KS8842-16MQL

www.micrel.com KS8842-16MQL KS8842-32MQL Product Brief 2-Port Ethernet Switch with Non-PCI Interface Description The KS8842M is the industry’s first fully managed 2-port switch with a non-PCI CPU interface. The KS8842 is a proven, 4th generation, integrated Layer 2 switch that is compliant to the IEEE 802.3u standard. The KS8842M can also be configured as a low-latency repeater to allow for ‘cut thru’ in latency critical Embedded or Industrial Ethernet applications. For industrial automation applications in the repeater mode, the KS8842M runs in half-duplex mode regardless of the application. The KS8842M offers an extensive feature set that includes tag/port-based VLAN, QoS priority management, MAC filtering function, MIB counters, and CPU control/data interfaces to effectively address both current and emerging Fast Ethernet applications. The KS8842 contains two 10/100 transceivers with patented mixed-signal low-power technology, two media access control (MAC) units and 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. Benefits Offers all of the features of an integrated Layer 2 managed switch plus: • Fully compliant to the IEEE 802.3u standard • Repeater mode capabilities to allow for ‘cut-thru’ in latency critical Industrial Ethernet or Embedded Ethernet applications • MAC filtering function to filter unicast packets • Dynamic buffer memory scheme – Essential for applications such as Video over IP where image jitter is unacceptable • 2-Port switch with flexible 8/16/32 bit generic host processor interface • Micrel LinkMDTM cable diagnostic capabilities to determine cable length, diagnose faulty cables, and determine distance to fault • HP Auto MDI-X crossover with disable and enable option • Industrial Temperature support: –40oC to +85oC available from Q4 • Four priority queues to handle voice, video, data, and control packets Block Diagram HP Auto MDI/MDI-X 1K Look-Up Engine 10/100 T/TX PHY 1 10/100 MAC 1 Applications • Industrial applications for daisy chaining multiple devices • Industrial control in latency critical applications • Port redundancy and port monitoring • Security cameras • VoIP phone and ATA adaptors FIFO, Flow Control, VLAN Tagging, Priority HP Auto MDI/MDI-X 10/100 T/TX PHY 2 10/100 MAC 2 Queue Management DMA Channel Embedded Processor Interface Non-PCI CPU Bus Interface Unit Buffer Management Frame Buffers 8/16/32 Bit Generic Host Interface MIB Counters Control Registers EEPROM Interface EEPROM I/F P1 LED[3:0] P2 LED[3:0] LED Drivers Note: For an MII/RMII, I2C or SPI interface, use the KS8883ML. LinkMD is a trademark of Micrel, Inc. Micrel Semiconductor TEL: 1.408.944.0800 FAX: 1.408.474.1000 HTTP:// www.micrel.com