VSC3138
Datasheet
4.25 Gbps 40 x 40 Asynchronous Crosspoint Switch
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F
EATURES
• 40 input by 40 output crosspoint switch
• 4.25 Gbps non-return to zero (NRZ) data bandwidth
• Input signal equalization (ISE) and output drive levels
globally programmable, or on a per channel basis.
• On-board pseudorandom bit sequence (PRBS)
generator and detector
• 2.5 V and 3.3 V complementary metal oxide
semiconductor and TT L CMOS I/O
• Parallel and serial programming modes
• Differential current mode logic (CML)
data output driver
• Software power-down for unused channels
• Secondary access port (SAP) for configuration and
monitoring
• Boundary scan support for data I/O
• 125 MHz multi-mode program port
• Multicast and striping programming modes
• On-chip input and output terminations
• Single 2.5 V supply; 3.3 V option for control port
• 4.4 W typical power in nominal drive mode
• Integrated temperature sensor and alarm
• Ball grid array (BGA) packaging
A
PPLICATIONS
• Dense wavelength, division multiplexing
(DWDM) switches
• Wavelength routers
• Storage area network (SAN) switch fabrics
• Packet-switching fabrics
G
ENERAL
D
ESCRIPTION
The VSC3138 is a 40 × 40, asynchronous, crosspoint switch designed to carry broadband data streams in a variety of
applications. Its fully non-blocking switch core is programmed using a multi-mode port interface that allows random
access programming of each I/O port; each VSC3138 data output can be programmed to connect to any of its inputs. The
signal path through the device is unregistered and fully asynchronous. This means that there are no restrictions on the
phase, frequency, or signal pattern of any input.
A high degree of signal integrity is maintained throughout the device because each high-speed output is a fully
differential, switched current driver with on-die terminations. Data inputs are terminated on-die using 100
Ω
resistors
between true and complement inputs with a common connection to an internal bias source that facilitates AC coupling to
the switch inputs.
The VSC3138 provides a multi-mode programming interface that allows commands to be implemented as either serial
data or multiplexed parallel data. Unused channels can be powered down to allow efficient use of the switch in
applications that require only a subset of the available I/O channels. A Secondary Access Port (SAP) provides for
asynchronous readback and configuration control even while the primary programming port is in use.
G52414 Revision 4.2
March 8, 2006
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