Datasheet
pri_tx
ackb
DAC161P997
(Slave)
DIN
DBACK
ACKB
Master
COMD
pri_tx
1:1
DAC161P997
(Slave)
DIN
DBACK
ACKB
Master
COMD
pri_rx
pri_tx_en_n
1:1
DAC161P997
(Slave)
a
d
c
b
DIN
DBACK
ACKB
Master
pri_tx
COMD
74LVC125
DAC161P997
www.ti.com
SNAS515E –JULY 2011–REVISED OCTOBER 2013
Figure 27. Master without Bidirectional I/O
Figure 28 shows the trivial circuit realization of the SWIF link in simplex mode, unidirectional data flow.
Figure 28. SWIF without Acknowledge Capability
Figure 29 shows the DC coupled SWIF link realization. In this example ACKB output is used to generate the
Acknowledge pulse. This is equivalent to the Acknowledge pulse generated at DBACK, since in transformer
coupled application both ACKB and DBACK have to be pulsed to transmit back to the Master. Note that the
pulse generated by ACKB is active LOW.
Figure 29. DC-Coupled SWIF Link
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