AR8327-AL1A-R datasheet(25/394 Pages) ETC2

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Atheros Communications, Inc.

AR8327/AR8327N Seven-port Gigabit Ethernet

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2.2.1

Transmit

The AR8327 will send out the frame with Atheros Header when header is enabled. The header will

indicate the source port of the frame and frame type and priority. The detail format of Atheros Header

is shown in Table 2-2.

2.3 Receive

The AR8327 will recognize the Atheros Header on receive when the header is enabled. The format is

depicted in Table 2-3.

5'h18

Mirror to CPU

Acl_mirror_to_CPU,

arl_mirror_to_CPU, port_mirror_to_CPU,

offload match mirror

5'h19

Flooding to CPU

Broadcast flooding to CPU,

unknown unicast/multicast flooding to CPU

5'h1A

Forwarding to CPU

Bridging to CPU(ARL DP),

Routing to CPU (offload match),

IGMP hardware join/leave forwarding to CPU, Special DIP

Header/ACL assigned DP

Table 2-2.

Atheros Header Transmit Format Detail

Bits

Name

Description

15:14

Version

The value is 2'b10.

13:11

priority

Frame priority.

10:6

Type

Frame Type, the next table shows the detail.

5:4

reserved

Frame_with_tag

The ingress frame is Tagged.

2:0

Source_port_num

The ingress port number.

Table 2-3.

Atheros Header Receive

Bit

Name

Description

15:14

version

The version must be 2'b10

13:11

priority

10:8

0: normal

1: Read/write reg

2: Disable learn

3: Disable offload

4: Disable Learn & offload

From_cpu

The bit indicates the forwarding method.

1'b1: The forwarding is based on DP_bit_map and bypass lookup.

1'b0: The forwarding is based on the lookup result.

6:0

DP_bit_map

These bits indicates the forwarding port map. See the description in the

bit From_cpu.

Table 2-1.

Atheros Header Type

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