.

LED Flash Rate Control

The built-in flexibility of the SSC050 allows all forty

of the I/O pins to drive LEDs through a pull-up

resistor. Each pin is independently programmed to

flash an LED at one of seven predefined flash rates.

Fan Speed Sensors

The SSC050 includes four pins (P2.4 to P2.7),

which may 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

SSC050 to determine the rotational speed (RPM) of

fans attached to each of the four inputs.

The

SSC050 may also be programmed to signal an

interrupt if any one of the speed sensors fall below

the designer’s predefined level.

FC-AL Port Bypass Control

Up to sixteen of the forty I/Os may be configured to

monitor and manage FC-AL port bypass control

devices. Eight 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 SSC050 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 forty interrupt sources within the

SSC050.

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

§ VSC050 Data Manual

§ SSC100/200/VSC205/210 Data Manual

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.

I/O Control

and LED

Flash

Fan Speed

Sensors

Port Bypass

Control

Interrupt

Priority and

Control

Two-Wire

Slave I/F

Power

On Reset

Clock

SSC050 Block Diagram