Datasheet

High-Speed Inter-Chip (HSIC) USB 2.0 Hub and Flash Media Controller
Datasheet
SMSC USB4640/USB4640i 17 Revision 1.3 (03-13-13)
DATASHEET
SPI_DO/ 10 I/O12 SPI Serial Data Out
The output for the SPI port. See Section 3.6: ROM BOOT Sequence
for diagram and usage instructions.
GPIO5/ I/O6 This pin may be used either as an input; edge sensitive interrupt
input; or output. Custom firmware is required to activate this function.
SDA/ Serial Data Line
The I
2
C EEPROM data pin when the device is connected to the
optional I
2
C EEPROM.
SPI_SPD_SEL I/O12 SPI Speed Select
Selects 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, where the
internal pull-down will be disabled.
0 : 30 MHz (no external resistor should be applied)
1 : 60 MHz (a 10 k
Ω 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 11 I/O12PD SPI Serial Data In
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/ 37 I/O6 General Purpose I/O 1
Can be used either as an input; edge sensitive interrupt input; or
output. Custom firmware is required to activate this function.
LED/ Can be used as an LED output.
TXD This signal can be configured as the TXD output of the internal
UART. Custom firmware is required to activate this function.
GPIO2/ 36 I/O6 General Purpose I/O 2
Can be used either as an input; edge sensitive interrupt input; or
output. Custom firmware is required to activate this function.
RXD This signal can be configured as input to the RXD of the internal
UART. Custom firmware is required to activate this function.
GPIO10
(CRD_PWR)
35 I/O200 Card Power Drive: 3.3 V (100 mA or 200 mA)
This must be the only FET used to power devices. Failure to do this
will violate voltage specifications on device pins. If this pin is not
being used as a card power pin, this pin may be used either as an
input; edge sensitive interrupt input; or output (GPIO).
Please see Section 4.4.2.3: A4h-A5h: Smart Media Device Power
Configuration on page 34 for more information.
Table 3.2 USB4640/USB4640i Pin Descriptions (continued)
SYMBOL
48-PIN
QFN
BUFFER
TYPE DESCRIPTION