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Micrel Semiconductor TEL: 1.408.944.0800 FAX: 1.408.955.1666 HTTP:// www.micrel.com
1K look-up
Engine
Queue
Mgmnt
10/100
MAC 1
Buffer
Mgmnt
Frame
Buffers
FIFO, Flow Control, VLAN Tagging, Priority
10/100
MAC 2
10/100
MAC 3
10/100
MAC 4
10/100
MAC 5
SNI
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
EEPROM
I/F
LED I/F
Auto
MDI/MDIX
Auto
MDI/MDIX
Auto
MDI/MDIX
Auto
MDI/MDIX
Auto
MDI/MDIX
MII-SW or SNI
LED0[5:1]
LED1[5:1]
LED2[5:1]
Control
Registers
MII-P5
MDC, MDI/O
KS8995XA
KS8995XA Product Brief
Revision 2.0
Integrated 5-Port 10/100 QoS Switch
The KS8995XA is a highly integrated Layer-2 QoS
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, dual MII interface
for BOM cost reduction, programmable rate limiting to
offload CPU tasks, software & hardware power-down,
MDC/MDIO control interface and port monitoring to
effectively address both current and emerging Fast
Ethernet applications.
The KS8995XA 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 10Base-T and 100BaseTX.
In addition, two of the PHY units support 100BaseFX
(Ports 4 and 5).
Block Diagram
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
• 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
• Programmable rate limiting, ingress and egress port, rate
options for high and low priority, per port basis
• Flow control or drop packet rate limiting (ingress port)
• 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)
2Micrel Semiconductor TEL: 1.408.944.0800 FAX: 1.408.955.1666 HTTP://www.micrel.com
Applications
• Broadband gateway/firewall/VPN
• Integrated DSL or cable modem multi-port router
• Wireless LAN access point plus gateway
• Home networking expansion
• Standalone 10/100 switch
• Hotel/campus/MxU gateway
• Enterprise VoIP gateway/phone
• FTTx customer premise equipment
• Media converter
Features
• QoS/CoS packets prioritization supports: per port,
802.1p and DiffServ based
• 802.1p/q tag insertion or removal on a per port basis
(egress)
• Port-based VLAN support
• MDC and MDI/O interface support to access the MII
PHY control registers (not all control registers)
• MII local loopback support
• On-chip 64kB memory for frame buf fering (not
shared with 1K unicast address table)
• 1.4Gbps high performance memory bandwidth
• Wire-speed reception and transmission
• Integrated look-up engine with dedicated 1K unicast
MAC addresses
• Automatic address learning, address aging and address
migration
• Full duplex IEEE 802.3x and half-duplex back pressure
flow control
• Comprehensive LED support
• 7-wire SNI support for legacy MAC interface
• Automatic MDI/MDI-X crossover for plug-and-play
• Low power, 1.8V, 2.5V or 3.3V, 0.18µm CMOS
technology
• Available in 128-pin PQFP package
3
Micrel Semiconductor TEL: 1.408.944.0800 FAX: 1.408.955.1666 HTTP:// www.micrel.com
System Level Applications
Ethernet
MAC
CPU
Switch Controller
On-Chip Frame Buffers
MII-SW
10/100
PHY 5
4-port
LAN
MII-P5
1-port
WAN I/F
10/100
MAC 1
10/100
MAC 2
10/100
MAC 3
10/100
MAC 4
10/100
MAC 5
10/100
PHY 1
10/100
PHY 2
10/100
PHY 3
10/100
PHY 4
SPI/GPIO
SPI
External WAN port PHY not needed
Ethernet
MAC
Figure 1. Broadband Gateway
Ethernet
MAC
CPU
Switch Controller
On-Chip Frame Buffers
MII-SW
10/100
PHY 5
4-port
LAN
MII-P5
10/100
MAC 1
10/100
MAC 2
10/100
MAC 3
10/100
MAC 4
10/100
MAC 5
10/100
PHY 1
10/100
PHY 2
10/100
PHY 3
10/100
PHY 4
WAN PHY & AFE
(xDSL, CM...)
SPISPI/GPIO
Figure 2. Integrated Broadband Router
4Micrel Semiconductor TEL: 1.408.944.0800 FAX: 1.408.955.1666 HTTP://www.micrel.com
Stock Code M1014-120303
Switch Controller
On-Chip Frame Buffers
10/100
PHY 5
5-port
LAN
10/100
MAC 1
10/100
MAC 2
10/100
MAC 3
10/100
MAC 4
10/100
MAC 5
10/100
PHY 1
10/100
PHY 2
10/100
PHY 3
10/100
PHY 4
Figure 3. Standalone Switch
Contact Micrel Semiconductor
Location Address Telephone Fax
Corporate HQ 1849 Fortune Drive San Jose, CA 95131 USA +1 (408) 944-0800 +1-408-944-0970
Eastern USA 93 Branch Street Medford, NJ 08055 USA +1 (609) 654-0078 +1 (609) 546-0989
Central USA 722 S. Denton Tap Suite 130 Coppell, TX 75019 USA +1 (972) 393-2533 +1 (972) 393-2540
Western USA 2180 Fortune Drive San Jose, CA 95131 USA +1 (408) 944-0800 +1 (408) 914-7878
Southwest USA 7545 Irvine Center Dr. Suite 200 Irvine, CA 92618 USA +1 (949) 623-8343 +1 (949) 623-8305
China Room 712, Block B, Int’l Chamber of Commerce,
Fuhua Road 1, Futian Shenzhen, PR China 518026 +86 (755) 2693-4601
Korea 4F, KTB Building, 826-14, Yeoksam-dong, Kangnam-ku Seoul 135-080 Korea +82 (2) 3466-3000 +82 (2) 3466-2999
Taiwan 7F-6, No. 237, Sec. 2, Fu-Hsing South Road Taipei, Taiwan, R.O.C. +886 (2) 2705-4976 +886 (2) 2705-4977
Japan 1-16-15 Dogenzaka, Shibuyaku Tokyo 150-0043 Japan +81 (3) 5428-0871 +81 (3) 5428-0872
Europe 1st Floor, 3 Lockside Place, Mill Lane Newbury, Berks RG14 5QS UK +44 1635 524455 +44 1635 524466
Western Europe 10, avenue du Quebec, Villebon BP116 Courtaboeuf Cedex 91944 France +33 (0) 1 6092 4189 +33 (0) 6 0868 4489
