hi-3200 Holt Integrated Circuits, Inc., hi-3200 Datasheet - Page 20

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

The HI-3200 includes an ARINC 429 loop-back feature,
which allows users to exercise the ARINC 429 transmit and
receive channels for self-test purposes. The ARINC 429
Loop-Back register, ALOOP defines which receiver
channels are in loop-back mode. When a “1” is
programmed in the ALOOP bit position for a receiver, then
its ARINC 429 bus connection to the external pins is broken
and instead the input is connected to one of the four ARINC
429 transmit channels. Transmit channel 0 is connected to
receive channel 0 and 1, transmit channel 1 is connected to
receive channels 2 and 3, and so on.
ARINC 429 FIFO Threshold Value Register
ARINC 429 Loop-back Self-Test
Threshold Value
Bit Name
7
6
5
4
3
2
1
0
FIFO THRESHOLD VALUE
(Address 0x8021)
ARINC 429 LOOPBACK
(Address 0x8022)
00000
00001
00010
00011
10000
11111
ALOOP7
A
A
A
A
A
A
A
LOOP
LOOP
LOOP
LOOP
LOOP
LOOP1
LOOP0
6
5
4
3
2
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Description
Threshold flag is set if at least 1 message is in FIFO (Same as FIFO NOT EMPTY FLAG)
Threshold flag is set if more than one message are in the FIFO
Threshold flag is set if more than two messages are in the FIFO
Threshold flag is set if more than three messages are in the FIFO
Threshold flag is set if more than sixteen messages are in the FIFO (default)
Threshold flag is set if 32 messages are in the FIFO (Same as FIFO FULL FLAG)
Default Description
0
0
0
0
0
0
0
0
This bit is set to “1” to loop-back transmit channel 3 to receiver 7
This bit is set to “1” to loop-back transmit channel 3 to receiver 6
This bit is set to “1” to loop-back transmit channel 2 to receiver 5
This bit is set to “1” to loop-back transmit channel 2 to receiver 4
This bit is set to “1” to loop-back transmit channel 1 to receiver 3
This bit is set to “1” to loop-back transmit channel 1 to receiver 2
This bit is set to “1” to loop-back transmit channel 0 to receiver 1
This bit is set to “1” to loop-back transmit channel 0 to receiver 0
MSB
MSB
0
7
7
0
6
6
HOLT INTEGRATED CIRCUITS
0
5
5
4
4
HI-3200, HI-3201
3
3
Threshold
2
2
1
1
20
LSB
LSB
0
0
When in loop-back mode, incoming ARINC 429 messages
are ignored by the HI-3200. When running in loop-back
mode the ARINC 429 transmit pins may be disabled by
pulling the TXMSK input high. This prevents test messages
from being output to the external ARINC 429 transmit
buses.
Default = 0x10