Global shutter multiple camera synchronization documentation

[justinblaber]

Was taking a look at: https://www.raspberrypi.com/documentation/accessories/camera.html

Was wondering if there is more information on the roles of XHS, XVS, and XTRIG in synchronized capture? Coming from USB machine vision cameras usually a single GPIO pin is used to start capture at the same time for multiple cameras, so was trying to find more info on the specific roles of XHS, XVS, and XTRIG. XTRIG and XVS in particular seem very similar in description (synchronizes start of exposure?) and XHS seems like it should be specifically for rolling shutter (synchronizes start of each line?) although the docs mention it's also used for GS cameras which seems contradictory. I've googled around but it's difficult to find info on this topic. If anyone has any info or docs they could link that would be great.

[lurch]

ping @davidplowman and @naushir

[naushir]

XTRIG is a trigger used for external flash strobing whereas XVS/XHS are used as sync pulses. Sadly we cannot share datasheets as they are under an NDA with Sony.