Ultra Fast USB 2.0 Multi-Format Flash Media Controller
Datasheet
Table 5.1 USB2240/USB2241 36-Pin QFN Pin Descriptions (continued)
36-PIN
QFN
BUFFER
TYPE
NAME
MS Card
SYMBOL
DESCRIPTION
GPIO12
(MS_INS)
24
IPU
This is a GPIO designated as the Memory StickTM
card detection pin.
Insertion GPIO
SECURE DIGITAL INTERFACE
SD Data
SD_D[7:0]
7
I/O12PU
The bi-directional signals should have weak pull-up
resistors. The register can be controlled by:
SD_MMC_INTF_EN bit of SDC_MODE_CTL
8
10
20
23
25
4
5
SD Clock
SD_CLK
SD_CMD
9
O12
This is an output clock signal to SD/MMC device.
The clock frequency is software configurable.
SD Command
11
I/O12PU
This is a bi-directional signal that connects to the
CMD signal of SD/MMC device. The bi-directional
signal should have an internal weak pull-up resistor.
The pull-up register can be controlled by:
SD_MMC_INTF_EN bit of SDC_MODE CTL
SD Write
GPIO6
30
26
I/O12
I/O12
This is a GPIO designated as the Secure Digital
card mechanical write detect pin.
Protected GPIO (SD_nWP)
SD Card Detect
GPIO
GPIO15
(SD_nCD)
This is a GPIO designated as the Secure Digital
card detection pin.
USB INTERFACE
USB Bus Data
USB+
USB-
2
3
I/O-U
I-R
These pins connect to the USB bus data signals.
USB
Transceiver
Bias
RBIAS
35
33
32
A 12.0k , 1.0% resistor is attached from VSSA to
this pin in order to set the transceiver's internal bias
currents.
24MHz Crystal
or external
clock input
XTAL1
(CLKIN)
ICLKx
This pin can be connected to one terminal of the
crystal or can be connected to an external 24 clock
when a crystal is not used.
24MHz Crystal
XTAL2
OCLKx
This is the other terminal of the crystal, or left open
when an external clock source is used to drive
XTAL1/CLKIN. It may not be used to drive any
external circuitry other than the crystal circuit.
MISC
General
Purpose I/O
GPIO1
(LED1)
1
I/O12
This pin may be used either as input, edge sensitive
interrupt input, or output.
In addition, as an output, the GPIO1 can be used
output controlled by the LED1_GPIO1 register.
SMSC USB2240/USB2241
Revision 2.6 (05-08-08)
DATA1S5HEET
SMSC [ SMSC CORPORATION ]
