VITESSE VSC7147 Datasheet
Hex PBC with Dual Repeater/Retimer
Storage
Communication
Products
Features and Benefits
• Industry’s first IC with six Port
Bypass Circuits (PBC) supporting both 1.0625Gb/s and
2.125Gb/s Fibre Channel data
rates – Dual mode provides
flexibility by having one device
for new and legacy designs
• Two FibreTimer
urable as:
- Repeaters for low latency
- Retimers for true Fibre
Channel Compliance
- Reduces external retimer
components, provides design
flexibility by allowing mixing
and matching of the functions
for design optimization
• Digital design of the FibreTimers
produce a device that is well
controlled over voltage, process
and temperature variations –
Provides a more robust and
reliable design
• User-selectable, on-chip receive
and transmit termination at
either 100Ω or 150Ω - Reduces
external parts and provides
greater signal control
• Speed independent TX and RX
paths aid in Fibre Channel AutoSpeed Negotiation – Allows the
device to migrate as the
specification evolves
TM
Cells config-
VSC7147
General Description
The VSC7147 expands Vitesse
Semiconductor’s wide offering of Fibre
Channel products with an IC for the
growing 2.125Gb/s Fibre Channel
storage market. The device features
six Port Bypass Circuits (PBC) that
support both 1.0625Gb/s and
2.125Gb/s Fibre Channel data rates.
The VSC7147 enables Fibre Channel
Disk Arrays, JBODs (Just a Bunch of
Disks) and storage subsystem
equipment designers to integrate more
ports and disk drives and maintain
consistently high signal quality using
fewer components.
In addition to the PBCs that steer serial
Fibre Channel signals to disk drives
and bypass faulty ports, the VSC7147
Product Brief
features dual FibreTimer Repeater/
Retimer cells. Each FibreTimer cell
contains an all-digital clock recovery
unit (CRU) that can be configured as
either a Repeater or a Retimer. In the
repeater mode, recovered data is
retransmitted to a recovered clock,
allowing for improved jitter attenuation
and low latency . In the retimer mode,
recovered data is re-transmitted
synchronously to a local reference
clock with no jitter transfer ensuring
compliance to Fibre Channel signal
quality specifications.
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Datacom Division
Hex PBC with Dual Repeater/Retimer
Repeater
Repeater
Two
FibreTimer
TM
Functions
Drive 1
Drive 2
Drive 3
PBC 0 PBC 1 PBC 2 PBC 3 PBC 4 PBC 5
Drive 4
Drive 5
Drive 6
Retimer
Drive 12
Drive 11
Drive 10
PBC 5 PBC 4 PBC 3 PBC 2 PBC 1 PBC 0
Drive 9
Drive 8
Drive 7
Connector
1.0625 or
2.125 Gb/s
FC-AL Port
VSC7147 Hex Port Bypass Circuit
VSC7147
Product Brief
Features & Benefits continued
• Device can be strapped for 1
or 2Gb/s operation – Supports
dual speed storage applications
• World-class signal integrity for
jitter compliance – Reduces
debug and redesign efforts
• Two digital Signal Detect Units
to detect the presence of valid
Fibre Channel encoded serial
data - Improves signal detect
reliability
VSC7147
Storage
Communication
Products
VSC7147 Applications
Several VSC7147’s can be cascaded together to create a JBOD. The flexibility
of the FibreTimers allow repeater and retimer functions to reside where they
make the most sense for the backplane board design.
• No external resistors on high-
speed I/O - Reduces external
parts and provides greater
signal control
• 53.125MHz or 106.25MHz
reference clock – For design
flexibility
• 5V-tolerant LVTTL inputs –
Provides design flexibility and
backward compatibility
• Cable equalization on all high-
speed inputs – Manages and
corrects signal latency and
distortion
• Single 2.5V supply - Reduces
wiring complexity
• 100-pin, 14mm exposed pad
TQFP package - Ideal for
compact JBOD designs
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For more information on Vitesse Products visit the Vitesse web site
at www.vitesse.com or contact Vitesse Sales at (800) VITESSE or
sales@vitesse.com
© Copyright 2000 Vitesse Semiconductor Corporation
and the Vitesse logo
of Vitesse Semiconductor Corp;oration
are all registered trademarks
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