USB2240 SMSC Corporation, USB2240 Datasheet - Page 14

• Manufacturer Part Number: USB2240
• Description: Ultra Fast USB 2.0 Multi-Format Flash Media Controller
• Manufacturer: SMSC Corporation

Revision 2.6 (05-08-08)
xD Write
Enable
xD Busy or
Data Ready
xD Card
Detection GPIO
xD Chip Enable
MS System
Data In/Out
MS Bus State
MS System
CLK
NAME
MS_BS
MS_SCLK
Table 5.1 USB2240/USB2241 36-Pin QFN Pin Descriptions (continued)
MS_D[7:0]
(xD_nCD)
SYMBOL
xD_nWE
xD_nB/R
xD_nCE
GPIO14
9
30
36-PIN
QFN
12
17
19
15
23
20
10
11
8
7
4
5
MEMORY STICK INTERFACE
O12
O12
DATASHEET
BUFFER
I/O12PD
O12PU
O12PU
TYPE
I/O12
IPU
14
This pin is an active low write strobe signal for xD
device.
When using the internal FET, this pin has an internal
weak pull-up resistor that is tied to the output of the
internal Power FET, and is controlled by the SM_PU
bit of the SM_CTL register.
If an external FET is used (Internal FET is disabled),
then the internal pull-up is not available (external
pull-ups must be used).
This pin is connected to the BSY/RDY pin of the xD
device.
When using the internal FET, this pin has an internal
weak pull-up resistor that is tied to the output of the
internal Power FET, and is controlled by the SM_PU
bit of the SM_CTL register.
If an external FET is used (Internal FET is disabled),
then the internal pull-up is not available (external
pull-ups must be used).
This is a GPIO designated as the xD card detection
pin.
This pin is the active low chip enable signal to the
xD device.
When using the internal FET, this pin has an internal
weak pull-up resistor that is tied to the output of the
internal Power FET, and is controlled by the SM_PU
bit of the SMC_CTL register.
If an external FET is used (Internal FET is disabled),
then the internal pull-up is not available (external
pull-ups must be used).
These pins are the bi-directional data signals for the
MS device. In serial mode, the most significant bit
(MSB) of each byte is transmitted first by either
MSC or MS device on MS_D0. MS_D0, MS_D2,
and MS_D3 have weak pull-down resistors. MS_D1
has a pull down resistor if in parallel mode,
otherwise it is disabled. In 4 or 8 bit parallel mode,
there is a weak pull-down resistor on all MS_D7 - 0
signals. The resistors are controlled by
MSC_SYSTEM_0, MSC_MODE_CTL and
MSC_PRO_HG registers.
This pin is connected to the BS pin of the MS
device.
It is used to control the Bus States 0, 1, 2 and 3
(BS0, BS1, BS2 and BS3) of the MS device.
This pin is an output clock signal to the MS device.
The clock frequency is software configurable.
Ultra Fast USB 2.0 Multi-Format Flash Media Controller
DESCRIPTION
SMSC USB2240/USB2241
Datasheet