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Advanced Topics

Quadro SDI Output PG-03776-001_v06 | 68

10.7 DATA INTEGRITY CHECK

The Quadro SDI provides the capability to test the integrity of the data cable between

the graphics card and the SDI daughter board. When this mode is enabled, the SDI

daughter card compares the color value of each pixel on a line to the color of the first

pixel on that line and returns a count of the number of mismatched pixels. Due to the

serial structure of the data cable, this test is designed to catch cases where the quality of

the cable introduces errors into the data stream. An application that wishes to utilize this

mode to verify the integrity of the data cable should display a test pattern that draws

pixels of the identical color on each output line and be structured in the following form:





Note: This feature is only available on the Quadro FX 4500, Quadro FX 5500,

Quadro FX 4600 and Quadro FX 5600 SDI.

Code Listing 48: Basic Code Structure for Data Integrity Check

void runDataIntegrityCheck()

{

// Initialize video device

initializeVideo();

// Initialize OpenGL state

initializeGL();

// Draw initial frames

for (int I = 0; I < 30; i++) {

drawPattern();

}

// Enable data integrity checking

enableDataCheck();

// Draw remaining frames

for (int i = 0; i < gNumFrames; i++) {

drawPattern();

}

// Check errors

checkErrors();

// Disabled data integrity checking

disableDataCheck();

// Draw last frame

drawPattern();

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