Description

The KSZ8842-16MBL is a 2-port switch that includes PCI and non-PCI CPU interfaces. It is available in 8/16-bit and 32-bit bus designs. This datasheet specifically describes the KSZ8842M-series of non-PCI CPU interface chips. It is fully compliant with IEEE 802.3u standards and supports both full-duplex IEEE 802.3x flow control and half-duplex back pressure flow control.

Specifications and features

• Switch Management
• Non-blocking switch fabric with a 1K entry forwarding table
• IEEE 802.3u standards compliance
• 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
• 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
• Available in 128-pin PQFP and 100-ball LFBGA
• Available in –16 version for 8/16-bit bus support and – 32 version for 32-bit bus support
• Additional Features
• Repeater mode capabilities for cut through in latency critical industrial Ethernet or embedded Ethernet applications
• Dynamic buffer memory scheme
• 2-port switch with a flexible 8, 16, or 32-bit generic host processor interfaces
• Micrel LinkMD™ cable diagnostics
• 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

Application Scenarios

• 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

Comparison

Advantages
• Non-blocking switch fabric for fast packet delivery
• Supports IEEE 802.3u standards
• Flexible VLAN support
• Programmable rate limiting
• Broadcast storm protection
• Supports MAC filtering
• Supports IEEE 802.1d spanning tree protocol
• Supports port mirroring/monitoring/sniffing
• Comprehensive register access
• Supports QoS/CoS packets prioritization
• Various power modes and packaging options
• Additional features including repeater mode, dynamic buffer memory, and cable diagnostics
Disadvantages
• No specific disadvantages mentioned