VSC852(2000) データシートの表示（PDF） - Vitesse Semiconductor
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VSC852 Datasheet PDF : 16 Pages
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VITESSE
SEMICONDUCTOR CORPORATION
Data Sheet
VSC852
1.6Gb/s 64x64
Crosspoint Switch
Features
• 64 Input by 64 Output Non-Blocking
• Full Broadcast/Multicast Capability
• 1.6Gb/s NRZ Data Bandwidth
• Designed for HDTV, GE, and FC
• TTL-Compatible Control I/O
• Fully Differential Data Path, PECL-Compatible
• On-Chip Input Terminations
• Single 3.3V Supply, 28W Maximum Dissipation
• High Performance 35mm, 440 BGA Package
General Description
The VSC852 is a monolithic 64x64 asynchronous crosspoint switch, designed to carry broadband data
streams up to 1.6Gb/s. Typical applications include Gigabit Fibre Channel/Ethernet and HDTV. The non-
blocking switch core is programmed through a serial port interface that allows random access programming of
each output port. A high degree of signal integrity is maintained throughout the chip via fully differential signal
paths.
The crosspoint function is based on a multiplexer tree architecture. Each data output is driven by a 64:1
multiplexer tree that can be programmed to one and only one of its 64 inputs. The signal path is unregistered, so
no clock is required for the data inputs. The signal path is asynchronous, so there are no restrictions on the
phase, frequency, or signal pattern at each input. (Note: the maximum frequency for any data line is 1.6Gb/s.)
Each output driver is a fully differential switched current driver with on-die back-terminations for maxi-
mum signal integrity. Data inputs are terminated on die through 50Ω resistors to an external VTT supply.
The serial port interface uses TTL levels and provides separate pins for data input and output. Core pro-
gramming can be sequential for each address or multiple program assignments can be queued and issued simul-
taneously.
VSC852 Block Diagram
G52245-0, Rev 4.1
9/26/00
© VITESSE SEMICONDUCTOR CORPORATION • 741 Calle Plano • Camarillo, CA 93012
Tel: (800)-VITESSE • FAX: (805) 987-5896 • Email: prodinfo@vitesse.com
Internet: www.vitesse.com
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