USB82640 datasheet(10/64 Pages) MICROCHIP

10 / 64 page

USB82640

DS60001312A-page 10

 2010-2015 Microchip Technology Inc.

5.0

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 Chapter 7.0, Configuration Options on page 21. The acronyms used in this chapter can be referenced in

Appendix B:, "Acronyms," on page 59.

An N at the end of a signal name indicates that the active (asserted) state occurs when the signal is at a low voltage

level. When the N is not present, the signal is asserted when it is at a high voltage level. The terms assertion and nega-

tion are used exclusively in order 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 inactive.

5.1

USB82640 Pin Description

TABLE 5-1:

USB82640 PIN DESCRIPTIONS

Symbol

48-Pin

VQFN

Buffer

Type

Description

If Pins not Used

Connection

Secure Digital Interface

SD_D[7:0]

I/O12PU

Secure Digital Data 7-0

These are the bi-directional data signals SD_D0

- SD_D7.

Note:

The pull-up resistance is a current

source that is limited to VDD.

Leave open

SD_CLK

O12

Secure Digital Clock

This is an output clock signal to SD/MMC

device.

Leave open

SD_CMD

I/O12PU

Secure Digital Command

This is a bi-directional signal that connects to

the CMD signal of the SD/MMC device.

Leave open

SD_nCD

I/O12PU

Secure Digital Card Detect

Leave open

SD_WP

Secure Digital Write Protected

Leave open

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

Memory Stick Card Insertion

MS_SCLK

O12

Memory Stick System Clock

This pin is an output clock signal to the MS

device.

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