USB97C102 datasheet(7/80 Pages) SMSC

7 / 80 page

SMSC DS – USB97C102

Page 7

Rev. 03/23/2000

QFP PIN

NUMBER

SYMBOL

PIN DESCRIPTION

BUFFER

TYPE

RESET_IN

Power on reset; active high

This signal is used by the system to reset the chip. It also generates an

internal POR.

TST_OUT

XNOR Chain output

This signal is used for testing the chip via an internal XNOR Chain.

nTEST

Test input

This signal is a manufacturing test pin. User can pull it high or leave it

unconnected.

BUFFER TYPE DESCRIPTIONS

Table 2 - USB97C102 Buffer Type Description

BUFFER

DESCRIPTION

Input (no pull-up)

Input 90µA with internal pull-up

Output with 8mA drive

I/O8

Input/output with 8mA drive

I/O16

Input/output with 16mA drive

O24

Output, 24mA sink, 12mA source.

I/ODP24

Input/Output drain , 24mA sink, 12mA source with 90µA pull-up

ICLKx

XTAL clock input

OCLKx

XTAL clock output

ICLK

Clock input (TTL levels)

IOUSB

Defined in USB specification V1.1

CODE DEBUGGER INTERFACE

This interface is made available by driving NTEST=0 and TSTOUT=0 (In this mode, TSTOUT is an input of the chip).

In this mode, the pin functions are defined as follows:

QFP PIN

NUMBER

SYMBOL

PIN DESCRIPTION

BUFFER

TYPE

64, 69, 70,

63, 73, 43,

72, 71, 62-

58,

56-54

FA[15:0]

8051 Address Bus

NFRD

Data Read Strobe; active low

NFWR

Data Write; active low

112-115,

117-120

FD[7:0]

Data Bus

I/O8

nFCE

8051 T1IN timer signal

FA19

8051 T0IN timer signal

FA18

8051 WAKE interrupt signal

FA17

8051 INT1 interrupt signal

FA16

8051 INT0 interrupt signal

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