VSC7440 datasheet(102/444 Pages) MICROSEMI

102 / 444 page

Functional Descriptions

VMDS-10492 VSC7440 Datasheet Revision 4.2

L3_FRAGMENT

Set if IPv4 frame is fragmented (More Fragments flag = 1 or

Fragments Offset > 0).

xxx

L3_FRAG_OFS_GT0

Set if IPv4 frame is fragmented but not the first fragment (Fragments

Offset > 0).

xxx

L3_OPTIONS

Set if IPv4 frame contains options (IP len > 5). IP options are not

parsed.

xxx

L3_DSCP

By default DSCP from frame. Per match, selectable to be current

classified DSCP (ANA_CL::ADV_CL_CFG.USE_CL_DSCP_ENA).

xxx

L3_IP4_DIP

IPv4 frames: Destination IPv4 address.

IPv6 frames: Destination IPv6 address, bits 31:0.

L3_IP4_SIP

Overloaded field for different frame types:

LLC frames (ETYPE_LEN=0 and IP_SNAP=0):

L3_IP4_SIP = [CTRL, PAYLOAD[0:2]]

SNAP frames (ETYPE_LEN=0 and IP_SNAP=1):

L3_IP4_SIP = [PID[2:0], PAYLOAD[0]]

IPv4 frames (ETYPE_LEN=1, IP_SNAP=1, and IP4=1):

L3_IP4_SIP = source IPv4 address

IPv6 frames (ETYPE_LEN=1, IP_SNAP=1, IP4=0):

L3_IP4_SIP = source IPv6 address, bits 31:0

Other frames (ETYPE_LEN=1, IP_SNAP=0):

L3_IP4_SIP = PAYLOAD[0:3]

Note that, optionally, L3_IP4_SIP may contain the destination IP

address for IP frames. See DST_ENTRY.

xxx

L3_IP_PROTO

IPv4 frames (IP4=1): IP protocol.

IPv6 frames (IP4=0): Next header.

TCP_UDP

Frame type flag indicating the frame is a TCP or UDP frame.

Set if frame is IPv4/IPv6 TCP or UDP frame (IP protocol/next header

equals 6 or 17).

Overloading: Set to 1 for OAM Y.1731 frames.

xxx

TCP

Frame type flag indicating the frame is a TCP frame.

Set if frame is IPv4 TCP frame (IP protocol = 6) or IPv6 TCP frames

(Next header = 6).

xxx

Table 62 •

VCAP CLM X8 Key Details (continued)

Field Name

Description

Size

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