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Vitesse Semiconductor
Vitesse Semiconductor

VSC834 Datasheet Preview

VSC834 Datasheet

2.5Gb/s 17 x 17 Crosspoint Switch

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VSC834 pdf
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VITESSE
SEMICONDUCTOR CORPORATION
Datasheet
VSC834
2.5Gb/s 17x17 Crosspoint Switch
with Input Signal Activity (ISA) Monitoring
Features
• 17 Input by 17 Output Crosspoint Switch
• 2.5Gb/s NRZ Data Bandwidth
• 42 Gb/s Aggregate Bandwidth
• TTL Compatible µP Interface
• Differential PECL Data Inputs
• On-chip 50Input Terminations
• 50Source Terminated PECL Output Drivers
• Single 3.3V Supply
• 9W Maximum Power Dissipation
• High Performance 256 Pin BGA Package
General Description
The VSC834 is a monolithic 17x17 asynchronous crosspoint switch designed to carry broadband data
streams at up to 2.5Gb/s. The non-blocking switch core is programmed through a parallel microprocessor inter-
face that allows random access programming of each output port. A high degree of signal integrity is main-
tained through the chip through fully differential signal paths.
The crosspoint function is based on a multiplexer tree architecture. Each data output is driven by a 17:1
multiplexer tree that can be programmed to one and only one of its 17 inputs, and each data input can be pro-
grammed to multiple outputs. 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.
Each input channel has an activity monitor function that can be used to identify loss of activity (LOA). An inter-
rupt pin is provided to signal LOA, after which an external controller can query the chip to determine the chan-
nel(s) on which the fault occurred.
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 50resistors connected to VTERM.
The parallel interface uses TTL levels, and provides address, data, and control pins that are compatible with
a microprocessor-style interface. The control port provides access to all chip functions, including LOA, and
programming. Program buffering is provided to allow multiple program assignments to be queued and issued
simultaneously via a single configure command.
VSC834 Block Diagram
A0 Y0
A16
Control Logic
µP Interface
Y16
G52247-0, Rev 4.2
02/09/01
© VITESSE SEMICONDUCTOR CORPORATION • 741 Calle Plano • Camarillo, CA 93012
Tel: (800) VITESSE • FAX: (805) 987-5896 • Email: prodinfo@vitesse.com
Internet: www.vitesse.com
Page 1



Vitesse Semiconductor
Vitesse Semiconductor

VSC834 Datasheet Preview

VSC834 Datasheet

2.5Gb/s 17 x 17 Crosspoint Switch

No Preview Available !

VSC834 pdf
VITESSE
SEMICONDUCTOR CORPORATION
2.5Gb/s 17x17 Crosspoint Switch
with Input Signal Activity (ISA) Monitoring
Figure 1: Detailed Block Diagram:
Datasheet
VSC834
A, AN[16:0]
17x17
Switch Core
Program Memory
17
Control Interface
DATA[4:0], ADDR[5:0]
ALE, CSB, WRB, RDB INTB,
MONCLK, CONFIG
Y, YN[16:0]
Functional Description
Data Paths
All input data must be differential and biased to PECL levels. On-chip terminations are provided, with a
nominal impedance of 50. All input termination resistors are tied to VTERM.
Data outputs are provided through differential current switches with on-chip terminations that produce a
PECL level output swing. The drive level of the output circuit is designed to produce standard PECL levels
when terminated in 50to 2.0V. Other termination voltages are possible, such as to VCC or 1.3V, but the volt-
age level of the output swing will be shifted from its nominal value. The common-mode voltage of the output
swing can be adjusted using the VCOM pin. The adjustment range is not calibrated, but typically allows for
about +200mV of adjustment in the output common-mode voltage.
Output channels can be powered off in pairs if fewer than 17 outputs are required. By connecting the VEE
pin associated with a given pair of outputs to VCC, the output pairs will pull to VCC and chip power will be
reduced by roughly 200mW.
Page 2
© VITESSE SEMICONDUCTOR CORPORATION 741 Calle Plano Camarillo, CA 93012
Tel: (800) VITESSE FAX: (805) 987-5896 Email: prodinfo@vitesse.com
Internet: www.vitesse.com
G52247-0, Rev 4.2
02/09/01


Part Number VSC834
Description 2.5Gb/s 17 x 17 Crosspoint Switch
Maker Vitesse Semiconductor
Total Page 16 Pages
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