AR8327-AL1A-R datasheet(164/394 Pages) ETC2

164 / 394 page

164 • AR8327/AR8327N Seven-port Gigabit Ethernet Switch

Atheros Communications, Inc.

164 • June 2011

COMPANY CONFIDENTIAL

R/W

1'b0

PORT_LOOPBACK_E

N_5

1'b1: LOOP BACK. Packet sent in from this port

will be sent out from the same port. This packet

will not sent to other ports

1'b0: NORMAL FORWARDING

R/W

1'b1

LEARN_EN_5

Enable learn operation.

1'b1: enable hardware learn new MAC address into

ARL table.

1'b0: won't learn new MAC address to ARL table

R/O

RESERVED

18:16

R/O

3'h4

PORT_STATE_5

Port State. These bits are used to manage the port

to determine what kind of frames are allowed to

enter or leave the port for simple bridge loop

detection or 803.1D Spanning Tree.

3'b000: Disable mode. The port is completely

disable, and can't receive or transmit any frames.

3'b001: Blocking Mode. In this state, the port

forwards received management frames to the

designed port only. Any other frames can't be

transmitted or received by the port, and without

learning any SA address.

3'b010: Listening Mode. In this state, the port will

receive and transmit only management frames, but

without learning any SA address. Any other

frames can't be transmitted or received by the port.

3'b011: Learning Mode. In this state, the port will

learning all SA, and discard all frames except

management frames, and only management

frames allowed to be transmitted out.

3'b100: Forward Mode. In this state, the port will

learning all SA, transmit and receive all frames like

normal.

R/O

RESERVED

14:12

R/O

RESERVED

R/W

RESERVED

R/W

FORCE_PORT_VLAN

_EN_5

1'b1: force to use port base vlan enable. If this bit is

set to 1'b1, use port base vlan & vlan table result to

determine destination port.

9:8

R/W

2'0

VLAN_MODE_5

802.1Q mode for this port.

2'b00: 802.1Q disable. Use port base VLAN only.

2'b01: fallback. Enable 802.1Q for all received

frames. Don't discard ingress membership

violation and use the port base VLAN if the

frame's VID isn't contained in VLAN Table.

2'b10: check. Enable 802.1Q for all received frames.

Don't discard ingress membership violation but

discard frames which VID isn't contained in VLAN

Table.

2'b11: secure. Enable 802.1Q for all received frames.

Discard frames with ingress membership violation

or whose VID isn't contained in the VLAN Table.

Bit

R/W

Inital

Value

Mnemonic

Description

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