Bus Powered USB2.0 Flash Media Controller

Datasheet

Revision 1.3 (06-13-06)

Page 14

SMSC USB2224

DATASHEET

NAME

SYMBOL

BUFFER

TYPE

DESCRIPTION

General

Purpose I/O

GPIO4

I/O8

This pin may be used either as input, edge sensitive

interrupt input, or output.

This pin’s function while operating from internal ROM is

shown in Table 6.3 - GPIO Usage.

General

Purpose I/O

GPIO5

I/O8

This pin may be used either as input, edge sensitive

interrupt input, or output.

This pin’s function while operating from internal ROM is

shown in Table 6.3 - GPIO Usage.

General

Purpose I/O

GPIO7

I/O8

This pin may be used either as input, edge sensitive

interrupt input, or output.

This pin’s function while operating from internal ROM is

shown in Table 6.3 - GPIO Usage.

General

Purpose I/O

GPIO[15:8]

I/O8

These pins may be used either as input, or output.

These pins’ functions while operating from internal ROM

are shown in Table 6.3 - GPIO Usage.

RESET input

nRESET

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

nTEST[0:1]

I

These signals are used for testing the chip. User should

normally tie them high externally.

DIGITAL POWER, GROUNDS, and NO CONNECTS

1.8v Digital

Core Power

VDDCORE

+1.8V Core power

All VDDCORE pins must be connected together on the

circuit board.

Pin 91 MUST have a 10uf +/- 20%, (equivalent series

resistance (ESR) <0.1ohm) bypass capacitor to VSSA,

and this capacitor should be placed as close to the pin as

possible.

3.3v Digital I/O

power

VDDIO

+3.3V I/O power

VDDCORE

reference

ground

VSSCORE

VDDCORE ground Reference

VDDIO

reference

ground

VSSIO

VDDIO ground reference

Note 1:

Hot-insertion capable card connectors are required for all of flash medias. It is required for SD connector to

have Write Protect switch. This allows the chip to detect MMC card.

Note 2:

nMCE is normally asserted except when the system is in standby mode.