Table 4-7. Boot-Mode Pin Mapping; Table 4-8. Pll Reference Clock Selection Bootmode [2:0]; Table 4-9. Boot Device Selection Boot-Mode [6:3] - Texas Instruments AM64 SK EVM Series User Manual

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Bit 15 Bit 14 Bit 13 Bit 12
Reserv Reserv Backup Backup Boot Mode
ed ed Boot
Mode
Config
uration
• BOOT-MODE [0:2] – Denote system clock frequency for PLL configuration. By default, this bits are set for 25
MHz.
Table 4-8 gives details ON PLL reference clock selection.

Table 4-8. PLL Reference Clock Selection BOOTMODE [2:0]

SW3.6
OFF
OFF
OFF
OFF
ON
ON
ON
ON
• BOOT-MODE [3:6] – This provides primary boot mode configuration to select the requested boot mode after
POR, that is, the peripheral/memory to boot from.
SW3.2
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
ON
ON
ON
ON
ON
ON
ON
ON
• BOOT-MODE [10:12] – Select the backup boot mode, that is, the peripheral/memory to boot from, if primary
boot device failed.
Table 4-10 provides backup boot mode selection details.
SPRUIY9B – MAY 2021 – REVISED OCTOBER 2023
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Table 4-7. BOOT-MODE Pin Mapping

Bit 11 Bit 10 Bit 9 Bit 8
Primary Boot Mode
Configuration
SW3.7
OFF
OFF
ON
ON
OFF
OFF
ON
ON
Table 4-9

Table 4-9. Boot Device Selection BOOT-MODE [6:3]

SW3.3 SW3.4
OFF
OFF
OFF
OFF
ON
ON
ON
ON
OFF
OFF
OFF
OFF
ON
ON
ON
ON
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Bit 7 Bit 6 Bit 5 Bit 4
Primary Boot Mode
SW3.8
OFF
ON
OFF
ON
OFF
ON
OFF
ON
provides primary boot device selection details.
SW3.5
OFF OFF
OFF ON
ON OFF
ON ON
OFF OFF
OFF ON
ON OFF
ON ON
OFF OFF
OFF ON
ON OFF
ON ON
OFF OFF
OFF ON
ON OFF
ON ON
System Description
Bit 3 Bit 2 Bit 1 Bit 0
PLL Configuration
PLL REF CLK (MHz)
19.2
20
24
25
26
27
Reserved
No PLL Configuration Done (slow
speed backup)
Primary Boot Device
Selected
Reserved
OSPI
QSPI
SPI
Ethernet RGMII
Ethernet RMII
I2C
UART
MMC/SD card
emmc
USB
Reserved
GPMC NOR
PCIe
xSPI
No boot/Dev Boot
AM64x SK EVM 19