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AS3955 数据表(PDF) 54 Page - ams AG |
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AS3955 数据表(HTML) 54 Page - ams AG |
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54 / 102 page  Page 54 ams Datasheet Document Feedback [v1-04] 2016-Feb-03 AS3955 − Detailed Description Implementation Recommendations While in Extended mode, the NFC device shall not issue a WRITE command to the address space of the internal EEPROM until the buffer is empty. The NFC device can issue a READ command to check internal status flag (io_busy = 0), before writing to EEPROM. It is also not allowed to interleave data communication in Extended mode (e.g. writing to addresses FCh-FFh) and issue a WRITE command to internal EEPROM. If case this happens, writing to internal EEPROM would be successful, but the buffer content would be lost. Reading status flags is always allowed. Error Handling Figure 55 shows how different type of errors in Standalone and Extended communication modes are handled and what is the resulting state of the tag. Figure 55: Error Handling Command Condition AS3955 nak_on_crc_parity=0 AS3955 nak_on_crc_parity=1 (empty fields have same reply as nak_on_crc_parity=0) Any Bit Coding Error No Response, SLEEP Any Incomplete Frame No Response, SLEEP T2T Read Parity Error No Response, SLEEP NAK_1, SLEEP T2T Read CRC Error No Response, SLEEP NAK_1, SLEEP T2T Read 1 Byte Frame (no CRC) No Response, SLEEP T2T Read Empty frame (only CRC bytes) No Response, SLEEP T2T Read Missing address No Response, SLEEP T2T Read Too long frame No Response, SLEEP T2T Read Memory fully locked Send Block Content T2T Read Memory partially locked Send Block Content T2T Read Memory fully protected NAK_4, SLEEP T2T Read Memory partially protected Send unprotected memory as is, replace protected memory with zero bytes T2T Read Memory address range fully not existent NAK_0, SLEEP |
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