BCM8320 FEATURES
BCM8320
BCM8320
FI0
FI31
BCM8332
BCM8332
BCM8332
BCM8332
BCM8332
BCM8332
BCM8332
BCM8332
S0
S3
S4
S7
CPU
CSIX
CSIX
O ptional redundancy
and speed-up
BCM8320 System Architecture
•Guaranteed Class of Service through the system –
fabric interface chip (BCM8320) schedules based on
destination, while the fabric switch chip (BCM8332)
schedules based on source. QoS can be set on a
source/destination basis with no interference from
other channels.
•Supports dual 10G interfaces in a single device.
•Excellent redundancy: all links that are used are
always active. N-1, N+1, and N¥2 redundancy modes
are all supported – no software intervention is
necessary.
•Automatic link failure detection – no software
intervention is necessary.
•Integrated SerDes provides a cost-effective and power-
conscious solution.
SUMMARY OF BENEFITS
DUAL 10G FABRIC INTERFACE
•Highly integrated, scalable switch fabric
•Single-chip bandwidth of up to 40 Gbps
•Supports two CSIX interfaces to line side
• Each CSIX supports 32, 64, or 128 bits at speeds up to
166 MHz
• HSTL Class 1 drivers
• Optional out-of-band flow control
• Four Egress Queues per CSIX interface
•96-byte or 112-byte payloads
•Flexible fabric speedup and redundancy schemes
• Additional speedup to handle Cell Size + 1 byte case
• Link failure causes graceful reduction in speed-up
•Support for 16k Multicast Groups
• Full multicast group ID carries through the fabric
•Static or dynamic configurable VOQ cell buffering
•Single level or hierarchical Weighted Round Robin
scheduling
•Proven high-speed 3.125 Gbps SerDes technology
• Built-in BERT
• SerDes runs over backplane or infiniband cables
•16-bit CPU interface @ up to 66 MHz
®
PRODUCTPRODUCT
BriefBrief
BCM8320
The BCM83XX switch fabric chipset is a highly integrated
scalable switch fabric consisting of the BCM8320 Fabric
Interface chip and the BCM8332 switch chip. The BCM83XX
switch fabric is ideal for applications such as Metro packet
aggregation, storage area networks, cellular packet infrastructure
and WAN core switching.
The BCM8320 supports up to two OC-192 CSIX ports per fabric
interface chip. Each CSIX interface allows Traffic management
devices supporting 32-bit- to 128-bit- wide interfaces to connect
to the BCM83XX switch fabric.
The BCM8320 has sixteen 3.125-Gbps SerDes links to the
BCM8332 devices. These links are 8b/10b encoded, providing a
true 2.5Gbps data link. The fabric can support up to a 4X speed-
up if all the SerDes links are used. Unlike standard crossbar
architectures, the BCM83XX switch fabric does not need
speedup to maintain line rate traffic. However, a selectable
speedup is offered to handle cell size + 1 byte traffic cases as well
as compensation for embedded system level headers.
The BCM83XX switch fabric provides exceptional fault
tolerance and redundancy including the options of N–1, N+1 and
N¥2 redundancy modes. Any link failure causes a graceful
degradation in speedup and allows continuous operation during a
failure or switch board replacement. Link failure detection is
performed in hardware and does not require software
intervention.
The BCM83XX switch fabric can support 16k multicast groups
and performs all replication in the switch fabric.
The proven 3.125-Gbps integrated SerDes provides a cost- and
power-effective solution while minimizing the number of
backplane connections to the switch fabric.
BCM8320 OVERVIEW
CSIX
CSIX
16 SerDes
3.125 Gbps
16 SeDes
3.125 Gbps
16 Bits
100 MHz
CSIX
Interface Flow
Control
Cell
Parser
Ingress
FIFOs
Egress
FIFOs
Ingress
Queue
Manager
and
Scheduler
Egress
Queue
Manager
and
Scheduler
CSIX
Interface
CPU
Interface
OOB Flow
Control
BCM8320 Block Diagram
®
Phone: 949-450-8700
FAX: 949-450-8710
Email: info@broadcom.com
Web: www.broadcom.com
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Broadcom Corporation and/or its subsidiaries in the United States and certain other countries.
All other trademarks are the property of their respective owners.
BROADCOM CORPORATION
16215 Alton Parkway, P.O. Box 57013
Irvine, California 92619-7013
© 2003 by BROADCOM CORPORATION. All rights reser ved.
8320-PB03-R-6.13.03
