PPC34C60 datasheet(10/58 Pages) SMSC

10 / 58 page

SMSC DS – PPC34C60

Page 10

Rev. 06/01/2001

ADVANCED INFORMATION

DESCRIPTION OF PIN FUNCTIONS

PIN NO.

NAME

SYMBOL

BUFFER

TYPE

DESCRIPTION

Selected Device

SLCTD

This signal is an active high output that

indicates that the device is the active

device on the daisy chain. This may be

used for debug purposes, to enable

drivers, or to qualify signals.

nProduct ID

PID

This signal is an active low output

asserted when the host performs a

request for the peripheral's Product ID.

This function is used by the daisy chain

and multiplexor protocols.

Sense VCC

SENSE

I, PD

When pulled high, this input will enable all

output drivers of the PPC34C60. When

low, all outputs are tri-stated.

This

resolves

the

back-power

problem

inherent in parallel port peripherals.

Isolate the chip's VCC from the rest of

the peripheral's VCC using a schottky

diode. The SENSE input should be tied

to the peripheral's VCC and the anode of

the diode.

In this manner, when the

peripheral's power is off, the sense input

will shut down all outputs, preventing the

chip from driving into a low impedance

load and consequently damaging the

chip's input protection diodes.

100

Test Counters

TEST

I, PD

This is an active high signal that allows

access to some large counter chains that

are normally buried within the chip. For

normal operation this input should be left

unconnected, or tied to ground. For more

information on the test mode contact the

factory.

BUSCLK

BCLK

BUSCLK is the SCLK divided by the

value programmed in the Configuration

Reserved

RESERVED

Leave floating, no connection

9,21,

41,60,

72,90

Power

VCC

+5 Volt supply pins.

10,22,

40,59,

71,91

Ground

GND

Ground pins

Note 1: By pulling both these lines low (illegal state), the PPC34C60's output ports can be disabled.

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