USB2240 datasheet(15/28 Pages) SMSC

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Ultra Fast USB 2.0 Multi-Format Flash Media Controller

Datasheet

SMSC USB2240/USB2241

Revision 2.6 (05-08-08)

DATASHEET

MS Card

Insertion GPIO

GPIO12

(MS_INS)

IPU

This is a GPIO designated as the Memory StickTM

card detection pin.

SECURE DIGITAL INTERFACE

SD Data

SD_D[7:0]

I/O12PU

The bi-directional signals should have weak pull-up

resistors. The register can be controlled by:

SD_MMC_INTF_EN bit of SDC_MODE_CTL

SD Clock

SD_CLK

O12

This is an output clock signal to SD/MMC device.

The clock frequency is software configurable.

SD Command

SD_CMD

I/O12PU

This is a bi-directional signal that connects to the

CMD signal of SD/MMC device. The bi-directional

signal should have an internal weak pull-up resistor.

The pull-up register can be controlled by:

SD_MMC_INTF_EN bit of SDC_MODE CTL

SD Write

Protected GPIO

GPIO6

(SD_nWP)

I/O12

This is a GPIO designated as the Secure Digital

card mechanical write detect pin.

SD Card Detect

GPIO

GPIO15

(SD_nCD)

I/O12

This is a GPIO designated as the Secure Digital

card detection pin.

USB INTERFACE

USB Bus Data

USB+

USB-

I/O-U

These pins connect to the USB bus data signals.

USB

Transceiver

Bias

RBIAS

I-R

A 12.0k , 1.0% resistor is attached from VSSA to

this pin in order to set the transceiver's internal bias

currents.

24MHz Crystal

or external

clock input

XTAL1

(CLKIN)

ICLKx

This pin can be connected to one terminal of the

crystal or can be connected to an external 24 clock

when a crystal is not used.

24MHz Crystal

XTAL2

OCLKx

This is the other terminal of the crystal, or left open

when an external clock source is used to drive

XTAL1/CLKIN. It may not be used to drive any

external circuitry other than the crystal circuit.

MISC

General

Purpose I/O

GPIO1

(LED1)

I/O12

This pin may be used either as input, edge sensitive

interrupt input, or output.

In addition, as an output, the GPIO1 can be used

output controlled by the LED1_GPIO1 register.

Table 5.1 USB2240/USB2241 36-Pin QFN Pin Descriptions (continued)

NAME

SYMBOL

36-PIN

QFN

BUFFER

TYPE

DESCRIPTION

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