KS8995XA データシートの表示（PDF） - Micrel

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KS8995XA

Integrated 5-Port 10/100 QoS Switch

Micrel 

KS8995XA

Micrel, Inc.

KS8995XA

Integrated 5-Port 10/100 QoS Switch

Rev. 2.3

General Description

The KS8995XA is a highly integrated Layer-2 quality of

service (QoS) switch with optimized bill of materials (BOM)

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 KS8995XA contains five 10/100 transceivers with pat-

ented mixed-signal low-power technology, five media access

control (MAC) units, a high-speed non-blocking switch fabric,

a dedicated address lookup engine, and an on-chip frame

buffer memory.

All PHY units support 10BASE-T and 100BASE-TX. In addi-

tion, two of the PHY units support 100BaseFX (Ports 4 and 5).

Features

• Integrated switch with five MACs and five Fast Ethernet

transceivers fully compliant to IEEE 802.3u standard

• Shared memory based switch fabric with fully non-

blocking configuration

• 10BASE-T, 100BASE-TX and 100BASE-FX 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

Auto

MDI/MDI-X

Auto

MDI/MDI-X

Auto

MDI/MDI-X

Auto

MDI/MDI-X

Auto

MDI/MDI-X

MII-P5

MDC, MDI/O

MII-SW or SNI

LED0[5:1]

LED1[5:1]

LED2[5:1]

10/100

T/Tx 1

10/100

T/Tx 2

10/100

T/Tx 3

10/100

T/Tx/Fx 4

10/100

T/Tx/Fx 5

LED I/F

10/100

MAC 1

10/100

MAC 2

10/100

MAC 3

10/100

MAC 4

10/100

MAC 5

SNI

Control

Registers

1K Look-Up

Engine

Queue

Mgmnt

Buffer

Mgmnt

Frame

Buffers

EEPROM

I/F

KS8995XA

Micrel, Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com

May 2005

1

M9999-051305

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