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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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ST25TV16K датащи(PDF) 31 Page - STMicroelectronics |
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ST25TV16K датащи(HTML) 31 Page - STMicroelectronics |
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31 / 87 page  • 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 ST25TV16K/64K does not generate any answer in case of error. Table 38. 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 39. 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 ST25TV16K/64K 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 ST25TV16K/64K to transmit an SOF to the VCD, • tNRT is the nominal response time of the ST25TV16K/64K. tNRT and tSOF are dependent on the ST25TV16K/64K-to-VCD data rate and subcarrier modulation mode. Note: In case of error, no response is sent by ST25TV16K/64K. 6.4.5 Stay Quiet On receiving the Stay Quiet command, the ST25TV16K/64K 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 ST25TV16K/64K does not process any request if the Inventory_flag is set, • the ST25TV16K/64K processes any Addressed request. The ST25TV16K/64K exits the Quiet state when: • it is reset (power off), • receiving a Select request. It then goes to the Selected state, • receiving a Reset to Ready request. It then goes to the Ready state. ST25TV16K ST25TV64K RF Commands DS11489 - Rev 9 page 31/87 |
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