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KSZ8842-PMQL

2-Port Ethernet Switch with PCI Interface

Micrel 

Micrel, Inc.

KSZ8842-PMQL/PMBL

Features

Switch Management

• Non-blocking switch fabric assures fast packet delivery

by utilizing a 1K entry MAC Address look-up engine and

a store-and-forward architecture

• Fully compliant with IEEE802.3u standards

• Full-duplex IEEE 802.3x flow control (Pause) with force

mode option

• Half-duplex back pressure flow control

Advanced Switch Management

• IEEE 802.1Q VLAN support for up to 16 groups (full-

range of VLAN IDs)

• VLAN ID tag/untag options, per port basis

• IEEE 802.1p/Q tag insertion or removal on a per-port

basis (egress)

• Programmable rate limiting at the ingress and egress

port

• Broadcast storm protection

• IEEE 802.1d spanning tree protocol support

• MAC filtering function to filter unicast packets

• Unknown MAC address forwarding function

• Direct forwarding mode enabling the processor to

identify the ingress port and to specify the egress port

• IGMP v1/v2 snooping support for multicast packet

filtering

• IPV6 Multicast Listener Discovery (MLD) snooping

support

Monitoring

• Port mirroring/monitoring/sniffing: ingress and/or egress

traffic to any port

• Management information base (MIB) counters for fully

compliant statistics gathering: 32 MIB counters per port

• Loop back modes for remote failure diagnostics

Comprehensive Register Access

• There are three kinds of register groups:

• The PCI configuration registers are used to initialize

and configure the PCI interface

• The PCI control/status registers are used to

communicate between the host and KSZ8842-

PMQL/PMBL

• Switch registers are used to support transceiver control

and status. They are configurable on-the-fly (port-

priority, 802.1p/d/Q, etc.)

QoS/CoS Packets Prioritization Support

• Per port, 802.1p and DiffServ based

• Re-mapping of 802.1p priority field on a per port basis

Power Modes, Packaging, and Power Supplies

• Full-chip hardware power-down (register configuration

not saved) provides for low power dissipation

• Per port-based software power-save on PHY (idle link

detection, register configuration preserved)

• Single power supply: 3.3V

• Commercial Temperature Range: 0°C to +70°C

• Industrial Temperature Range: –40°C to +85°C

• Available in 128-pin PQFP and 100-ball LFBGA

Additional Features

In addition to offering all of the features of an integrated

Layer-2 managed switch, the KSZ8842-PMQL/PMBL

offers:

• Repeater mode capabilities to allow for cut through in

latency critical Industrial Ethernet or Embedded

Ethernet applications

• Dynamic buffer memory scheme essential for

applications such as Video over IP where image jitter is

unacceptable

• 2-Port switch with a 32-bit/33MHz PCI processor

interface.

• Micrel LinkMD® cable diagnostics to determine cable

length, diagnose faulty cables, and determine distance-

to-fault

• Hewlett Packard (HP) Auto MDI-X crossover with

disable and enable options

• Four priority queues to handle voice, video, data, and

control packets

• Ability to transmit and receive jumbo frame sizes up to

1916 bytes

Applications

• Video Distribution Systems

• High-end Cable, Satellite, and IP set-top boxes

• Video over IP

• Voice over IP (VoIP) and Analog Telephone Adapters

(ATA)

• Industrial Control in Latency Critical Applications

• Motion Control

• Industrial Control Sensor Devices (Temperature,

Pressure, Levels, and Valves)

• Security and Surveillance Cameras

Markets

• Fast Ethernet

• Embedded Ethernet

• Industrial Ethernet

October 2007

2

M9999-100207-1.5

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