hi-3200 Holt Integrated Circuits, Inc., hi-3200 Datasheet - Page 34

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

Type 1 CAN Transmit Descriptor Frame Format
Type 1 CAN transmit descriptors are used when transmitting frames using CAN Identifier and Data payload values
defined explicitly by the HI-3200 Host CPU or Auto-initialization EEPROM.
The descriptor format is as follows:
CAN TRANSMIT DESCRIPTOR HEADER BYTE
NOTE: Bit 7 should be set to the value of the reserved bit “r1” of the CAN frame.
Type
00
01
01
10
10
11
11
RTR
X
0
1
0
1
0
1
NNNN
NNNN
NNNN
XXXX
XXXX
XXXX
XXXX
DLC
Description
End of sequence marker.
Type 1 descriptor CAN Data frame. Data Length Code (DLC) indicates the number of data bytes
in the CAN frame 0 - 8. DLC values >8 always have eight data bytes. The number of descriptor
bytes D is given by D=1+(4+N),where N is the DLC value or 8 if DLC>8.
Type 1 descriptor CAN Remote frame. The number of bytes in the descriptor is 5.
Type 2 descriptor CAN Data frame. The number of descriptor bytes is D=2+(2 x N), where N is the
DLC value or 8 if DLC>8.
Type 2 descriptor CAN Remote Frame. The number of descriptor bytes is 2.
Type 3 descriptor CAN Data frame. The number of descriptor bytes is D=9+(2 x N), where N is the
DLC value or 8 if DLC>8.
Type 3 descriptor CAN Remote frame. The number of descriptor bytes is 9.
ID20 to ID18, SRR, IDE, ID17 to ID15
Type 1 Descriptor Header Byte
HOLT INTEGRATED CIRCUITS
CAN Data Byte 1
CAN Data Byte n
ID6 to ID0, r0
ID14 to ID7
ID28 to ID21
HI-3200, HI-3201
34
MSB
r1
7
6
Type
5
}
4
0 - 8 Bytes
3
2
DLC
1
LSB
0