AT88SC6416CRF-MR1 查看數據表（PDF） - Atmel Corporation

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AT88SC6416CRF-MR1

CryptoRF® Specification

Atmel Corporation 

O.5.

Card Data Transmission

The CryptoRF PICC waits silently for a command from the PCD after being activated by the RF field. After receiving a

valid command from the PCD, the PICC is allowed to turn on the subcarrier only if it intends to transmit a complete

response frame. The PICC response consists of TR1, SOF, several bytes of data followed by a 2 byte CRC_B, and the

EOF. The subcarrier is turned off no later than 2 ETUs after the EOF. Figure 49 shows the PICC frame format.

When the subcarrier is turned on it remains unmodulated for a time period known as the synchronization time (TR1).

The phase of the subcarrier during TR1 defines a logical one and permits the reader demodulator to lock on to the

subcarrier signal. The subcarrier remains on until after the EOF transmission is complete. The TR1 transmitted by

CryptoRF is 10 to 11 ETUs in duration for all responses.

Figure 49. Format of a frame transmitted by the PICC to the reader.

Subcarrier Off

Subcarrier On

Transmit Data and CRC_B

Subcarrier Off

TR1

Start of Frame

Data Transmission

End of Frame

O.6.

Response Timing

After the PICC receives a command from the PCD, it is not permitted to transmit a subcarrier during the guard time

(TR0). The minimum guard time is 8 ETUs for all command responses. The maximum guard time is defined by the

frame waiting time (FWT), except for the ATQB response (response to REQB or Slot MARKER polling commands)

which has a maximum TR0 of 32 ETUs.

Figure 50. ISO/IEC 14443 Response timing requirements for the card.

PCD (Reader) CRC

EOF

Unmodulated Carrier

TR0

TR1

PICC (Chip)

Subcarrier OFF

Subcarrier ON

No modulation

SOF

Data

Response

The FWT is the maximum time that a PICC requires to begin a response. The PICC transmits a parameter in the ATQB

response to the polling command that tells the reader the worst case FWT. Typical response times for the CryptoRF

are listed in Appendix Q of this specification. See Appendix P for signal timing specifications.

The PCD is not permitted to modulate the RF field while waiting for a PICC to respond to a command. Modulation of

the RF field during a memory read or write operation may corrupt the operation or cause reset of the PICC.

138 AT88SC0808/1616/3216/6416CRF, AT88RF04C

5276C–RFID–3/09

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