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ST25TV02K 数据表(PDF) 66 Page - STMicroelectronics |
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ST25TV02K 数据表(HTML) 66 Page - STMicroelectronics |
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66 / 90 page  • 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. 6.4.36 Initiate On receiving the 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 request contains: Table 137. Initiate request format Request SOF Request_flags Initiate IC Mfg code CRC16 request EOF - 8 bits D2h 02h 16 bits - Request parameters: • Request flags • Initiated command code Table 138. Initiate 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 6.4.37 Inventory read The Inventory read performs an inventory followed by a multiple block read. If an error is detected, no matter if on the inventory or the read part, ST25TV02K/512 do not answer. The request contains: Table 139. Inventory read request format Request SOF Request_flags Inventory Read IC Mfg code AFI (1) Mask length Mask value First block number Number of blocks CRC16 request EOF - 8 bits D3h 02h 8 bits 8 bits 0 -64 bits 8 bits 8 bits 16 bits - 1. The field is optional. Request parameters: • Request flags. (The Nb_slots flag (bit 6) of the Request flags bits 5 to 8 described in , must be set to 1 for 1 slot inventory. 16 slot inventory is not supported in the inventory read command. • Inventory read command code • AFI if the AFI flag is set • Mask length • Mask value • First block number ST25TV02K ST25TV512 RF commands DS12074 - Rev 11 page 66/90 |
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