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SMSC USB2250i User Manual

Page 15

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Ultra Fast USB 2.0 Multi-Slot Flash Media Controller

Datasheet

SMSC USB2250/50i/51/51i

15

Revision 1.1 (05-29-08)

DATASHEET

MS System Data
In/Out

MS_D0 /

MS_SDIO

94

I/O12PD

MS_D0: This pin is one of 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 the
MS device on MS_D0, MS_D0, MS_D2, and
MS_D3 (which have weak pull-down
resistors). MS_D1 has a pull-down resistor
if it is in parallel mode; Otherwise, it is
disabled. In 4- or 8-bit parallel mode, all
MS_D7~0 signals have a weak pull-down
resistor. The resistors are controlled by
MSC_SYSTEM_0, MSC_MODE_CTL and
MSC_PRO_HG registers.

MS_SDIO: Serial Data Bus. Responsible for
transfer direction and types of data change
depending on the Bus State.

SD / MMC INTERFACE

SD Data 7-0

SD_D[7:0]

13

11

19
21
22
23
10
12

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 the SD_MMC_INTF_EN bit of
SDC_MODE_CTL.

SD Clock

SD_CLK

18

O12

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

The clock frequency is software configurable.

SD Command

SD_CMD

20

I/O12PU

This is a bi-directional signal that connects to
the CMD signal of the 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)

32

I/O12

This is a GPIO designated as the Secure
Digital card detection pin.

USB INTERFACE

USB Bus Data

USB+

USB-

7
8

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.

Table 5.1 USB2250/50i/51/51i 128-Pin VTQFP Pin Descriptions (continued)

NAME

SYMBOL

128-PIN

VTQFP

BUFFER

TYPE

DESCRIPTION

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