USB2224 datasheet(15/20 Pages) SMSC

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Bus Powered USB2.0 Flash Media Controller

Datasheet

SMSC USB2224

Page 15

Revision 1.3 (09-21-04)

DATASHEET

6.2

Buffer Type Descriptions

Table 6.2 - USB2224 Buffer Type Descriptions

BUFFER

DESCRIPTION

Input

IPU

Input with controlled internal weak pull-up resistor.

IPD

Input with controlled internal weak pull-down resistor.

Input with Schmitt trigger

I/O8

Input/Output with 8mA drive

I/OD8

Input/Open drain output … 8mA sink

Output with 8mA drive

I/O8PU

Input/Output with 8mA drive controlled weak pull-up resistor

I/O8PD

Input/Output with 8mA drive controlled weak pull-down resistor

ICLKx

XTAL clock input

OCLKx

XTAL clock output

I/O-U

Analog Input/Output Defined in USB specification

O-U

Analog Output

I-U

Analog Input

OIA

Special analog Input/Output

6.3

GPIO Usage Table

Table 6.3 - GPIO Usage

NAME

ACTIVE

LEVEL

SYMBOL

DESCRIPTION AND NOTE

GPIO1

H/L

ACT/DOOR

Media Activity LED / xD Door SW

Input

GPIO2

EE_CS

Serial EE PROM chip select

GPIO3

V_BUS

USB V bus detect

GPIO4

H/L

EE_DIN/EE_DOUT/xDID

Serial EE PROM input/output and

xD ID pin input

GPIO5

SD_CD

SD Card Detect SW Input. In

production ROM versions, this pin

must always be pulled high except

to indicate SD card insertion. If no

SD interface is used, this pin must

still be pulled high for proper

operation.

GPIO6

A16 ( external ROM only )

/ROMEN

Int/Ext ROM select. External

program memory A16 address line

connect for DFU.

GPIO7

EE_CLK

Serial EE PROM clock output

GPIO8

MS Power Control

Memory Stick Card Power Control

GPIO9

CF Power Control

CompactFlash Card Power Control

GPIO10

SM Power Control

SmartMedia Card Power Control

GPIO11

SD Power Control

SD/MMC Card Power Control

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