pITX-iMX8M – User Guide Rev. 1.4
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// 44
6.12.
Switches
6.12.1.
Boot Select (SW1)
The Boot Select Switch SW 1 determines the iMX8M boot modes.
Table 27: Boot Select Switch (SW1)
SW1: 2-3
SW1: 1-4 iMX8M SCU
Boot Mode 1
iMX8M SCU
Boot Mode 0
Description
OFF
OFF
0
0
Boot from fuse (default)
OFF
ON
0
1
Serial Downloader
ON
OFF
1
0
Internal Boot (Development)
ON
ON
1
1
Reserved
6.12.2.
MicroSD Card Write Protection (SW2)
Table 28: MicroSD Card Write Protection Switch
SW2: 1-4
SDIO_WP
Description
OFF
0
MicroSD card write protection is disabled.
ON
1
MicroSD card write protection is active
6.12.3.
PCIE Spread Spectrum Clocking -0.5% (SW2: 2-3)
Table 29: PCIE Spread Spectrum Clocking -0.5% Switch
SW2: 2-3
CLK_GEN_ SS_EN
Description
OFF
0
PCIe clock generator spread spectrum clock is
disabled.
ON
1
PCIe clock generator -0.5% spread spectrum
clocking is enabled.
6.13.
Buttons
6.13.1.
External ON-OFF Button (J24)
Table 30: External ON-OFF Button
Pin
Function
Direction
1
ON-OFF
IN
2
GND
Ground
Содержание 44011-0208-13-2
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