USB2229 datasheet(12/28 Pages) MICROCHIP

12 / 28 page

USB2229/USB2230

DS00002252A-page 12

 2005-2016 Microchip Technology Inc.

IO Write Strobe

CF_nIOW

This pin is an active low write strobe signal for CF device.

SmartMedia INTERFACE

Write Protect

SM_nWP

O8PD

This pin is an active low write protect signal for the SM

device.

This pin has a weak pull-down resistor that is

permanently enabled

Address Strobe

SM_ALE

O8PD

This pin is an active high Address Latch Enable signal for

the SM device.

This pin has a weak pull-down resistor that is

permanently enabled

Command Strobe

SM_CLE

O8PD

This pin is an active high Command Latch Enable signal

for the SM device.

This pin has a weak pull-down resistor that is

permanently enabled

Data7-0

SM_D[7:0]

I/O8PD

These pins are the bi-directional data signal SM_D7-

SM_D0.

The bi-directional data signal has an internal weak pull-

down resistor.

Read Enable

SM_nRE

08PU

This pin is an active low read strobe signal for SM device.

When using the internal FET, this pin has an internal

weak pull-up resistor that is tied to the output of the

internal Power FET.

If an external FET is used (Internal FET is disabled), then

the internal pull-up is not available (external pull-ups must

be used, and should be connected to the applicable Card

Power Supply).

Write Enable

SM_nWE

O8PU

This pin is an active low write strobe signal for SM device.

When using the internal FET, this pin has an internal

weak pull-up resistor that is tied to the output of the

internal Power FET.

If an external FET is used (Internal FET is disabled), then

the internal pull-up is not available (external pull-ups must

be used, and should be connected to the applicable Card

Power Supply).

Write Protect Switch

SM_nWPS

IPU

A write-protect seal is detected, when this pin is low.

This pin has an internally controlled weak pull-up resistor.

Busy or Data Ready

SM_nB/R

This pin is connected to the BSY/RDY pin of the SM

device.

An external pull-up resistor is required on this signal. The

pull-up resistor must be pulled up to the same power

source that powers the SM/NAND flash device.

Chip Enable

SM_nCE

O8PU

This pin is the active low chip enable signal to the SM

device.

When using the internal FET, this pin has an internal

weak pull-up resistor that is tied to the output of the

internal Power FET.

If an external FET is used (Internal FET is disabled), then

the internal pull-up is not available (external pull-ups must

be used, and should be connected to the applicable Card

Power Supply).

TABLE 5-1:

USB2229/USB2230 PIN DESCRIPTIONS (CONTINUED)

Name

Symbol

Buffer Type

Description

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