USB97C201 datasheet(12/59 Pages) SMSC

12 / 59 page

SMSC DS – USB97C201

Page 12

Rev. 03/25/2002

PRELIMINARY

MISC

Crystal

Input/External

Clock Input

XTAL1/

CLKIN

ICLKx

12Mhz Crystal or external clock input.

This pin can be connected to one terminal of

the crystal or can be connected to an external

12Mhz clock when a crystal is not used.

Crystal

Output

XTAL2

OCLKx

12Mhz Crystal

This is the other terminal of the crystal, or left

open when an external clock source is used to

drive XTAL1/CLKIN.

It may not be used to

drive any external circuitry other than the

crystal circuit.

Clock Output

CLKOUT

This pin produces a 30Mhz clock signal

independent of the processor clock divider. It

is held inactive and low whenever the internal

processor

clock

stopped

being

obtained from the ring oscillator.

General

Purpose I/O

GPIO[0:7]

IO20

These general purpose pins may be used

either as inputs, edge sensitive interrupt

inputs, or outputs. In addition, GPIO0 has the

capability of auto-toggling at a 1Hz rate when

used as an output.

RESET input

nRESET

This active low signal is used by the system to

reset the chip. The active low pulse should be

at least 100ns wide.

Test input

nTest[0:2}

These signals are used for testing the chip.

User

should

normally

leave

them

unconnected. For board testing, all pads

except these test inputs are included in an

XNOR chain, such that by tying nTEST2 low,

nIOR will reflect the toggling of a signal on

each pin. Circuit board continuity of the pin

solder connections after assembly can be

checked in this manner

POWER, GROUNDS, and NO CONNECTS

VDD

+2.5V Core power

VDDIO

+3.3V I/O power

VDDP

+2.5 Analog power

VSSP

Analog Ground Reference

VDDA

+3.3V Analog power

VSSA

Analog Ground Reference

GND

Ground Reference

No Connect. These pins should not be

connected externally.

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