AS3956 datasheet(45/107 Pages) AMSCO

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[v1-11] 2018-Nov-14

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AS3956 − Detailed Description

Data Transaction in Tunneling Mode

Figure 44 shows an example of how communication in

Tunneling mode should be implemented.

Figure 44:

Read First, then Acknowledge

ACK and NACK responses can be replaced by data, in case of an

incoming READ command.

Relevant Registers, Interrupts and Commands

Registers:

• Buffer Status Register 1 and Buffer Status Register 2 (data

length and error type)

Interrupts:

• Rx start (I_rxs bit in Interrupt Register 1)

• Rx end, Tx end (resp. I_rxe and I_txe bits in Interrupt

• CRC, parity and framing interrupt (resp. I_crc_err, I_par_

err and I_frm_err bits in Interrupt Register 1)

• Buffer error (I_bf_err in Interrupt Register 1)

• SPI / I²C buffer access error (I_acc_err in

Interrupt Register 1)

Commands:

• Transmit ACK

• Transmit NACK 0-5

• Transmit Buffer

• Go To Sense

• Go To Sleep

• Go To Sense / Sleep

PCD

AS3956

DATA

ACK /

NACK

MCU

DATA

RD O

CMD

ACK /

NACK

Rx start

Rx end, crc or parity error,

bu er error

Tx end

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