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Vitesse Semiconductor
Vitesse Semiconductor

VSC835 Datasheet Preview

VSC835 Datasheet

34x34 Crosspoint Switch

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VSC835 pdf
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VITESSE
SEMICONDUCTOR CORPORATION
Datasheet
VSC835
2.5 Gbits/sec
34x34 Crosspoint Switch with Signal Detection
Features
• 34 Input by 34 Output Crosspoint Switch
• 2.5 Gbits/sec. NRZ Data Bandwidth
• TTL Compatible µP Interface
• Differential PECL Data Inputs
• On-chip 50Input Terminations
• 50Source Terminated PECL Output Drivers
• Single 3.3V Supply
• 14W Maximum Power Dissipation
• High Performance 256 BGA Package
General Description
The VSC835 is a monolithic 34x34 asynchronous crosspoint switch, designed to carry broadband data
streams at up to 2.5 Gbit/s. The non-blocking switch core is programmed through a parallel port interface that
allows random access programming of each output port. A high degree of signal integrity is maintained 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 34:1
multiplexer tree that can be programmed to one and only one of its 34 inputs, and each data input can be routed
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 and each output channel has an signal monitor function that can be used to identify loss of activity
(LOA). An interrupt pin is provided to signal LOA, after which an external controller can query the chip to
determine the channel(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 50 ohm resistors terminated 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.
VSC835 Block Diagram
A0 Y0
G52270-0, Rev. 4.1
7/24/00
A33
Control Logic
µP interface
Y33
© VITESSE SEMICONDUCTOR CORPORATION
741 Calle Plano, Camarillo, CA 93012 • 805/388-3700 • FAX: 805/987-5896
Page 1



Vitesse Semiconductor
Vitesse Semiconductor

VSC835 Datasheet Preview

VSC835 Datasheet

34x34 Crosspoint Switch

No Preview Available !

VSC835 pdf
VITESSE
SEMICONDUCTOR CORPORATION
2.5 Gbits/sec
34x34 Crosspoint Switch with Signal Detection
Figure 1: Detailed Block Diagram
Datasheet
VSC835
A,AN[33:0]
34 x 34
switch core
34
Y,YN[33:0]
Program memory
Control interface
DATA[5:0], ADDR[5:0]
ALE, CSB, WRB, RDB
INTB, MONCLK, CONFIG
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 ohms. 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 50 ohms to 2.0 volts. Other termination voltages are possible, such as to VCC or 1.3 volts,
but the voltage level of the output will be shifted from its nominal value. The common-mode voltage of the out-
put swing can be adjusted using the VCOM pins. The adjustment range is not calibrated, but typically allows for
+/- 200mV of adjustment in common-mode voltage. The VCOM pin self-biases to a nominal value when left
unconnected.
Output channels can be powered off in pairs if fewer than 34 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 approximately 300mW per pair.
Page 2
© VITESSE SEMICONDUCTOR CORPORATION
741 Calle Plano, Camarillo, CA 93012 • 805/388-3700 • FAX: 805/987-5896
G52270-0, Rev. 4.1
7/24/00


Part Number VSC835
Description 34x34 Crosspoint Switch
Maker Vitesse Semiconductor
Total Page 18 Pages
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