Gpio (General Purpose Inputs And Outputs); Overview; Lut (Look Up Table) - JAI AT-200GE User Manual

7. GPIO (General purpose inputs and outputs)

In chapter 7, there are some examples of settings. The values shown in these examples
may need to be adjusted to fit the pixel clock specifications of this particular model.

7.1. Overview

All input and output signals pass through the GPIO (General Purpose Input and Output) module.
The GPIO module consists of a Look-Up Table (LUT – Cross-Point Switch), 4 Pulse Generators
and a 12-bit counter. In the LUT, the relationship between inputs, counters and outputs is
governed by internal register set-up.
Digital I/O(GPIO) setting
LVAL IN
DVAL IN
FVAL IN
EEN IN
OPT IN 1
OPT IN 2
TTL IN 1
LVDS IN 1
Soft Trigger 0
Soft Trigger 1
Soft Trigger 2
Soft Trigger 3
Pulse Generator 0
Pulse Generator 1
Setting for
Line Source
Counter Clock Source
Pixel Clock
1
On the above block diagram, Trigger 0 is used for Exposure and Trigger 1 is used for Delayed
Readout. The Time Stamp Reset can reset the time stamp in compliance with the GigE Vision
standard. This is used for having the same time stamp in case of using multiple cameras.
The blocks shown in the above diagram have the following functionality:

7.1.1 LUT (Look Up Table)

The LUT works as a cross-point switch, which allows connecting inputs and outputs freely.
The signals LVAL_IN, DVAL_IN, FVAL_IN and EEN_IN all originate from the camera timing
circuit. Trigger 0 is connected to the camera's timing circuit and is used for initiating
triggered exposure. Trigger 1 is used for Delayed Readout mode. The Time Stamp Reset
signal is used to reset the camera's time stamp function, also making it possible to reset and
synchronize the time stamp of multiple cameras.
( Cross Point Switch )
Pulse Generator 1
(20 bit Counter )
Pulse OUT
Pulse Generator 0
(20 bit Counter )
12 bit
Counter
Counter Divide by value
0 Bypass
1 - 4095
AT-200GE
LUT
- 15 -
Digital I/O(GPIO) setting
TRIGGER 1
TRIGGER 2
TTL OUT 1
TTL OUT 2
OPT OUT 1
OPT OUT 2
Time Stamp Reset
Sequence Reset
Pulse Generator 0
Pulse Generator 1
Setting for
Line Selector
Pulse trigger IN
Pulse Generator Setting 1
Pulse Generator Setting 0
Length counter 0
Start Point Counter 0
Repeat Counter 0
End point counter 0
Counter 0 clear