TC9205M
Preliminary Data Sheet
10.3.13
CoS Configuration Register
Confidential.
39/51
July 30, 2003
Copyright © 2003, IC Plus Corp.
TC9205M-DS-R03
- Address: 47h
7 6 5 4 3 2 1 0
EnIPPr
EnVLANPr
CosResolution
VLANPrec
DefCoS
not used
CosConfig
Bit(s)
Field
Description
0
EnIPPr
Enable IP priority
1
EnVLANPr
Enable VLAN priority
2
CoSResolution
CoS Resolution Mode
3
VLANPrec
VLAN Precedence
5 - 4
DefCoS
Default Class of Service
7 - 6
not used
not used
EnIPPr
Setting this field to ‘1’ will enable IP prioritization. CoS resolution function will
consider TOS Precedence bits from IP Header. Default value is its corresponding
EnIPPr pin value.
EnVLANPr
Setting this field to ‘1’ will enable VLAN prioritization. CoS resolution function will
consider user-priority bits (TCI field) from 802.1Q VLAN Tag Header. Default value
is its corresponding EnVLANPr pin value.
CoSResolution
When this bit is set to ‘0’ the CoS resolution function will assign to each frame the
highest CoS obtained from all enabled prioritization sources.
Setting this field to ‘1’, the resolution function will perform a prioritized parsing of
CoS sources, depending of VLANPrec bit. The CoS will be assigned considering
the first source that has been found within the frame (VLAN or IP). If none of the
VLAN or IP prioritization sources have been found then the port based prioritization
is considered if enabled, otherwise the frame will be assigned the default CoS.
Default is ‘1’.
VLANPrec
If CoSResolution field is set to ‘0’, this field is meaningless. When CoSResolution
field is set to ‘1’, this field will set the prioritization sources precedence for the
resolution function. A value of ‘1’ will set the following precedence (from highest to
lowest): VLAN priority, IP priority, port priority. A value of ‘0’ will set the following
precedence (from highest to lowest): IP priority, VLAN priority, port priority. Default
is ‘0’.
DefCoS
This is the CoS a frame will receive when port based prioritization is disabled and
both VLAN and IP headers are not found (or the corresponding VLAN / IP
prioritizations are also disabled). This configuration can be used especially when
CoSResolution setting is ‘0’. Default is “01” (CoS 1).
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