5th Generation Hi-Speed USB Flash Media and CIR Controller with Integrated Card Power FETs
Datasheet
Table 6.1 USB2231/USB2232 Pin Descriptions
BUFFER
NAME
SYMBOL
TYPE
DESCRIPTION
SM
SM_nWE
O8PU
This pin is an active low write strobe signal for SM
device.
Write Enable
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.
08
IPU
I
If an external FET is used (Internal FET is disabled),
then the internal pull-up is not available (external pull-
ups must be used, and should be connected to the
applicable Card Power Supply).
SM
SM_nWPS
SM_nB/R
A write-protect seal is detected, when this pin is low.
Write Protect Switch
This pin has an internally controlled weak pull-up
resistor.
SM
This pin is connected to the BSY/RDY pin of the SM
device.
Busy or Data Ready
An external pull-up resistor is required on this signal.
The pull-up resistor must be pulled up to the same
power source that powers the SM/NAND flash device.
SM
SM_nCE
O8PU
This pin is the active low chip enable signal to the SM
device.
Chip Enable
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.
08
If an external FET is used (Internal FET is disabled),
then the internal pull-up is not available (external pull-
ups must be used, and should be connected to the
applicable Card Power Supply).
SM
SM_nCD
MS_BS
IPU
This is the card detection signal from SM device to
indicate if the device is inserted.
Card Detection
This pin has an internally controlled weak pull-up
resistor.
MEMORY STICK INTERFACE
MS
O8
This pin is connected to the BS pin of the MS device.
Bus State
It is used to control the Bus States 0, 1, 2 and 3 (BS0,
BS1, BS2 and BS3) of the MS device.
MS
MS_SDIO/MS_
D0
I/O8PD
This pin is a bi-directional data signal for the MS device.
System
Most significant bit (MSB) of each byte is transmitted
first by either MSC or MS device.
Data In/Out
The bi-directional data signal has an internal weak pull-
down resistor.
MS
MS_D[3:1]
I/O8PD
This pin is a bi-directional data signal for the MS device.
System
The bi-directional data signals have internal weak pull-
down resistors.
Data In/Out
SMSC USB2231/USB2232
Revision 1.3 (07-12-05)
DATA1S5HEET
SMSC [ SMSC CORPORATION ]
