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

 

 

 

 

 

Datasheet

 

 

Table 6.1 USB4640/USB4640i Pin Descriptions (continued)

 

 

 

 

 

 

 

 

 

48-PIN

BUFFER

 

 

 

 

QFN

TYPE

 

 

SYMBOL

 

 

(Table 6.2)

DESCRIPTION

 

 

 

 

 

 

 

xD_nB/R

 

28

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

 

26

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

 

24

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 /

 

29

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.

 

 

 

 

 

 

 

xD_nCD

 

 

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

 

27

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

 

22

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).

 

 

 

 

 

 

Revision 1.0 (06-01-09)

 

 

18

SMSC USB4640/USB4640i

DATASHEET