USB2250 datasheet(11/43 Pages) MICROCHIP

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USB2250/50i/51/51i

DS00002005A-page 11

 2009 - 2015 Microchip Technology Inc.

CF DMA request

CF_DMARQ /

RXD

117

CF_DMARQ: This pin is the DMA request from

the device to the CF controller.

RXD: The signal can be used as input to the

RXD of UART in the device. Custom firmware is

required to activate this function.

CF DMA

acknowledge

CF_DMACK

119

O12

CF_nDMACK: This pin is an active low DMA

acknowledge signal for the CF device.

SMARTMEDIA (SM) INTERFACE

SM Write Protect

SM_nWP

O12PD

This pin is an active low write protect signal for

the SM device and has a weak pull-down

resistor that is permanently enabled.

SM Address

Strobe

SM_ALE

O12PD

This pin is an active high Address Latch Enable

signal for the SM device and has a weak pull-

down resistor that is permanently enabled.

SM Command

Strobe

SM_CLE

O12PD

This pin is an active high Command Latch

Enable signal for the SM device and has a weak

pull-down resistor that is permanently enabled.

SM Data 7-0

SM_D[7:0]

I/O12PD

These pins are the bi-directional data signals

SM_D7-SM_D0 and have weak internal pull-

down resistors.

SM Read Enable

SM_nRE

O12PU

This pin is an active low read strobe signal for

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 Write Enable

SM_nWE

O12PU

This pin is an active low write strobe signal for

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 Write Protect

Switch

SM_nWPS

IPU

A write-protect seal is detected when this pin is

low. This pin has a weak internal pull-up resistor.

SM Busy or Data

Ready

SM_nB/R

IPU

This pin is connected to the BSY/RDY pin of 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).

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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