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AS3955 データシート(PDF) 52 Page - ams AG

部品番号 AS3955
部品情報  NFC Forum Compliant Dynamic Tag
PDF  111 Pages
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メーカー  AMSCO [ams AG]
ホームページ  http://www.ams.com
Logo AMSCO - ams AG

AS3955 データシート(HTML) 52 Page - ams AG

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Page 52
ams Datasheet
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[v1-01] 2015-Apr-29
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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