hi-3200 Holt Integrated Circuits, Inc., hi-3200 Datasheet - Page 37

• 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
CAN frame immediately using a special SPI command.
The SPI command describes the CAN frame with 5 to 13
SPI data bytes. The bit format of the data bytes is exactly
the same as a Type 1 transmit descriptor, except the
Type Field of the header byte is “don’t care”.
If the CAN transmit sequencer is not running (CTCR bit
RUN/
repetition rate counter to rollover, then the new CAN
frame is transmitted without delay.
CAN Bus Immediate Transmit Option
STOP
= “0”), or the sequencer is waiting for the
HOLT INTEGRATED CIRCUITS
HI-3200, HI-3201
37
If the CAN transmit sequencer is active, then the new
frame is transmitted to HI-3110 as soon as the current
frame has been sent. The sequencer then resumes
operation at the next location in the queue.
Both the RUN input pin and the Master Control Register
CANTX bit must be high to enable any CAN frame
transmission.
Table 1 lists the host CPU SPI instruction format.