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数据搜索系统，热门电子元器件搜索 |
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LRI2K 数据表(PDF) 70 Page - STMicroelectronics |
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LRI2K 数据表(HTML) 70 Page - STMicroelectronics |
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70 / 89 page  Commands codes LRI2K 70/89 20.19 Fast Inventory Initiated Before receiving the Fast Inventory Initiated command, the LRI2K must have received an Initiate or a Fast Initiate command in order to set the Initiate_ flag. If not, the LRI2K does not answer to the Fast Inventory Initiated command. On receiving the Fast Inventory Initiated request, the LRI2K runs the anticollision sequence. The Inventory_flag must be set to 1. The Meaning of Flags 5 to 8 is shown in Table 13: Request flags 5 to 8 when bit 3 = 1. The data rate of the response is multiplied by 2. The request contains: ● the flags, ● the Inventory command code ● the AFI if the AFI flag is set ● the mask length ● the mask value ● the CRC The LRI2K does not generate any answer if an error occurs. The response contains: ● The flags ● the Unique ID During an Inventory process, if the VCD does not receive an RF LRI2K 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 (323.3 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 LRI2K to transmit an SOF to the VCD ● tNRT is the nominal response time of the LRI2K tNRT and tSOF are dependent on the LRI2K-to-VCD data rate and subcarrier modulation mode. Table 76. Fast Inventory Initiated request format Request SOF Request Flags Fast Inventory Initiated IC Mfg Code Optiona l AFI Mask length Mask value CRC16 Request EOF 8 bits C1h 02h 8 bits 8 bits 0 - 64 bits 16 bits Table 77. 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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