ETHERNET PRODUCTS
VSC7324
Barrington™ – 24x10/100/1000 Ethernet MAC with SPI-4.2 System Interface
E N A B L I N G U LT R A H I G H D E N S I T Y S W I T C H D E S I G N S :
VSC8224
VSC8224
RGMII x 24
SPI-4.2
VSC8224
VSC8224
VSC7324
Barrington
To Packet Processor
EX: NPU, ASIC, FPGA, VC Mapper, etc..
VSC8224
VSC8224
F E AT U R E S :
24 Triple Speed Ethernet Ports
Intelligent 2:1 Oversubscription
High Performance SPI-4.2 System Interface
Supports RGMII for connection to copper transceivers.
Intelligent Identification and Prioritization of Layer 2 & Layer 3 Control Traffic
Per Port Policing & Shaping
User Configurable Filtering of Unicast, Multicast & Broadcast Traffic
Supports Both Serial & Parallel CPU Access
Full RMON 1 Statistics Group and Applicable IEEE 802.3 and SNMP Statistics
BENEFITS:
Reduces the Number of Components Needed to Build High-density
Triple Speed Linecards
Eliminates Unused Bandwidth at the Client Interface
Enables Seamless Connection to a Variety of Packet Processors.
Low Pin-Count, high-Speed Interface simplifies Interconnection
of MAC & PHY
Maintains Network Stability During Peak Network Utilization
Provides user defined fairness During Periods of Oversubscription
Filters Unwanted Traffic and Minimizes Congestion During Periods
of Oversubscription
Flexible Options for Configuration, Control, & Statistical Access
Extensive Support for Performance Monitoring and Billing
A D VA N TA G E S :
Enables Increased Port Density in Chassis-based Ethernet Switching Platforms.
Increased Utilization of Shared Packet Processing Resources
Ubiquitous Industry Standard Interface
Enterprise
Access
Metro
Core
PB-VSC7324-001
VSC7324
Barrington™ – 24x10/100/1000 Ethernet MAC with SPI-4.2 System Interface
GENERAL DESCRIPTION:
The Barrington family is based on Vitesse’s third
generation MAC architecture and includes the
flagship 24-port VSC7324, the 16-port VSC7325,
and the 12-port VSC7326. Each device has
advanced traffic over-subscription mechanisms
to ensure quality of service and high bandwidth availability
during periods of peak network utilization. Combining this
capability with extensive per port buffering, high-density
platforms such as Ethernet switches and routers can aggregate
up to 24 Gigabit Ethernet ports into a single 10 Gbps packet
processor. OEMs realize a substantial cost savings by reducing
system cost per user without impacting network performance.
Barrington (VSC7324)
is an advanced 24-port Triple Speed
Ethernet MAC solution with Intelligent Over-subscription
enabling low cost, high-density, chassis-based linecards
ranging from 24 to 96 ports. Barrington, which is also available
in 12 and 16 port versions, is a versatile building block for a
range of high-density triple-speed Ethernet applications in the
Enterprise, Metro, and Core. Barrington integrates 24 triple-
speed MACs, advanced over-subscription mechanisms, an
extensive on-chip memory system, an OIF compliant SPI-4.2
interface with support for dynamic deskew, both a 16-bit
parallel and a 4-wire serial CPU interface, and dual MII
Management interfaces.
As the transition to triple-speed copper interfaces in the
Enterprise increases, the need for intelligent over-subscription
and control traffic protection functionality is critical to
efficient network operation and management. The Barrington
family includes advanced over-subscription mechanisms,
used to control the bandwidth on each Ethernet port in order to
prioritize traffic across all 24-ports. As part of the advanced over-
prioritize traffic across all 24-ports. As part of the advanced over-
subscription mechanisms, the Barrington family also prioritizes and
protects Layer 2 and Layer 3 control frames to maintain overall network
management and efficiency during periods of peak network utilization.
Interfacing to the triple-speed MAC ports is accomplished using
the reduced pin count Reduced Gigabit Media Independent
Interface (RGMII). On the system side Barrington utilizes an
industry standard SPI-4.2 system interface with 24 channels.
The internal ingress (Rx) and egress (Tx) FIFOs, which are
provisionable on a per-port basis in increments of 2 kB, are
capable of handling short-haul flow control and accommodating
bursty traffic between the Ethernet MACs and the SPI-4.2 system
interface. The FIFO structures are independently configurable for
either cut-through or store-and-forward modes.
The Barrington Family is supported in Vitesse’s MAC Application
Software (MAS) suite. The MAS is a library of generic ANSI C
functions for various Gigabit Ethernet (GbE) and Ten Gigabit
Ethernet (10GbE) Media Access Controllers in the Vitesse MAC
family. The MAC Application Software provides a common
software solution for the Vitesse MAC family beginning with
Meigs-II™ and including Meigs-IIe™ and Campbell-I™. The MAC
Application Software simplifies the use of these MAC devices by
providing a well defined, operating system and processor
independent application-programming interface (API).
The Barrington Family is supported by a comprehensive collateral
package including application notes, IBIS models, DSDL file,
reference schematics, symbols, and University of New Hampshire
(UNH) Interoperability Lab (IOL) reports for Fast Ethernet and
Gigabit Ethernet test suites.
BLOCK DIAGRAM:
S P E C I F I C AT I O N S :
1.8V Core Power Supply
2.5V & 3.3V Interface Power Supply
For more information on Vitesse Products visit the Vitesse web site
at www.vitesse.com or contact Vitesse Sales at (800) VITESSE
or sales@vitesse.com
741 Calle Plano
Camarillo, CA 93012, USA
Tel: +1 805.388.3700
Fax: +1 805.987.5896
www.vitesse.com
©2004 Vitesse Semiconductor Corporation
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