Cirrus Logic CobraNet - Manual (Page 5)

CobraNet Programmer’s Reference
Table of Contents
DS651PM26
©
Copyright 2006 Cirrus Logic, Inc. 5
Table of Contents
Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
General Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1. Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
1.1 CobraNet Terminology ........................................................................................................ 7
1.2 Protocol ............................................................................................................................... 9
1.2.1 Beat Packet......................................................................................................... 9
1.2.2 Isochronous Data Packet (or Bundle) ................................................................. 9
1.2.3 Reservation Packet ............................................................................................. 9
1.2.4 Serial Bridge Packet............................................................................................ 9
1.3 Timing and Performance................................................................................................... 10
1.4 Bundle Addressing types .................................................................................................. 11
2. Control Communications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
2.1 Serial Bridge...................................................................................................................... 12
2.2 Packet Bridge.................................................................................................................... 13
2.2.1 Packet Bridge Buffer Data Format .................................................................... 13
Processor-dependent Layout of Packet Bridge Buffers.............................. 13
24-bit HMI Packet Bridge Buffer Data Format ............................................ 14
32-bit HMI Packet Bridge Buffer Data Format ............................................ 14
2.2.2 Packet Bridge Receive Filtering ........................................................................ 15
3. Network Stack . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
3.1 CobraNet Audio................................................................................................................. 16
3.2 Serial Bridge...................................................................................................................... 16
3.3 Packet Bridge.................................................................................................................... 16
3.4 BOOTP.............................................................................................................................. 16
3.5 RARP (partial support) ...................................................................................................... 17
3.6 ICMP (partial support) ....................................................................................................... 17
3.7 ARP................................................................................................................................... 17
3.8 IP....................................................................................................................................... 17
3.9 UDP................................................................................................................................... 18
3.10 TFTP ............................................................................................................................... 18
3.11 SNMP.............................................................................................................................. 18
4. Audio Paths . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
4.1 Audio Routing Channels ................................................................................................... 19
4.2 Bundle Transmitters .......................................................................................................... 20
4.3 Bundle Receivers .............................................................................................................. 20
4.4 Loopback........................................................................................................................... 20
4.5 Output Channel Duplication .............................................................................................. 20
4.6 Meters ............................................................................................................................... 21
4.7 Low-latency Audio Support ............................................................................................... 21
4.8 96 kHz Sample Rate Support............................................................................................ 23
5. Management Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
5.1 Flash ................................................................................................................................. 25
5.2 Persistence ....................................................................................................................... 26
5.3 Watch Dog ........................................................................................................................ 26
5.4 SNMP Extension Agent..................................................................................................... 27
6. Management Interface Variable Reference. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
6.1 Legend .............................................................................................................................. 28
6.2 Data Types........................................................................................................................ 29
6.2.1 DisplayString ..................................................................................................... 29
6.2.2 OID.................................................................................................................... 29
6.2.3 IpAddress .......................................................................................................... 29
6.2.4 PhysAddress ..................................................................................................... 30
6.2.5 TimeTicks.......................................................................................................... 30