General Description
The KSZ8842-series of 2-port switches includes PCI and non-PCI CPU interfaces. This datasheet describes the KSZ8842-PMQL/PMBL PCI CPU interface chips. KSZ8842-PMQL is PQFP package chip, KSZ8842-PMBL is LFBGA package chip. For information on the KSZ8842-MQL/MBL CPU non-PCI interface switches, refer to the KSZ8842-MQL/MBL datasheet.

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 (fullrange 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 (portpriority, 802.1p/d/Q, etc.)
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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