USB4640 datasheet(19/64 Pages) SMSC

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High Speed Inter-Chip (HSIC) USB 2.0 Hub and Flash Media Controller

Datasheet

SMSC USB4640/USB4640i

Revision 1.0 (06-09-09)

DATASHEET

xD_nWP

O8PD

xD-Picture Card Write Protect

This pin is an active low write protect signal for the xD-Picture Card

device. This pin has a weak pull-down resistor that is permanently

enabled.

SPI INTERFACE

SPI_CE_n

O12

SPI Chip Enable

This is the active low chip enable output. If the SPI interface is

enabled, this pin must be driven high in power down states.

SPI_CLK /

GPIO4 /

SCL

I/O12

This is the SPI clock out to the serial ROM. See Section 6.4, "ROM

BOOT Sequence" for diagram and usage instructions. During reset,

drive this pin low.

I/O6

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

or output. Custom firmware is required to activate this function.

When configured, this is the I2C EEPROM clock pin.

SPI_DO /

GPIO5 /

SDA /

SPI_SPD_SEL

I/O12

This is the data out for the SPI port. See Section 6.4, "ROM BOOT

Sequence" for diagram and usage instructions.

I/O6

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

or output. Custom firmware is required to activate this function.

This pin is the data pin when the device is connected to the optional

I2C EEPROM.

I/O12

This pin is used to select the speed of the SPI interface. During

nRESET assertion, this pin will be tri-stated with the weak pull-down

resistor enabled. When nRESET is negated, the value on the pin will

be internally latched, and the pin will revert to SPI_DO functionality,

the internal pull-down will be disabled.

‘0’ = 30 MHz (No external resistor should be applied.)

‘1’ = 60 MHz (A 10 K external pull-up resistor must be applied.)

If the latched value is '1', then the pin is tri-stated when the chip is

in the suspend state.

If the latched value is '0', then the pin is driven low during a suspend

state.

SPI_DI

I/O12PD

This is the SPI data in to the controller from the ROM. This pin has

a weak internal pull-down applied at all times to prevent floating.

MISC

GPIO1 /

LED /

TXD

I/O6

General Purpose I/O

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

or output. Custom firmware is required to activate this function.

GPIO1 can be used as an LED output.

This signal can be configured as the TXD output of the internal

UART. Custom firmware is required to activate this function.

Table 6.1 USB4640/USB4640i Pin Descriptions (continued)

SYMBOL

48-PIN

QFN

BUFFER

TYPE

(Table 6.2)DESCRIPTION

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