USB2227 datasheet(9/25 Pages) MICROCHIP

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 2007-2016 Microchip Technology Inc.

DS00002256A-page 9

USB2227/USB2228

SM_nWE

O8PU

SM Write Enable:

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).

SM_nWPS

IPU

SM Write Protect Switch:

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

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

SM_nB/R

SM Busy or Data Ready:

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.

SM_nCE

O8PU

SM Chip Enable:

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).

SM_nCD

IPU

SM Card Detection:

This is the card detection signal from SM device to indicate if the

device is inserted.

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

Memory Stick Interface

MS_BS

MS Bus State:

This pin is connected to the BS pin of the MS device.

It is used to control the Bus States 0, 1, 2 and 3 (BS0, BS1, BS2

and BS3) of the MS device.

MS_SDIO/MS_D

I/O8PD

MS System Data In/Out:

This pin is a bi-directional data signal for the MS device.

Most significant bit (MSB) of each byte is transmitted first by

either MSC or MS device.

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

resistor.

MS_D1

I/O8PD

MS System Data In/Out:

This pin is a bi-directional data signal for the MS device.

This pin has internally controlled weak pull-up and pull-down

resistors for various operational modes.

Symbol

128-Pin

VTQFP

Buffer Type

Description

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