SSC055 查看數據表（PDF） - Vitesse Semiconductor
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SSC055 Datasheet PDF : 2 Pages
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LED Flash Rate Control
The built-in flexibility of the VSC055 allows all sixty-
four of the I/O pins to drive LEDs. Each pin is
independently programmed to flash an LED at one
of seven predefined flash rates or by firmware
definition.
VSC055 Block Diagram
Fan Speed Sensor
The VSC055 includes eight pins (P2.0 to P2.7),
which can be configured as fan speed sensors.
This feature enables the designer to provide high
value monitoring features at significantly reduced
costs. Embedded controllers may access the
VSC055 to determine the rotational speed (RPM) of
fans attached to each of the eight inputs. The
VSC055 may also be programmed to signal an
interrupt if any one of the speed sensors fall below
the designer’s predefined level.
Pulse Width Modulation Control
The VSC055 includes eight pins (P1.0 to P1.7),
which can be configured for three different pulse
rates with adjustable high/low duty cycle. This
feature enables the designer to control fan speed
via an external power MOSFET. Embedded
controllers may access the VSC055 to manage the
rotational speed (RPM) of fans attached to each of
the eight outputs.
FC-AL Port Bypass Control
Up to thirty-two of the sixty-four I/Os may be
configured to monitor and manage FC-AL port
bypass control devices. Sixteen pairs of I/Os
include special logic to monitor Enable Bypass
signals, which may be generated by FC-AL disk
drives, and control Port Bypass Control Enable
(PBC_Enx) signals on port bypass devices such as
Vitesse’s VSC7122.
The unique functionality of the VSC055 provides
the system designer with additional flexibility and
control over the port bypass function in a FC-AL
enclosure. This allows system designers to
differentiate and add value by controlling when and
how a drive is removed or inserted into a FC-AL
enclosure.
This feature may also be used for non-FC-AL
applications. It is useful wherever system
designers require flexible monitoring and control of
backplane signals.
Interrupt Support
There are up to sixty-four interrupt sources within
the VSC055. I/O pin signal transitions, fan speed
sensor threshold levels and transitions on port
bypass inputs may be configured to generate
interrupts. Advanced interrupt priority and
management logic provides the system designer
with maximum flexibility and a simple and
convenient programming method for handling
interrupts.
Related Documents
§ VSC055 Data Manual
§ SSC100/200/VSC205/210 Data Manual
§ Any SDK Specification
For More Information:
www.vitesse.com
email: prodinfo@vitesse.com
TEL: 1-800-VITESSE FAX: 805/987-5896
Vitesse Semiconductor Corporation reserves the right to make
changes in its products, specifications or other information at any
time without prior notice. Therefore the reader is cautioned to
confirm that this datasheet is current prior to placing any orders.
The company assumes no responsibility for any circuitry
described other than circuitry entirely embodied in a Vitesse
product.
(Version 1.0)
© 2000 Vitesse Semiconductor Corporation, All Rights
Reserved.
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