KS8695 Product Brief
Revision 1.07
CENTAUR Integrated Multi-Port Gateway Solutions
The KS8695 “Multi-Port Gateway-on-a-Chip”
delivers a new level of networking integration and
performance for speeding broadband gateway
development. The key components integrated in the
KS8695 include:
• Integrated layer-2 managed switch with five Fast
Ethernet transceivers and patented mixed-signal
low-power technology; five MAC units; a high-speed
non-blocking switch fabric; a dedicated address look-
up engine; an on-chip frame buffer memory and LED
controls. One port is partitioned for WAN interface
with the other 4 ports for LAN access.
• A 185-MIPS ARM 922T processor with memory
management unit (MMU) and 8kB I-cache and
8kB D-cache.
• An independent MAC unit supporting MAC or
PHY mode MII interface for networking expansion.
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On checksum errors and TCP/UDP/IP packet header
checksum generation. The protocol engine applies
to the WAN, LAN and EMAC interfaces.
• DMA engines with burst mode support; Tx and
Rx FIFOs to streamline the data transfers between
WAN and CPU, CPU and LAN, CPU and EMAC.
• Shared programmable 8/16/32-bit data bus and
22-bit address bus with up to 64MB total memory
space for SDRAM, ROM, Flash, SRAM and all
peripheral devices.
• Other peripheral support logic including GPIO,
a watchdog timer, an interrupt controller and a JTAG
debugging interface.
Complete hardware & software reference designs are
available.
The KS8695 represents a new level of total solution
optimized for broadband gateway system development
and renders speedy routing performance & connectivity
interfaces for value-added networking expansions.
Block Diagram
XceleRouter is a trademark of Micrel, Inc.
ARM is a registered trademark of ARM Limited.
Micrel Semiconductor
TEL:
1.800.401.9572
FAX:
1.408.474.0159
HTTP://
www.micrel.com
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Features
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The CENTAUR KS8695 featuring XceleRouter™
Technology, is a single-chip Multi-Port Gateway-on-a-
Chip with all the key components integrated for a high-
performance and low-cost broadband gateway
ARM922T high-performance CPU core
- 185 MIPS ARM922T core at 166MHz
- 8kB I-cache and 8kB D-cache
- Memory Management Unit (MMU) for Linux
- 32-bit ARM and 16-bit Thumb instruction sets
XceleRouter™ Technology
- TCP/UDP/IP packet header checksum generation to
offload CPU tasks
- IPv4 packet filtering on checksum errors
- Automatic error packet discard
Integrated switch engine & transceivers:
- Five 10/100 transceivers and MACs (1P for WAN
interface, 4P for LAN switching)
- 100Base-Tx, 10Base-T and 100Base-Fx modes
(Fx in the WAN port).
- On-chip SRAM as frame buffer memory
- Wire-speed switching
- VLAN ID and 802.1p tag/untag options
- Extensive MIB counter management support
- IGMP snooping for multicast packet filtering
- Port-based VLAN
- QoS/CoS packet prioritization support: per-port,
802.1p and DiffServ based
- 802.1d spanning tree protocol
- Dedicated 1K-entry look-up engine
- Automatic MDI/MDIX crossover on all ports
- Port mirroring/monitoring/sniffing
- Broadcast storm protection with % control
- Full and half-duplex flow control
Memory and external I/O interfaces
- 8/16/32-bit wide shared data path for SDRAM, ROM/
SRAM/flash & external I/O
- Total memory space up to 64MB
- Intel/AMD-type flash support
WAN/LAN/EMAC DMA Engines & FIFO
- DMA engine with burst mode support for efficient
WAN, LAN and EMAC data transfers
- FIFOs for back-to-back packet transfers
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Peripheral Support
- One MII interface (MAC or PHY mode)
- 8/16/32-bit external I/O interface supporting
PCMCIA or generic CPU/DSP host I/F
- Eight general-purpose input/output (GPIO)
- Two 32-bit timer counters (one watchdog)
- Interrupt controller
- ARM922T JTAG debug interface
Power management
- Reduced CPU and system clock speeds
System design
- 208-pin PQFP package
- Up to 166MHz CPU and 125MHz bus speed
Reference HW/SW evaluation kit
- Hardware evaluation board (passes class B EMI)
- Board support package including firmware source
codes, Linux kernel, software stacks
- Documentation for design & programming
Multi-port broadband gateway
Multi-port firewall & VPN appliances
Combo wireless and wireline gateway
Multi-port VoIP gateway
Fiber-to-the-Home managed CPE
Applications
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Micrel Semiconductor
TEL:
1.800.401.9572
FAX:
1.408.474.0159
HTTP://
www.micrel.com
Contact Micrel Semiconductor
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Micrel Semiconductor
TEL:
1.800.401.9572
FAX:
1.408.474.0159
HTTP://
www.micrel.com
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