5th Generation Hi-Speed USB Flash Media and CIR Controller with Integrated Card Power FETs

Datasheet

Revision 1.3 (07-12-05)

26

SMSC USB2231/USB2232

DATASHEET

Chapter 9 GPIO Usage

Note 9.1

Function assignment may change with ROM code revision or external firmware use. ROM

Code -00 cannot be used, external firmware must be used to obtain proper functionality.

Subsequent ROM codes will contain proper functionality.Consult firmware release notes for

exact functionality for that release.

Table 9.1 GPIO Usage

NAME

ACTIVE

LEVEL

SYMBOL

DESCRIPTION AND NOTE

GPIO1

H

Flash Media Activity LED

Indicates media activity. Media or USB

cable must not be removed with LED lit.

GPIO2

H

EE_CS

Serial EE PROM chip select

GPIO3

H

V_BUS

USB V bus detect

GPIO4

H

EE_DIN/

EE_DOUT/

xDID

Serial EE PROM input/output and xD

Identify

GPIO5

H

HS_IND/

SD_CD

HS Indicator LED or SD Card Detect

Switch input

GPIO6

H

A16/ROMEN

A16 address line connect for DFU or

debug LED indicator optional.

GPIO7

H

EE_CLK/

UNCONF_LED

Serial EE PROM clock output or

Unconfigured LED.

GPIO8

L

MS_PWR_CTRL/

CRD_PWR0

Memory Stick Card Power Control, or

Internal Power FET0.

GPIO9

L

CF_PWR_CTRL

CompactFlash Card Power Control

GPIO10

L

SM_PWR_CTRL/

CRD_PWR1

SmartMedia Card Power Control, or

Internal Power FET1.

GPIO11

L

SD/MMC_PWR_CTRL/

CRD_PWR2

SD/MMC Card Power Control, or

Internal Power FET2.

GPIO12

H

MS_ACT_IND/

Media Activity/

CIR_SD

Memory Stick Activity Indicator, or

Media Activity LED or CIR Receiver

Shutdown.