SMSC USB2250 User Manual

Ultra Fast USB 2.0 Multi-Slot Flash Media Controller

Revision 1.1 (05-29-08)

18

SMSC USB2250/50i/51/51i

General Purpose 
I/O

GPIO4

(SCL/xD_ID)

118

I/O12

GPIO: This pin may be used either as input, 
edge sensitive interrupt input, or output.

O12

SCL: This is the clock output when used with 
an external EEPROM.

I/O12

xD_ID: This is the xD card detection pin only 
applicable to the USB2250/USB2250i.

General Purpose 
I/O

GPIO5 

(SDA)

5

I/O12

This pin may be used either as input, edge 
sensitive interrupt input, or output.

SDA: This is the data pin when used with an 
external serial EEPROM.

General Purpose 
I/O

GPIO8 / 

CRD_PWR0

14

I/O12

GPIO: This pin may be used either as input, 
edge sensitive interrupt input, or output.

I/O200

CRD_PWR: Card Power drive of 3.3V @ 
either 100mA or 200mA.

General Purpose 
I/O

GPIO9 / 

CRD_PWR1

78

I/O12

GPIO: This pin may be used either as input, 
edge sensitive interrupt input, or output.

I/O200

CRD_PWR: Card Power drive of 3.3V @ 
either 100mA or 200mA.

General Purpose 
I/O

GPIO10 / 

CRD_PWR2

76

I/O12

GPIO: These pins may be used either as 
input, edge sensitive interrupt input, or 
output.  It is a requirement that this is the 
only FET used to power SM devices.  Failure 
to do this will violate SM voltage specification 
on SM device pins.

I/O200

CRD_PWR: Card Power drive of 3.3V @ 
either 100mA or 200mA.

General Purpose 
I/O

GPIO11 / 

CRD_PWR3

16

I/O12

GPIO: These pins may be used either as 
input, edge sensitive interrupt input, or 
output.

I/O200

CRD_PWR: Card Power drive of 3.3V @ 
either 100mA or 200mA.

RESET Input

nRESET

64

IS

This active low signal is used by the system 
to reset the chip. The active low pulse should 
be at least 1

μs wide.

TEST Input

TEST

103

I

This signal is used for testing the chip. User 
should normally tie this pin low externally, if 
the test function is not used.

Regulator 
Enable

REG_EN

6

IPU

This signal is used to enable the internal 
1.8V regulator.