USB97C201 datasheet(11/59 Pages) SMSC

11 / 59 page

SMSC DS – USB97C201

Page 11

Rev. 03/25/2002

PRELIMINARY

USB INTERFACE

USB Bus

Data

USB-

USB+

IO-U

These pins connect to the USB bus data

signals.

USB

Transceiver

Filter

LOOPFLTR

This pin provides the ability to supplement the

internal filtering of the transceiver with an

external network, if required.

USB

Transceiver

Bias

RBIAS

A 9.09 Kohm precision resistor is attached

from ground to this pin to set the transceiver’s

internal bias currents.

Termination

Resistor

RTERM

A precision 1.5Kohm precision resistor is

attached to this pin from a 3.3V supply.

Full Speed

USB Data

FS-

FS+

IO-U

These pins connect to the USB- and USB+

pins through 31.6 ohm series resistors.

MEMORY/IO INTERFACE

Memory Data

Bus

MD[7:0]

IO12

These signals are used to transfer data

between the internal CPU and the external

program memory.

Memory

Address Bus

MA[15:0]

O12

These

signals

address

memory

locations

within the external memory.

Memory Write

Strobe

nMWR

O12

Program Memory Write; active low

Memory Read

Strobe

nMRD

O12

Program Memory Read; active low

IO Read

Strobe

nIOR

O12

XDATA space Read; active low

IO Write

Strobe

nIOW

O12

XDATA space Write; active low

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