USB2640 datasheet(13/60 Pages) MICROCHIP

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DS00001947C-page 13

USB2640/USB2641

6.0

PIN DESCRIPTIONS

This section provides a detailed description of each signal. The signals are arranged in functional groups according to

their associated interface. The pin descriptions below are applied when using the internal default firmware and can be

referenced in Section 7.0, "Configuration Options," on page 23. Please reference Section 2.0, "Acronyms" for a list of

the acronyms used.

The “n” symbol in the signal name indicates that the active, or asserted, state occurs when the signal is at a low voltage

level. When “n” is not present in the signal name, the signal is asserted at a high voltage level.

The terms assertion and negation are used exclusively. This is done to avoid confusion when working with a mixture of

“active low” and “active high” signals. The term assert, or assertion, indicates that a signal is active, independent of

whether that level is represented by a high or low voltage. The term negate, or negation, indicates that a signal is inac-

tive.

6.1

USB2640/USB2641 Pin Descriptions

TABLE 6-1:

USB2640/USB2641 PIN DESCRIPTIONS

Symbol

48-Pin

QFN

Buffer Type

(Table 6-2)

Description

xD-PICTURE CARD INTERFACE (APPLIES ONLY TO USB2640)

xD_D[7:0]

I/O12PU

xD-Picture Card Data 7-0

These pins are the bi-directional data signal xD_D7 - xD_D0 and have

weak internal pull-up resistors.

xD_ALE

O12PD

xD-Picture Card Address Strobe

This pin is an active high Address Latch Enable signal for the xD-

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

permanently enabled.

xD_nB/R

IPU

xD Busy or Data Ready

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

O12PU

xD Chip Enable

This pin is an active low chip enable 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_CLE

O12PD

xD-Picture Card Command Strobe

This pin is an active high Command Latch Enable signal for the xD-

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

permanently enabled.

xD_nCD

I/O12

xD Card Detection

Designates as the xD-Picture Card detection pin.

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