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The first two trigger modes use a combination of the trigger inputs - the four GPIO inputs and the auxiliary SMA input. In the Capture software, these five inputs can be enabled independently and combined in three methods (AND, OR, and NAND). This combined trigger signal is the input for the edge/level and I/O decode detectors. The last trigger mode looks directly at the power trace and does not use these trigger inputs.
==== Edge/Level ====
The edge/level detector can trigger on four different events:
* Trigger input is low (0)
This mode is suitable when the target is using one of the GPIO pins as a trigger signal - if you have control over the target's source code, let it output a rising edge when the encryption or other operation begins.
==== I/O Decoder ====
The I/O decoder examines the trigger signal, assumes that it is either UART or SPI traffic, and outputs a trigger signal when it detects a certain pattern on the line. In the capture software, the settings for this decoder are:
* '''Baud''': What baud rate does this line use? This needs to be set manually.
When using this trigger mode, target IO1/IO2 are probably the best inputs to use: these are normally the serial TX and RX lines. It's possible to enable either one of these to trigger on sending or receiving data, respectively.
==== Sum of Absolute Differences (SAD) ====
Some targets don't have nice trigger signals to detect. Sad!
