SMSC USB2242 Benutzerhandbuch

Ultra Fast USB 2.0 Memory Stick Flash Media Controller

Revision 1.0 (05-27-08)

12

SMSC USB2242/USB2242i

General Purpose 
I/O

GPIO7 / 
TXD / 
SCK /

 

MS_SKT_SEL

31

I/O12

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

O12

TXD: In addition, as an output, the GPIO7 
can be used as an output TXD of UART in 
the device, when the GPIO2/TXD bit in 
UTL_CONFIG register is set to "1"

O12

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

I

MS_SKT_SEL: On the positive edge of 
nRESET, this pin is sampled to determine 
the Memory Stick socket size. 

1 = 8 bit
0 = 4 bit

General Purpose 
I/O

GPIO10 
(CRD_PWR)

21

I/O200

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

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

General Purpose 
I/O

GPIO14

19

I/O12

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

General Purpose 
I/O

GPIO15 

26

I/O12

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

RESET Input

nRESET

18

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

28

I

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

No Connects

NC

12
15
16
17
25

No Connect. No trace or signal should be 
routed/attached to these pins.

+1.8V Core power

VDD18

13

+1.8V core power. This pin must have a 
1.0

μ

F (or greater) ±20% (ESR <0.1

Ω) 

capacitor to VSS.

3.3V Power & 
Regulator Input.

VDD33

6

14
22

3.3V Power & Regulator Input.

Ground

VSS

SLUG

Ground Reference