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
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