MultiCam Boards Documentation > GRABLINK series Documentation > GRABLINK Quickpack CFA Handbook > Connector Specifications > System Connectors > ISOA1, ISOA2 Isolated Input/Output Ports > Operating Modes > Open Emitter Digital Output Mode

Open Emitter Digital Output Mode

To be used as open emitter digital output, the circuit is either in State H (Force High) or in State D (Force Low) according to the applied digital level:

Applied digital level

Output State

HIGH

State H (Force High)

LOW

State D (Pull Down)

A state transition from State U (Pull-Up) occurs when setting IOE output mode after power ON or FPGA boot sequence.

In State D (Pull Down), the input is tied to the IGND through a 2 kΩ pull-down resistor.

Multiple open emitter digital outputs can be tied together.

CFAOpenEmittorDigitalOutput

Open emitter digital output state