AR8327-AL1A-R datasheet(23/394 Pages) ETC2

23 / 394 page

Atheros Communications, Inc.

AR8327/AR8327N Seven-port Gigabit Ethernet

Switch

•

23

2. Functional Description

The AR8327 supports many operating modes that can be configured using a low-cost serial EEPROM

and/or the MDC/MDIO interface. The AR8327 also supports a CPU header mode that appends two

bytes to each frame.

The CPU can deheader frame with header to configure the switch register, the address lookup table,

and VLAN and receive auto-cast MIB frames. The sixth port (port5) supports a PHY interface as a

WAN port. The first port (port0) supports a MAC interface and can be configured in MII-PHY or

RMII-PHY mode to connect to an external management CPU or an integrated CPU in a routing or

xDSL engine.

The AR8327 contains a 2 K-entry address lookup table that employs three entries per bucket to avoid

hash collision and maintain non-blocking forwarding performance. The table provides read/write

accesses from the serial and CPU interfaces; each entry can be configured as a static entry. The AR8327

supports 4K VLAN entries configurable as port-based VLANs or 802.1Q tag-based VLANs.

To provide non-blocking switching performance in all traffic environments, the AR8327 supports

several types of QoS function with four-level priority queues based on port, IEEE 802.1p, IPv4 DSCP,

IPv6 TC, 802.1Q VID, or MAC address. Back pressure and pause frame-based flow control schemes are

included to support zero packet loss under temporary traffic congestion.

Meeting today’s service provider requirements, the AR8327 switch uses the latest Atheros QoS switch

architecture that supports ingress policing and egress rate limiting. The AR8327 device supports IPv4

IGMP snooping and IPv6 MLD snooping to significantly improve the performance of streaming

media and other bandwidth-intensive IP multicast applications.

IEEE 802.3x full duplex flow control and back-pressure half duplex flow control schemes are

supported to ensure zero packet loss during temporary traffic congestion.

A broadcast storm control mechanism prevents the packets from flooding into other parts of the

network. The AR8327 device has an intelligent switch engine to prevent Head-of-Line blocking

problems on per-CoS basis for each port.

2.1 Applications

2.1.1

AP Router Application

Figure 2-1 shows the block diagram for an AP router application. This solution is a complete end-to-

end 802.AP RJ-45-to-air router 802.11n wireless network processing solution. The AR8327 eliminates

the external PHY for the WAN interface. Note that the AR8327 can also work as a one-arm router.

Figure 2-1.

AP Router Application

WASP

High

Performance

Wifi SoC

RGMII

S17

7-Port

Giga

Ethernet

Switch

MAC 0

PHY 0

PHY 1

PHY 2

PHY 3

LAN

WAN

NAS

Printer

DSL

Modem

RJ11

PHY 4

MAC 6

HomePlug /

HomePNA/

MoCA

xMII

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