General Description

The KSZ8842-series of 2-port switches includes PCI and non-PCI CPU interfaces, and are available in 8/16-bit and 32-bit bus designs (see Ordering Information). This datasheet describes the KSZ8842M-series of non-PCI CPU interface chips. For information on the KSZ8842 PCI CPU interface switches, refer to the KSZ8842P datasheet.

Features

Switch Management

• Non-blocking switch fabric assures fast packet delivery by utilizing a 1K entry forwarding table

• Fully compliant with IEEE 802.3u 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, on a 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 ports

• Broadcast storm protection

• IEEE 802.1d spanning tree protocol support

• MAC filtering function to filter or forward unknown unicast packets

• Direct forwarding mode enabling the processor to identify the ingress port and to specify the egress port

• Internet Group Management Protocol (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

• MIB counters for fully compliant statistics gathering – 34 MIB counters per port

• Loopback modes for remote failure diagnostics

Comprehensive Register Access

• Control registers configurable on-the-fly (port-priority, 802.1p/d/Q)

QoS/CoS Packets Prioritization Support

• Per port, 802.1p and DiffServ-based

• Remapping 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) allows 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 (see Ordering Information)

• Available in 128-pin PQFP and 100-ball LFBGA (optional package: 128-pin LQFP)

• Available in –16 version for 8/16-bit bus support and – 32 version for 32-bit bus support (see Ordering Information).

Additional Features

In addition to offering all of the features of an integrated Layer-2 managed switch, the KSZ8842M 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 flexible 8, 16, or 32-bit generic host processor interfaces

• Micrel LinkMD™ cable diagnostics to determine cable length, diagnose faulty cables, and determine distance-to-fault

• Hewlett Packard (HP) Auto-MDIX 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