USB2250 datasheet(12/43 Pages) MICROCHIP

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DS00002005A-page 12

USB2250/50i/51/51i

SM Chip Enable

SM_nCE

O12PU

This pin is the active low chip enable signal to

the SM device.

When using the internal FET, this pin has a

weak internal pull-up resistor that is tied to the

output of the internal power FET.

If an external FET is used (internal FET is

disabled), then the internal pull-up is not

available (external pull-ups must be used).

SM Card

Detection

SM_nCD

I/O12

Designates as the Smart Media card detection

pin.

MEMORY STICK (MS) INTERFACE

MS Bus State

MS_BS

O12

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, BS2 and BS3) of the MS device.

MS Card Insertion

MS_INS

IPU

Designates as the Memory Stick card detection

pin.

MS System CLK

MS_SCLK

101

O12

This pin is an output clock signal to the MS

device. The clock frequency is software

configurable.

MS System Data

In/Out

MS_D[7:1]

100

I/O12PD

MS_D[7:1]: These pins are the bi-directional

data signals for the MS device.

MS_D2 and MS_D3 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, each MS_D7:1

signal has a weak pull-down resistor.

MS System Data

In/Out

MS_D0 /

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_D2, and MS_D3

(which have weak pull-down resistors). If

MS_D1 is in parallel mode, it has a pull-down

resistor; Otherwise, it is disabled.

In 4- or 8-bit parallel mode, the MS_D0 signal

has a weak pull-down resistor.

SECURE DIGITAL (SD) / MULTIMEDIACARD (MMC) INTERFACE

SD Data 7-0

SD_D[7:0]

I/O12PU

These pins are bi-directional data signals

SD_D0 - SD_D7 and have weak pull-up

resistors.

SD Clock

SD_CLK

O12

This is an output clock signal to the SD/MMC

device.

The clock frequency is software configurable.

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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