USB2250 datasheet(18/36 Pages) SMSC

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Ultra Fast USB 2.0 Multi-Format Flash Media Controller

Datasheet

Revision 2.6 (05-08-08)

SMSC USB2250/51/59

DATASHEET

SD / MMC INTERFACE

SD Data 7-0

SD_D[7:0]

I/O12PU

These are the bi-directional data signals

SD_D0 - SD_D7.

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_WP)

105

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

127

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.

Crystal

Input/External

Clock Input

XTAL1

(CLKIN)

124

ICLKx

24MHz Crystal or external clock input.

XTAL: This pin can be connected to one terminal

of the crystal or can be connected to an external

24/48MHz clock when a crystal is not used.

Note:

The MA[1:0] pins will be sampled while

nRESET is asserted, and the value will

be latched upon nRESET negation. This

will determine the clock source and

value.

Crystal Output

XTAL2

123

OCLKx

24MHz Crystal

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.

Table 5.1 USB2250/51/59 128-Pin VTQFP Pin Descriptions (continued)

NAME

SYMBOL

128-PIN

VTQFP

BUFFER

TYPE

DESCRIPTION

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