Cirrus-logic CobraNet User Manual Page 87

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CobraNet Programmer’s Reference
Management Interface Variable Reference
DS651PM25 ©Copyright 2006 Cirrus Logic, Inc. 87
Name
serialPPeriod
Description
Time in 256ths of a millisecond before a character received at the SCI port is placed in a packet and
transmitted. Shorter periods to achieve lower latency are appropriate for real time connections such
as MIDI. With higher settings more characters can be packed into a packet before it is transmitted
resulting in increased efficiency. Higher settings are recommended for bulk data transfer
applications.
The isochronous cycle period (1-1/3 mS) determines the minimum serialPPeriod. Setting
serialPPeriod below the isochronous cycle rate does not further improve responsiveness. The upper
limit of responsiveness can also affected by control channel accessibility and pipeline delays. The
depth of the receive SCI character queue in combination with the baud rate determines the
maximum allowed setting. The character buffer can accommodate 100 characters. This allows for
operation at the default 10ms period at a baud rate of 57,600. At this baud rate, larger settings will
result in buffer overflow and loss of data.
Host Address
0x24002
SNMP Object ID
1.3.6.1.4.1.2680.1.1.10.1.3
Type
Integer
Attributes
Read/write - Persistent
Default Value
2560 (10ms)
Implemented Version
2.4.7 (available via SNMP in 2.6.4)
Name
serialRxMAC
Description
MAC address of the CobraNet Interface from which SCI data will be accepted. This may be any
multicast address though 01:60:2B:FD:00:00 through 01:60:2B:FD:FF:FF have been reserved by
Cirrus Logic for use as "asynchronous global channels." ifPhysAddress is the only usable unicast
address (CobraNet does not support Ethernet promiscuous mode).
Host Address
0x24003
SNMP Object ID
1.3.6.1.4.1.2680.1.1.10.1.4
Type
PhysAddress
Attributes
Read/write - Persistent
Default Value
01:60:2B:FD:00:00
Implemented Version
2.4.7 (available via SNMP in 2.6.4)
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