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: 0oC to +70oC
• Industrial Temperature Range: 40oC to +85oC (see Ordering Information)
• Available in 128-pin PQFP (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 bytesApplication• 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 CamerasPinout
Specifications
| Description |
Pins |
Value |
| Supply Voltage |
VDDATX, VDDARX, VDDIO |
-0.5V to 4.0V |
| Input Voltage |
All Inputs |
-0.5V to 5V |
| Output Voltage |
All Outputs |
-0.5V to 4.0V |
| Lead Temperature (soldering, 10 sec) |
N/A |
- |
| Storage Temperature (Ts) |
N/A |
-55 to 150 |
DescriptionThe 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.
The KSZ8842M is the industry's first fully managed, 2-port switch with a non-PCI CPU interface. It is based on a proven, 4th generation, integrated Layer-2 switch, compliant with IEEE 802.3u standards. Also an industrial temperature grade version of the KSZ8842, the KSZ8842MQLI, can be ordered (see Ordering Information).
The KSZ8842M can be configured as a switch or as a low-latency ( 310 nanoseconds) repeater in latency-critical, embedded or industrial Ethernet applications. For industrial applications, the KSZ8842M can run in half-duplex mode regardless of the application.
The KSZ8842M offers an extensive feature set that includes tag/port-based VLAN, quality of service (QoS) priority management, management information base (MIB) counters, and CPU control/data interfaces to effectively address Fast Ethernet applications.
The KSZ8842M contains: Two 10/100 transceivers with patented, mixed-signal, low-power technology, two media access control (MAC) units, a direct memory access (DMA) channel, a high-speed, non-blocking, switch fabric, a dedicated 1K entry forwarding table, and an on-chip frame buffer memory.
KSZ8842-16 Data Sheet
