VITESSE
SEMICONDUCTOR CORPORATION
Data Sheet
VSC7140
Features
• Supports ANSI X3T11 1.0625Gb/s, FC-AL
Disk Attach for Resiliency
• Dual Digital Clock Recovery Units
• Dual Digital Signal Detect Units
• Dual Port Bypass Circuits
• 106.25 or 53.125 MHz Reference Clock
1.0625 Gb/s Fibre Channel
Dual Repeater / Hub Node
• Implements 2 Hub Nodes
• Provides Bi-directional Signal Clean-up.
• 1.2 W Typical Power Dissipation
• 3.3V Power Supply
• 52-Pin, 10mm PQFP
General Description
The VSC7140 is a dual Fibre Channel repeater which can be used in Hubs, JBODs or any Fibre Channel
Subsystem requiring clean incoming and outgoing signals at a bulkhead connector. The digital Clock Recovery
Unit (CRU) recovers incoming data from an external device, amplifies it and attenuates jitter. A digital Signal
Detect Unit (SDU) determines whether the incoming signal contains invalid Fibre Channel data. A 2:1 multi-
plexer forms a Port Bypass Circuit (PBC) to route either recovered incoming data or SI to SO.
Fibre Channel subsystems requiring signal cleanup at the bulkhead would connect RX1 to the incoming
signal and SO1 to the internal subsystem’s input. RX2 would connect to the output of the subsystem and SO2
would connect to the bulkhead.
For Hub applications, SI would connect to the previous Hub Node and output data to the external device on
TX. Incoming data from the external device on RX is recovered and cleaned up and passed to the next Hub
node on SO. If the external device is not functional, SI is passed to SO.
VSC7140 Block Diagram
FAIL1-
SEL1
SDU1
RX1+
RX1-
SI1+
SI1-
ERRSEL
SO2+
SO2-
1
0
TX2+
TX2-
REFSEL
REFCLK
(106/53 MHz)
CRU1
1
PBC1
SO1+
SO1-
TX1+
TX1-
0
CRU2
PBC2
SDU2
1
0
RX2+
RX2-
PBC3
SI2+
SI2-
CMU
SEL2
FAIL2-
HUB
G52180-0, Rev 4.0
10/23/00
©
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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