USB97C202 datasheet(10/17 Pages) SMSC

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USB 2.0 ATA/ATAPI Controller

Datasheet

SMSC USB97C202

Page 10

Revision 1.2 (02-04-04)

DATASHEET

MISC

General

Purpose I/O

GPIO[1:7]

IO20

These general purpose pins may be used

either as inputs, edge sensitive interrupt inputs,

or outputs. When using internal ROM mode,

these pins have the following assignments:

GPIO1: USB HS Indicator; active high

GPIO2: Serial EEPROM (93LC66 type) Chip

Select

GPIO3: USB VBUS Detect Input

GPIO4: Serial EEPROM Data In/Out

GPIO5: ATA Drive Reset

GPIO6: A16 control line for external program

Flash memory when using firmware upgrade

capability (external ROM operation only)

GPIO7: Serial EEPROM Clock 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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