VSC7440 datasheet(171/444 Pages) MICROSEMI

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Functional Descriptions

VMDS-10492 VSC7440 Datasheet Revision 4.2

154

ETYPE

Frame’s EtherType

Overloading:

OAM Y.1731 frames: ETYPE[6:0] contains OAM

MEL flags, see below. OAM_Y1731 is set to 1 to

indicate the overloading of ETYPE.

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.

IP4

Frame type flag indicating the frame is an IPv4

frame.

Set if frame is IPv4 frame (EtherType = 0x800 and

IP version = 4)

1x x

L2_PAYLOAD_ETYPE

Byte 0-7 of L2 payload after Type/Len field.

Overloading:

OAM Y.1731 frames (OAM_Y1731 = 1):

Bytes 0-3: OAM PDU bytes 0-3

Bytes 4-5: OAM_MEPID

Bytes 6-7: Unused.

L3_FRAGMENT

Set if IPv4 frame is fragmented (more fragments

flag = 1 or fragments offset > 0).

1x x

L3_FRAG_OFS_GT0

Set if IPv4 frame is fragmented but not the first

fragment (fragments offset > 0)

1x x

ARP_ADDR_SPACE_OK

Set if hardware address is Ethernet.

ARP_PROTO_SPACE_OK Set if protocol address space is 0x0800.

ARP_LEN_OK

Set if Hardware address length = 6 (Ethernet) and

IP address length = 4 (IP).

ARP_TARGET_MATCH

Target Hardware Address = SMAC (RARP).

ARP_SENDER_MATCH

Sender Hardware Address = SMAC (ARP).

Table 96 •

VCAP IS2 Key Overview (continued)

Field Name

Description

Size

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