1
Micrel Semiconductor
TEL:
1.800.401.9572
FAX:
1.408.474.0159
HTTP://
www.micrel.com
1K look-up
Engine
Queue
Mgmnt
10/100
MAC 1
Buffer
Mgmnt
Frame
Buffers
FIFO, Flow Control, VLAN
T
agging ,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
KS8995X Product Brief
Revision 1.08
Integrated 5-Port 10/100 QoS Switch
The KS8995X 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 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 10Base-T and 100BaseTX.
In addition, two of the PHY units support 100BaseFX
(Ports 4 & 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 & 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 % controlglobal 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)
Micrel Semiconductor
TEL:
1.800.401.9572
FAX:
1.408.474.0159
HTTP://
www.micrel.com
2
Applications
Broadband gateway/firewall/VPN
Integrated DSL or cable modem multi-port router
Wireless LAN access point + 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 buffering (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, 1.8/2.5/3.3V, 0.18um CMOS technology
Available in 128-pin PQFP package
3
Micrel Semiconductor
TEL:
1.800.401.9572
FAX:
1.408.474.0159
HTTP://
www.micrel.com
System Level Applications
Ethernet
MAC
Ethernet
MAC
CPU
Switch Controller
On-Chip Frame Buf
fers
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
Figure 1. Broadband Gateway
Ethernet
MAC
CPU
Switch Controller
On-Chip Frame Buf
fers
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...)
SPI
SPI/GPIO
Figure 2. Integrated Broadband Router
Micrel Semiconductor
TEL:
1.800.401.9572
FAX:
1.408.474.0159
HTTP://
www.micrel.com
4
STOCK NO. M-1009
Switch Controller
On-Chip F
r
ame Buff
ers
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
Southeast USA
8105 Bluffridge Drive
Raleigh, NC 27615 USA
+1 (919) 870-7650
+1 (919) 870-7651
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
+1-408-944-0970
Northwest USA
401 NE Ravenna Blvd. Box 152
Seattle, WA 98115 USA
+1 (206) 526-7299
+1 (206) 526-8829
Southwest USA
7545 Irvine Center Dr. Suite 200
Irvine, CA 92618 USA
+1 (949) 623-8343
+1 (949) 623-8305
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
China
12A, XingHao City Garden
Shenzhen, P.R. China
+86 (755) 2693-4601
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
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