USB97C202 datasheet(10/19 Pages) SMSC

10 / 19 page

USB 2.0 ATA/ATAPI Controller

Datasheet

SMSC USB97C202

Page 10

Revision 1.6 (01-09-07)

DATASHEET

DISK DRIVE INTERFACE

IDE Chip

Select 0

IDE_nCS0

O20

This pin is the active low chip select 0 signal for

the ATA/ATAPI interface.

In part number USB97C202-MN-03 or later ROM

codes, this pin is high impedance when VBUS is

removed.

IDE Chip

Select 1 0

IDE_nCS1

O20

This pin is the active low select 1 signal for the

ATA/ATAPI interface.

In part number USB97C202-MN-03 or later ROM

codes, this pin is high impedance when VBUS is

removed.

IDE Data

IDE_D[0:12]

IO20

These pins are bits 0-12 of the ATA/ATAPI bi-

directional data bus.

In part number USB97C202-MN-03 or later ROM

codes, this pin is high impedance when VBUS is

removed.

IO Ready

IORDY

This pin is the active high IORDY signal from

the IDE drive.

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]

IO12PU

When ROMEN=0, these signals are used to

transfer data between the internal CPU and the

external program memory. When ROMEN=1, a

weak internal pull up is activated to prevent

these pins from floating.

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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