phyCORE-OMAP44xx
Part II: PCM-959/phyCORE-OMAP44xx Carrier Board
L-760e_1 © PHYTEC Messtechnik GmbH 2012
137
2.1.3.17 Boot Mode Selection (S1, S2)
Figure 43:
Boot Mode Selection Switches S1 and S2
The boot mode switches S1 and S2 are provided to allow changing the booting device order of the OMAP44xx
after a reset. They are connected to the X_BOOT[x] pins of the phyCORE-OMAP44xx. There are always two
switches connected to one X-BOOT input. One switch pulls X_BOOT[x] to LOW, and the second one to HIGH.
With both switches turned OFF the default value predefined by the resistor network on the phyCORE-OMAP44xx
is valid at the corresponding sys_boot configuration pin of the OMAP44xx. The following table shows the
possible settings of the first two switches S1_1 and S1_2 as an example, while table
relation between the switches and the X_BOOT pin of the phyCORE-OMAP44xx and the corresponding sys_boot
configuration pin of the OMAP44xx.