USB4640 datasheet(18/64 Pages) SMSC

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High Speed Inter-Chip (HSIC) USB 2.0 Hub and Flash Media Controller

Datasheet

Revision 1.0 (06-09-09)

SMSC USB4640/USB4640i

DATASHEET

xD_nB/R

IPU

xD-Picture Card Busy or Data Ready

This pin is connected to the BSY/RDY pin of the xD-Picture Card

device.

When using the internal FET, this pin has an internal weak pull-up

resistor that is tied to the output of the internal power FET.

If an external FET is used (the internal FET is disabled), then the

internal pull-up is not available (an external pull-up is required).

xD_nCE

O8PU

xD-Picture Card Chip Enable

This pin is an active low chip enable signal for the xD-Picture Card

device.

When using the internal FET, this pin has an internal weak 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 (an external pull-up is required).

xD_CLE

O8PD

xD-Picture Card Command Strobe

This pin is an active high Command Latch Enable signal for the xD-

Picture Card device. This pin has a weak pull-down resistor that is

permanently enabled.

GPIO14 /

xD_nCD

I/O6

This general purpose pin may be used either as input, edge sensitive

interrupt input, or output. Custom firmware is required to activate this

function.

I/O8

xD-Picture Card Detection GPIO

This is a GPIO designated by the default firmware as the xD-Picture

Card detection pin and has an internal pull-up.

xD_nRE

O8PU

xD-Picture Card Read Enable

This pin is an active low read strobe signal for the xD-Picture Card

device.

When using the internal FET, this pin has an internal weak 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 (an external pull-up is required).

xD_nWE

O8PU

xD-Picture Card Write Enable

This pin is an active low write strobe signal for the xD-Picture Card

device.

When using the internal FET, this pin has an internal weak 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 (an external pull-up is required).

Table 6.1 USB4640/USB4640i Pin Descriptions (continued)

SYMBOL

48-PIN

QFN

BUFFER

TYPE

(Table 6.2)DESCRIPTION

USB4640 Datenblatt(PDF) 18 Page - SMSC Corporation

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