Gpio; Boot Mode Control; Description Of Timing Parameters For The Strapping Pins; Visualization Of Timing Parameters For The Strapping Pins - Espressif Systems ESP32-C6 Series Hardware Design Manuallines

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Regarding the timing requirements for the strapping pins, there are such parameters as setup time and hold time.
For more information, see Table
Table 4: Description of Timing Parameters for the Strapping Pins
Parameter Description
Setup time is the time reserved for the power rails to stabilize before
t
SU
the CHIP_PU pin is pulled high to activate the chip.
Hold time is the time reserved for the chip to read the strapping pin
t values after CHIP_PU is already high and before these pins start
H
operating as regular IO pins.
CHIP_PU
Strapping pin
Figure 12: Visualization of Timing Parameters for the Strapping Pins
Notice:
Please do not add high-value capacitors at GPIO9, otherwise the chip might enter Download Boot mode when booted
for the first time.

2.8 GPIO

Note:
The content below is excerpted from
The pins of ESP32-C6 series can be configured via IO MUX or GPIO matrix. IO MUX provides the default pin
Espressif Systems
Table 3: Boot Mode Control
Boot Mode
Default Configuration – (Floating)
SPI Boot (default)
Download Boot
1
Invalid combination
1
This combination triggers unexpected behavior
and should be avoided.
4 and Figure 12.
t
SU
V
IL_nRST
V
IH
ESP32-C6 Series Datasheet
15
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GPIO8 GPIO9
1 (Pull-up)
Any value 1
1 0
0 0
t
H
> Section Pins.
ESP32-C6 Series Hardware Design Guidelines v1.0
Min (ms)
0
3