DSB75 Development Support Board Rev. B1 Hardware Description
Confidential / Released
DSB75_hd_v12 Page 71 of 96 2008-08-26
Function Reference
Switch position 1 Switch position 3
S303 Using RXD1 line as ASC1-RXD
Connects B2B connector signal RXD1 to
the RS-232 transceiver D201 used for
asynchronous serial interface ASC1 if
S302 is in position 3
Using RXD1 line as SD card data in (SPI
mode)
Connects B2B connector signal RXD1 to
the card reader connector X301 pin 2 if
S302 is in position 3
S304 Using RTS1 line as SPI2 clock
Connects B2B connector signal RTS1 to
the signal SPI2_SCLK at connector X510
pin 5
Using RTS1 line as ASC1-RTS or SD card
clock (SPI mode)
Connects B2B connector signal TXD1 to
S305 pin 2
S305 Using RTS1 line as ASC1-RTS
Connects B2B connector signal RTS1 to
the RS-232 transceiver D201 used for
asynchronous serial interface ASC1 if
S304 is in position 3
Using RTS1 line as SD card clock (SPI
mode)
Connects B2B connector signal RTS1 to the
card reader connector X301 pin 5 if S304 is
in position 3
S306 Using CTS1 line as SPI2 data out
Connects B2B connector signal CTS1 to
the signal SPI2_DO at connector X510
pin 7
Using CTS1 line as ASC1-RCS or SD card
data out (SPI mode)
Connects B2B connector signal TXD1 to
S307 pin 2
S307 Using CTS1 line as ASC1-CTS
Connects B2B connector signal CTS1 to
the RS-232 transceiver D201 used for
asynchronous serial interface ASC1 if
S306 is in position 3
Using CTS1 line as SD card clock (SPI
mode)
Connects B2B connector signal CTS1 to the
card reader connector X301 pin 7 if S306 is
in position 3
S450 Using SD_D0 line as SD card data0
Connects B2B connector signal SD_D0 to
SD card connector X301 pin 7
Using SD_D0 line as GPIO1
Connects B2B connector signal SD_D0 to
S460 pin 2
S451 Using SD_D1 line as SD card data1
Connects B2B connector signal SD_D1 to
SD card connector X301 pin 8
Using SD_D1 line as GPIO2
Connects B2B connector signal SD_D1 to
S461 pin 2
S452 Using SD_D2 line as SD card data2
Connects B2B connector signal SD_D2 to
SD card connector X301 pin 9
Using SD_D2 line as GPIO3
Connects B2B connector signal SD_D2 to
S462 pin 2
S453 Using SD_D3 line as SD card data3
Connects B2B connector signal SD_D3 to
SD card connector X301 pin 1
Using SD_D3 line as GPIO4
Connects B2B connector signal SD_D3 to
S463 pin 2
S454 Using SD_CLK line as SD card clock
Connects B2B connector signal SD_CLK to
SD card connector X301 pin 5
Using SD_CLK line as GPIO5
Connects B2B connector signal SD_CLK to
S464 pin 2
S455 Using SD_CMD line as SD card command
Connects B2B connector signal SD_CMD
to SD card connector X301 pin 2
Using SD_CMD line as GPIO6
Connects B2B connector signal SD_CMD to
S465 pin 2
S456 Using SPICS line as SPI1 chip select
Connects B2B connector signal SPICS to
pin 2 of the SPI connector X510 (signal
SPI1_CS)
Don’t use!
Connects B2B connector signal SPICS to
S466 pin 2
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