DSB75 Development Support Board Rev. B1 Hardware Description
Confidential / Released
DSB75_hd_v12 Page 70 of 96 2008-08-26
5 Overview of Switches and Jumpers
This section provides an overview of all switches and jumpers located on DSB75. The exact
location of each switch and jumper is shown in
Figure 2 and Figure 43.
5.1 Overview of Switches
Table 32: Overview of switch positions
Function Reference
Switch position 1 Switch position 3
S110 Do not use this position! (reserved for
future use)
Source of VUSB_IN voltage is the DSB75
(5V)
Connects the VUSB_IN line directly to USB
connector X110 (VBUS)
S111
Do not use this position! (reserved for
future use)
Connects the USB_DN line to the USB-
OTG interface (D110, X111)
Connects the USB_DN line directly to USB
connector X110 (D-)
S112 Do not use this position! (reserved for
future use)
Connects the USB_DP line to the USB-
OTG interface (D110, X111)
Connects the USB_DP line directly to USB
connector X110 (D+)
S200 Using RXD0 line as ASC0-RXD
Connects B2B connector signal RXD0 to
the RS-232 transceiver D200 used for
asynchronous serial interface ASC0
Using USC2 line as ASC0-RXD
Connects B2B connector signal USC2 to
the RS-232 transceiver D200 instead of
RXD0
S201 Using TXD0 line as ASC0-TXD
Connects B2B connector signal TXD0 to
the RS-232 transceiver D200 used for
asynchronous serial interface ASC0
Using USC1 line as ASC0-TXD
Connects B2B connector signal USC1 to
the RS-232 transceiver D200 instead of
TXD0
S300 Using TXD1 line as SPI2 chip select
Connects B2B connector signal TXD1 to
the signal SPI2_CS at connector X510
pin 1
Using TXD1 line as ASC1-TXD or SD card
chip select (SPI mode)
Connects B2B connector signal TXD1 to
S301 pin 2
S301 Using TXD1 line as ASC1-TXD
Connects B2B connector signal TXD1 to
the RS-232 transceiver D201 used for
asynchronous serial interface ASC1 if
S300 is in position 3
Using TXD1 line as SD card chip select
(SPI mode)
Connects B2B connector signal TXD1 to the
card reader connector X301 pin 1 if S300 is
in position 3
S302 Using RXD1 line as SPI2 data in
Switch position 2: Connects B2B connector
signal RXD1 to the signal SPI2_DI at
connector X510 pin 3
Using RXD1 line as ASC1-RXD or SD card
data in (SPI mode)
Connects B2B connector signal RXD1 to
S303 pin 2
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