Switches, Buttons and Jumpers 7
miriac SBC-LS1043A2 User Manual
V 2.2
61/72
© MicroSys Electronics GmbH 2017
7
Switches, Buttons and Jumpers
7.1
Boot Device Switch
The boot device can be selected by the switch “SW1”.
The boot device switches implement a maximum of four possible boot devices. The
following boot devices are supported by the LS1043A:
SW1 inverts the logic levels of the BOOT-SELx pins. By setting the switch to ON the
corresponding pin is actually pulled low (grounded).
The following table shows the internal connections of the BOOT-SEL pins:
SW1
ST4
Microcontroller
Switch
Signal
Pin
Signal
Pin
Name
1-1
BOOT-SEL1
→
T134
BOOT-SEL1
→
61
PTD4
1-2
BOOT-SEL2
→
T133
BOOT-SEL2
→
62
PTD5
Table 7-2 BOOT-SELx pin assignment
Setting
SW 1-1
SW 1-2
Boot
device
Features
Boot
location
OFF
OFF
SPI Flash
module
OFF
ON
NAND Flash
module
ON
OFF
SD/MMC
-
SD/MMC Bus width: 8 bit
SPI-CS0# [PIN-B70] is NOT ac-
cessible
-
carrier
board
ON
ON
SD/MMC
-
SD/MMC Bus width: 4 bit
SPI-CS0# [PIN-B70] is NOT ac-
cessible
-
carrier
board
Table 7-1 Boot device settings
Figure 7-1 Boot Device Switch
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