Ultra Fast USB 2.0 Multi-Slot Flash Media Controller

Datasheet

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

 

 

128-PIN

BUFFER

 

NAME

SYMBOL

VTQFP

TYPE

DESCRIPTION

 

 

 

 

 

MS System Data

MS_D0 /

94

I/O12PD

MS_D0: This pin is one of the bi-directional

In/Out

MS_SDIO

 

 

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

I/O12PU

These are the bi-directional data signals

 

 

11

 

SD_D0 - SD_D7.

 

 

19

 

The bi-directional signals should have weak

 

 

21

 

 

 

 

pull-up resistors. The register can be

 

 

22

 

 

 

 

controlled by the SD_MMC_INTF_EN bit of

 

 

23

 

 

 

 

SDC_MODE_CTL.

 

 

10

 

 

 

12

 

 

 

 

 

 

 

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

GPIO6

105

I/O12

This is a GPIO designated as the Secure

Protected GPIO

(SD_WP)

 

 

Digital card mechanical write detect pin.

 

 

 

 

 

SD Card Detect

GPIO15

32

I/O12

This is a GPIO designated as the Secure

GPIO

(SD_nCD)

 

 

Digital card detection pin.

 

 

 

 

 

 

 

USB INTERFACE

 

 

 

 

 

 

USB Bus Data

USB+

7

I/O-U

These pins connect to the USB bus data

 

USB-

8

 

signals.

 

 

 

 

 

USB Transceiver

RBIAS

127

I-R

A 12.0k, 1.0% resistor is attached from

Bias

 

 

 

VSSA to this pin in order to set the

 

 

 

 

transceiver's internal bias currents.

 

 

 

 

 

SMSC USB2250/50i/51/51i

15

Revision 1.1 (05-29-08)

DATASHEET