Cirrus-logic CobraNet User Manual Page 14
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14 ©Copyright 2006 Cirrus Logic, Inc. DS651PM25
CobraNet Programmer’s Reference
Control Communications
2.2.1.2. 24-bit HMI Packet Bridge Buffer Data Format
Packet byte length is specified in the two MS bytes of the first word. The LS bytes will read
0 on receipt and must be set to 0 for transmit. Transmit byte length is rounded up to the
nearest even multiple of 4. Receive byte length indicates the actual number of bytes
received.
2.2.1.3. 32-bit HMI Packet Bridge Buffer Data Format
Packet data begins with the second word. Transmission order of each word is MH, MS,
LS, ML.
Table 3. Packet Bridge Buffer Layout, 24-bit Platforms
MS Middle LS
Word 1
Packet byte length MS Packet byte length LS unused/0
Word 2
Destination MAC byte 2 Destination MAC byte 3 unused/0
Word 2
Destination MAC byte 4 Destination MAC byte 3 unused/0
Word 3
Destination MAC byte 6 Destination MAC byte 5 unused/0
Word 4
Source MAC byte 2 Source MAC byte 1 unused/0
Word 5
Source MAC byte 4 Source MAC byte 3 unused/0
Word 6
Source MAC byte 6 Source MAC byte 5 unused/0
Word 7
Protocol identifier LS Protocol identifier MS unused/0
Word 8
Payload byte 2 Payload byte 1 unused/0
...
... ... unused/0
Word n
Payload byte n Payload byte n-1 unused/0
Table 4. Packet Bridge Buffer Layout, 32-bit Platforms
MS MH ML LS
Word 1
Byte length MS Byte length LS unused/0 unused/0
Word 2
Destination MAC byte 2 Destination MAC byte 1 Destination MAC byte 4 Destination MAC byte 3
Word 3
Destination MAC byte 6 Destination MAC byte 5 Source MAC byte 1 Source MAC byte 2
Word 4
Source MAC byte 4 Source MAC byte 3 Source MAC byte 6 Source MAC byte 5
Word 5
Protocol identifier LS Protocol identifier MS Payload byte 2 Payload byte 1
Word 6
Payload byte 4 Payload byte 3 Payload byte 6 Payload byte 5
...
... ... ... ...
Word n
Payload byte n-2 Payload byte n-3 Payload byte n Payload byte n-1
- CobraNet 1
- Features 2
- General Description 3
- Table of Contents 5
- Table of Contents 6
- 1. Overview 7
- Overview 8
- 1.2 Protocol 9
- 1.3 Timing and Performance 10
- 1.4 Bundle Addressing types 11
- 2. Control Communications 12
- 2.2 Packet Bridge 13
- 3. Network Stack 16
- 3.5 RARP (partial support) 17
- 3.6 ICMP (partial support) 17
- 3.10 TFTP 18
- 3.11 SNMP 18
- 4. Audio Paths 19
- 4.2 Bundle Transmitters 20
- 4.3 Bundle Receivers 20
- 4.4 Loopback 20
- 4.6 Meters 21
- Latency 22
- Channels per Bundle 22
- 5. Management Interface 25
- 5.2 Persistence 26
- 5.3 Watch Dog 26
- 5.4 SNMP Extension Agent 27
- 6.1 Legend 28
- 6.2 Data Types 29
- 6.2.4 PhysAddress 30
- 6.2.5 TimeTicks 30
- 6.2.6 Counter 31
- 6.2.7 Counter2 31
- 6.2.8 Integer 31
- 6.2.9 Integer16 32
- 6.2.10 Integer48 32
- 6.3 MIB-II Variables 33
- 6.3.2 Interface 37
- 6.3.3 Address Translation 45
- 6.3.4 IP 46
- 6.3.5 UDP 53
- 6.3.6 SNMP 55
- 6.4 CobraNet Variables 65
- 6.4.2 Hardware Identification 68
- 6.4.3 Flash 69
- 6.4.4 Errors 74
- 6.4.5 Conductor 77
- 6.4.6 Conductor Information 79
- 6.4.7 Packet Bridge 81
- 6.4.8 Serial Bridge 86
- 6.4.9 Interrupt Control 89
- 6.4.10 Audio 92
- 6.4.11 Receivers 101
- 6.4.12 Transmitters 105
- 6.4.13 Synchronization 110
- 6.4.14 SNMP Monitor 113
- 6.4.15 MI Monitor 114
- 6.4.16 IP Monitor 116
- 6.4.17 IF Monitor 117
- 6.5 DSP Extensions 119
- SNMP Object ID 120
- 7.1.1 Audio I/O Map 122
- 7.1.2 Bundle Assignments 122
- 7.2 Conductor Priority 123
- 7.3 Name 123
- 8. Error Reporting 124
- 8.2.2 POST Failure 125
- 9. Error Code Reference 126
- 9.2 Error Code Interpretation 127
- 9.3 Error Codes Listing 128
- 10. Glossary of Terms 141
- Glossary of Terms 142
- Unicast Bundle 146
- Unregulated Traffic 146
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