VSC7440 datasheet(39/444 Pages) MICROSEMI

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Functional Descriptions

VMDS-10492 VSC7440 Datasheet Revision 4.2

The following table describes each field in the VStaX header.

Table 3 •

VStaX Header Fields

Field Category

Field Name

Bit

Width

Description

Reserved

RSV

1 bit

Reserved field. Must be set to 1 when injecting

frames and must be checked on extraction.

MISC when

ANA_AC:PS_COMMO

N.VSTAX2_MISC_ISD

X_ENA=1

COSID

78:76

3 bits

Class of service.

ISDX

75:64

12 bits

Ingress service index.

MISC when

ANA_AC:PS_COMMO

N.VSTAX2_MISC_ISD

X_ENA=0

RSV

78:68

11 bits

Reserved field. Must be set to 0 when injecting

frames from CPU and ignored on extraction.

67:64

4 bits

GLAG aggregation code

Reserved

RSV

63:62

2 bits

Reserved field. Must be set to 0.

QOS

CL_DP

60:61

2 bits

Classified drop precedence level.

1 bit

Super priority.

Identifies frames to be forwarded between CPUs

of neighboring units, using egress and ingress

super priority queues in the assembler and

disassembler.

CL_QOS (IPRIO)

58:56

3 bits

Classified quality of service value (internal

priority).

INGR_DROP_MOD

1 bit

Congestion management information.

0: Ingress front port is in flow control mode.

1: Ingress front port is in drop mode.

Reserved

RSV

1 bit

Reserved field. Must be set to 0.

General

RSV

1 bit

Reserved field. Must be set to 0.

TTL

52:48

5 bits

Time to live.

LRN_MODE

1 bit

0: Normal learning. SMAC and VID of the frame is

subject to learning.

1: Skip learning. Do not learn SMAC and VID of

the frame.

FWD_MODE

46:44

3 bits

Forward mode.

Encoding:

0x0: FWD_LLOOKUP: Forward using local lookup

in every unit.

0x1: FWD_LOGICAL: Forward to logical front port

at specific UPS.

0x2: FWD_PHYSICAL: Forward to physical front

port at specific UPS.

0x3: FWD_MULTICAST: Forward to ports part of

multicast group.

0x4: FWD_GMIRROR: Forward to global mirror

port.

0x5: FWD_GCPU_UPS: Forward to GCPU of

specific UPS.

0x6: FWD_GCPU_ALL: Forward to all GCPUs.

0x7: Reserved.

Reserved

RSV

1 bit

Reserved field. Must be set to 0.

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