USB2640 datasheet(14/60 Pages) MICROCHIP

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USB2640/USB2641

DS00001947C-page 14

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xD_nRE

O12PU

xD Read Enable

This pin is an active low read strobe signal for the xD-Picture Card

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 (the internal FET is disabled), then the

internal pull-up is not available (an external pull-up is required).

xD_nWE

O12PU

xD Write Enable

This pin is an active low write strobe signal for the xD-Picture Card

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 (the internal FET is disabled), then the

internal pull-up is not available (an external pull-up is required).

xD_nWP

O12PD

xD-Picture Card Write Protect

This pin is an active low write protect signal for the xD-Picture Card

device. This pin has a weak pull-down resistor that is permanently

enabled.

MEMORY STICK INTERFACE

MS_BS

O12

Memory Stick Bus State

This pin is connected to the bus state pin of the MS device. It is used

to control the Bus States 0, 1, 2, and 3 (BS0, BS1, and BS3) of the MS

device.

MS_INS

I/O12

IPU

Memory Stick Card Insertion

Designates as the Memory Stick card detection pin and has an internal

weak pull-up resistor.

MS_SCLK

O12

Memory Stick System Clock

This pin is an output clock signal to the MS device.

MS_D[7:0]

I/O12PD

Memory Stick System Data In/Out

These pins are the bi-directional data signals for the MS device. In

serial mode, the most significant bit (MSB) of each byte is transmitted

first by either MSC or MS device on MS_D0.

MS_D0, MS_D2, and MS_D3 have weak pull-down resistors. MS_D1

has a pull down resistor if in parallel mode, otherwise it is disabled. In

4- or 8-bit parallel modes, all MS_D7 - MS_D0 signals have weak pull-

down resistors.

SECURE DIGITAL / MULTIMEDIACARD INTERFACE

SD_D[7:0]

I/O12PU

Secure Digital Data 7-0

These are the bi-directional data signals SD_D0-SD_D7 and have

weak pull-up resistors.

TABLE 6-1:

USB2640/USB2641 PIN DESCRIPTIONS (CONTINUED)

Symbol

48-Pin

QFN

Buffer Type

(Table 6-2)

Description

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