VSC7440 datasheet(108/444 Pages) MICROSEMI

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Functional Descriptions

VMDS-10492 VSC7440 Datasheet Revision 4.2

L3_IP6_SIP

Overloaded field for different frame types:

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

L3_IP6_SIP = [CTRL, PAYLOAD[0:14]]

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

L3_IP6_SIP = [PID[2:0], PAYLOAD[0:12]]

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

L3_IP6_SIP[31:0] = source IPv4 address

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

L3_IP6_SIP = source IPv6 address

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

L3_IP6_SIP = PAYLOAD[0:15]

128

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.

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).

L4_SPORT

TCP/UDP source port.

Overloading:

OAM Y.1731 frames: L4_SPORT = OAM MEL flags, see below. TCP_UDP

is at the same time set to 1 to indicate the overloading.

OAM MEL flags:

Encoding of MD level/MEG level (MEL). One bit for each level where

lowest level encoded as zero.

The following keys can be generated:

MEL=0: 0b0000000

MEL=1: 0b0000001

MEL=2: 0b0000011

MEL=3: 0b0000111

MEL=4: 0b0001111

MEL=5: 0b0011111

MEL=6: 0b0111111

MEL=7: 0b1111111

Together with the mask, the following kinds of rules may be created:

Exact match. Fx. MEL=2: 0b0000011

Below. Fx. MEL<=4: 0b000XXXX

Above. Fx. MEL>=5: 0bXX11111

Between. Fx. 3<= MEL<=5: 0b00XX111,

where ‘X’ means don’t care.

Table 63 •

VCAP CLM X16 Key Details (continued)

Field Name

Description

Size

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