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Table 4-1, Comx-p4080 boot mode options, Figure 4-4 – Artesyn COMX-P4080 Installation and Use (August 2014) User Manual

Page 58: Comx-p4080 power sequencing, Functional description

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Functional Description

COMX-P4080 COM Express Module Installation and Use (6806800L20C)

58

The power sequencing of the COMX-P4080 is different for the secure boot mode and the non-
secure boot mode. For the secure boot mode, POVDD should be tied to 1.5 V DC and is
powered at least 100 system clock cycles after the rising edge of power on reset signal. For
non-secure boot mode, POVDD should be tied to GND. The following figure illustrates this
process.

To set the boot mode, the first eight bits of the S1 switch are provided.

Figure 4-4

COMX-P4080 Power Sequencing

Table 4-1 COMX-P4080 Boot Mode Options

S1.1

RCW Source

ON

Secure boot mode

OFF (Default)

Non-secure boot mode