KS8995X Micrel KS8995X Integrated 5-Port 10/100 QoS Switch Rev. 1.13 General Description Features The KS8995X is a highly integrated Layer-2 QoS (Quality of Service) switch with optimized BOM (Bill of Materials) cost for low port count, cost-sensitive 10/100Mbps switch systems. It also provides an extensive feature set including three different QoS priority schemes, a dual MII interface for BOM cost reduction, rate limiting to offload CPU tasks, software and hardware power-down, a MDC/MDIO control interface and port mirroring/monitoring to effectively address both current and emerging Fast Ethernet applications. The KS8995X contains five 10/100 transceivers with patented mixed-signal low-power technology, five MAC (Media Access Control) units, a high-speed non-blocking switch fabric, a dedicated address lookup engine, and an on-chip frame buffer memory. All PHY units support 10BaseT and 100BaseTX. In addition, two of the PHY units support 100BaseFX (Ports 4 and 5). All support documentation can be found on Micrel’s web site at www.micrel.com. • Integrated switch with five MACs and five Fast Ethernet transceivers fully compliant to IEEE 802.3u standard • Shared memory based switch fabric with fully nonblocking configuration • 10BaseT, 100BaseTX and 100BaseFX modes (FX in Ports 4 and 5) • Dual MII configuration: MII-Switch (MAC or PHY mode MII) and MII-P5 (PHY mode MII) • VLAN ID tag/untag options, per-port basis • Enable/disable option for huge frame size up to 1916 bytes per frame • Broadcast storm protection with percent control – global and per-port basis • Optimization for fiber-to-copper media conversion • Full-chip hardware power-down support (register configuration not saved) • Per-port-based software power-save on PHY (idle link detection, register configuration preserved) • QoS/CoS packets prioritization supports: per port, 802.1p and DiffServ based Functional Diagram 10/100 T/Tx 1 10/100 MAC 1 Auto MDI/MDIX 10/100 T/Tx 2 10/100 MAC 2 Auto MDI/MDIX 10/100 T/Tx 3 10/100 MAC 3 Auto MDI/MDIX 10/100 T/Tx/Fx 4 10/100 MAC 4 Auto MDI/MDIX MII-P5 MDC, MDI/O MII-SW or SNI 10/100 T/Tx/Fx 5 10/100 MAC 5 LED0[5:1] LED1[5:1] LED2[5:1] SNI LED I/F Control Registers 1K look-up Engine FIFO, Flow Control, VLAN Tagging, Priority Auto MDI/MDIX Queue Mgmnt Buffer Mgmnt Frame Buffers EEPROM I/F Micrel, Inc. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 944-0970 • http://www.micrel.com December 2003 1 M9999-120403
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