USB2640I Standard Microsystems Corp., USB2640I Datasheet - Page 18

• Manufacturer Part Number: USB2640I
• Description: Industrial Temperature Usb 2.0 Flash Media Controller And Usb Hub Combo
• Manufacturer: Standard Microsystems Corp.

Revision 2.0 (10-03-08)
xD Write Enable
xD Busy or Data
xD Chip Enable
xD Card
Detection GPIO
MS Bus State
MS Card
Insertion GPIO
MS System CLK
NAME
Ready
MS_SCLK
SYMBOL
GPIO14 /
GPIO12 /
xD_nWE
xD_nB/R
xD_nCE
xD_nCD
MS_INS
MS_BS
Table 6.1 USB2640i/USB2641i Pin Descriptions (continued)
48-PIN
QFN
MEMORY STICK INTERFACE
22
28
26
29
21
31
13
Industrial Temperature USB 2.0 Flash Media Controller and USB Hub Combo
DATASHEET
BUFFER
O12PU
O12PU
TYPE
I/O12
O12
O12
IPU
IPU
18
DESCRIPTION
This pin is an active low write strobe signal for 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 xD_PU bit of the xDC_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 xD_PU bit of the xDC_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 an active low chip enable signal for 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 xD_PU bit of the xDC_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).
GPIO: This general purpose pin may be used
either as input, edge sensitive interrupt input, or
output.
xD_nCD: This is a GPIO designated as the xD-
Picture Card detection pin.
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, and BS3) of the MS device.
GPIO: This general purpose pin may be used
either as input, edge sensitive interrupt input, or
output.
MS_INS: This is a GPIO designated as the
Memory Stick card detection Pin.
This pin is an output clock signal to the MS device.
The clock frequency is software configurable.
SMSC USB2640i/USB2641i