General Description

The KSZ8895MQX/RQX/FQX/ML is a highly-integrated,

Layer 2 managed, five-port switch with numerous features

designed to reduce system cost. Intended for costsensitive 10/100Mbps five-port switch systems with low

power consumption, on-chip termination, and internal core

power controllers, it supports high-performance memory

bandwidth and shared memory-based switch fabric with

non-blocking configuration. Its extensive feature set

includes power management, programmable rate limit and

priority ratio, tag/port-based VLAN, packets filtering, fourqueue QoS prioritization, management interfaces, and MIB

counters. The KSZ8895 family provides multiple CPU data

interfaces to effectively address both current and emerging

fast Ethernet applications when Port 5 is configured to

separate MAC5 with SW5-MII/RMII and PHY5 with P5-

MII/RMII interfaces.

The KSZ8895 family offers three configurations, providing

the flexibility to meet different requirements:

• KSZ8895MQX/ML: 5 10/100Base-T/TX transceivers, 1

SW5-MII and 1 P5-MII interface

• KSZ8895RQX: 5 10/100Base-T/TX transceivers,

1 SW5-RMII and 1 P5-RMII interface

• KSZ8895FQX: 4 10/100Base-T/TX transceivers on

Ports 1, 2, 3 and 5 (port 3 can be set to the fiber

mode). 1 100Base-FX transceivers on Port 4. 1 SW5-

MII and 1 P5-MII interface

All registers of MACs and PHYs units can be managed by

the SPI or the SMI interface. MIIM registers can be

accessed through the MDC/MDIO interface. EEPROM can

set all control registers for the unmanaged mode.

KSZ8895MQX/RQX/FQX are 128-pin PQFP package.

KSZ8895ML is 128-pin LQFP package.

Datasheets and support documentation are available on

Micrel’s web site at: www.micrel.com.

Features

Advanced Switch Features

• IEEE 802.1q VLAN support for up to 128 active VLAN

groups (full-range 4096 of VLAN IDs).

• Static MAC table supports up to 32 entries.

• VLAN ID tag/untag options, per port basis

• IEEE 802.1p/q tag insertion or removal on a per port

basis based on ingress port (egress).

• Programmable rate limiting at the ingress and egress

on a per port basis.

• Jitter-free per packet based rate limiting support.

• Broadcast storm protection with percentage control

(global and per port basis).

• IEEE 802.1d rapid spanning tree protocol RSTP

support.

• Tail tag mode (1 byte added before FCS) support at

Port 5 to inform the processor which ingress port

receives the packet.

• 1.4Gbps high-performance memory bandwidth and

shared memory-based switch fabric with fully nonblocking configuration.

• Dual MII with MAC5 and PHY5 on port 5, SW5-

MII/RMII for MAC 5 and P5-MII/RMII for PHY 5.

• Enable/Disable option for huge frame size up to 2000

Bytes per frame.

• IGMP v1/v2 snooping (Ipv4) support for multicast

packet filtering.

• IPv4/IPv6 QoS support.

• Support unknown unicast/multicast address and

unknown VID packet filtering.

• Self-address filtering.

Comprehensive Configuration Register Access

• Serial management interface (MDC/MDIO) to all PHYs

registers and SMI interface (MDC/MDIO) to all

registers.

• High speed SPI (up to 25MHz) and I2

C master

Interface to all internal registers.

• I/0 pins strapping and EEPROM to program selective

registers in unmanaged switch mode.

• Control registers configurable on the fly (port-priority,

802.1p/d/q, AN and so on).

QoS/CoS Packet Prioritization Support

• Per port, 802.1p and DiffServ-based.

• 1/2/4-queue QoS prioritization selection.

• Programmable weighted fair queuing for ratio control.

• Re-mapping of 802.1p priority field per port basis.

Integrated Five-Port 10/100 Ethernet Switch

• New generation switch with five MACs and five PHYs

with fully compliant with IEEE 802.3u standard.

• PHYs designed with patented enhanced mixed-signal

technology.

• Non-blocking switch fabric assures fast packet

delivery by utilizing a 1K MAC address lookup table

and a store-and-forward architecture.

• On-chip 64Kbyte memory for frame buffering (not

shared with 1K unicast address table).

• Full duplex IEEE 802.3x flow control (PAUSE) with

force mode option.

• Half-duplex back pressure flow control.

• HP Auto MDI/MDI-X and IEEE Auto crossover

support.

• SW-MII interface supports both MAC mode and PHY

mode.

• 7-wire serial network interface (SNI) support for

legacy MAC.

• Per port LED Indicators for link, activity, and 10/100

speed.

• Register port status support for link, activity, full/half

duplex and 10/100 speed.

• Micrel LinkMD® cable diagnostic capabilities.

• On-chip terminations and internal biasing technology

for cost down and lowest power consumption.

Switch Monitoring Features

• Port mirroring/monitoring/sniffing: ingress and/or

egress traffic to any port or MII.

• MIB counters for fully compliant statistics gathering 34

MIB counters per port.

• Loop-back support for MAC, PHY and remote

diagnostic of failure.

• Interrupt for the link change on any ports.

Features (Continued)

Low Power Dissipation

• Full-chip hardware power-down.

• Full-chip software power-down and per port software

power down.

• Energy-detect mode support < 100mW full chip-power

consumption when all ports have no activity.

• Very low full chip power consumption (<0.5W) in

standalone 5-port, without extra power consumption

on transformers.

• Dynamic clock tree shutdown feature.

• Voltages: Single 3.3V supply with 3.3V VDDIO and

Internal 1.2V LDO controller enabled, or external 1.2V

LDO solution.

− Analog VDDAT 3.3V only.

− VDDIO support 3.3V, 2.5V and 1.8V.

− Low 1.2V core power .

• 0.11µm CMOS technology.

• Commercial temperature range: 0°C to +70°C.

• Industrial Temperature Range: -40°C to +85°C.

• 128-pin PQFP and 128-pin LQFP, lead-free package.

Applications

• Typical

• VOIP phone

• Set-top/game box

• Automotive

• Industrial control

• IPTV POF

• SOHO residential gateway

• Broadband gateway/firewall/VPN

• Integrated DSL/cable modem

• Wireless LAN access point + gateway

• Standalone 10/100 5-port switch