VSC838-01
Datasheet
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3.2 Gbps 36 × 36 Crosspoint Switch
Features
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36 inputs by 36 outputs
3.2 Gbps NRZ data bandwidth
Non-blocking architecture broadcast and multicast
capabilities
LVTTL/2.5 V CMOS control I/O (3.3 V tolerant)
Input signal activity (ISA) monitoring function
Integrated signal equalization (ISE) for
deterministic jitter reduction
66 MHz dual programming port
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Parallel and serial programming modes
Programmable on-chip I/O termination
Differential CML output drivers
Single 2.5 V supply
6 W typical, Low-Drive mode
7 W typical, High-Drive mode
37.5 mm, 480-pin TBGA package
General Description
The VSC838-01 device is a monolithic, 36 by 36, asynchronous crosspoint switch designed to carry broadband data
streams. It has an internal 37th output channel which is used in conjunction with the Input Signal Activity (ISA)
monitoring function to facilitate efficient system diagnostics. A high degree of signal integrity is maintained
throughout the chip by means of fully differential signal paths.
The device crosspoint function is based on a multiplexer array architecture. Each data output is driven by a 36:1
multiplexer that can be programmed to one, and only one of its 36 inputs. The signal path is unregistered and fully
asynchronous, so there are no restrictions on the phase, frequency, or signal pattern at each input.
Each high-speed output is a fully differential, switched current driver with switchable on-die terminations for
maximum signal integrity. Data inputs are terminated on-die using 100
Ω
impedance between true and complement
inputs. For more information, see
A dual mode programming interface is provided that allows programming commands to be sent as serial data or
parallel data. Core programming can be random for each port address, or multiple program assignments can be
queued and issued simultaneously. The programming may be initialized to a “straight-through” configuration (A0 to
Y0, A1 to Y1, etc.) using the INIT pin.
VMDS-10195 Revision 4.0
August 19, 2005
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