Response _flags DSFID UID CRC16 Response EOF 8 bits 00h 64 bits 16 bits |
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