Switches; Boot Select (Sw1); Microsd Card Write Protection (Sw2); Pcie Spread Spectrum Clocking -0.5% (Sw2: 2-3) - Kontron pITX-iMX8M User Manual

6.12. Switches

6.12.1. Boot Select (SW1)

The Boot Select Switch SW 1 determines the iMX8M boot modes.

Table 25: Boot Select Switch (SW1)

SW1: 2-3 SW1: 1-4
OFF OFF
OFF ON
ON OFF
ON ON

6.12.2. MicroSD Card Write Protection (SW2)

Table 26: MicroSD Card Write Protection Switch

SW2: 1-4 SDIO_WP
OFF 0
ON 1

6.12.3. PCIE Spread Spectrum Clocking -0.5% (SW2: 2-3)

Table 27: PCIE Spread Spectrum Clocking -0.5% Switch

SW2: 2-3 CLK_GEN_ SS_EN
OFF 0
ON 1

6.13. Buttons

6.13.1. External ON-OFF Button (J24)

Table 28: External ON-OFF Button

Pin Function
1 ON-OFF
2 GND
iMX8M SCU iMX8M SCU
Boot Mode 1 Boot Mode 0
0 0
0 1
1 0
1 1
Description
MicroSD card write protection is disabled.
MicroSD card write protection is active
Description
PCIe clock generator spread spectrum clock is
disabled.
PCIe clock generator -0.5% spread spectrum
clocking is enabled.
Direction
IN
Ground
Description
Boot from fuse (default)
Serial Downloader
Internal Boot (Development)
Reserved
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