hi-3200 Holt Integrated Circuits, Inc., hi-3200 Datasheet - Page 31

• Manufacturer Part Number: hi-3200
• Description: Avionics Data Management Engine / Arinc 429 - Can Bus Bridge
• Manufacturer: Holt Integrated Circuits, Inc.

The Host CPU may instruct the HI-3200 to transmit an
ARINC 429 message immediately using a special SPI
command. The SPI command selects the transmit
channel and provides the four bytes of data to be sent as
a 32-bit ARINC 429 message.
If the transmit channel’s sequencer is not running (ATCR
bit RUN/
repetition rate counter to rollover, then the new ARINC
429 message is transmitted without delay.
ARINC 429 Immediate Transmit Option
STOP
= “0”), or the sequencer is waiting for the
HOLT INTEGRATED CIRCUITS
HI-3200, HI-3201
31
If the transmit sequencer for the selected channel is
active, then the new message is transmitted as soon as
the current message has been sent. The sequencer then
resumes operation at the next location in the queue.
Both the RUN input and the Master Control Register
A429TX bit must be high to enable any ARINC 429
transmission.
Table 1 lists the host CPU SPI instruction format.