882 Video Test Instrument User Guide
(Rev A.35)
451
NCPP
Number Clocks Per Pixel
Class
Format parameter setting - Digital video signal
Description
Specifies the number of clocks per pixel (double-clocking factor for whole line). Some
industry standard formats (e.g. 480i) have pixel rates that are below the minimum pixel
rate restriction (of 25 MHz) required by the TMDS interface. In these cases, a feature
known as “double-clocking” is used to raise the TMDS clock rate to an acceptable
frequency.
Double-clocking is controlled by the NCPP format parameter. When NCPP is set to 1
(normal single-clocked), each pixel, output by the generator, is paired with one clock
pulse. In this case, the pixel rate is equal to the TMDS clock rate. By setting NCPP to 2
(double-clocked), two clocks are send during each pixel period and the TMDS clock rate is
raised to 2 times the pixel rate.
Note that double clocking with NCPP and pixel repetition (NPPP) cannot be applied at the
same time.
Command syntax
NCPP
factor
factor
1 or 2
Related commands
Example
NCPP 2
FMTU
Summary of Contents for 881
Page 1: ...881 882 Video Test Instrument User Guide 882E for HDMI ...
Page 12: ...10 Contents ...
Page 50: ...38 Chapter 1 Getting Started ...
Page 84: ...72 Chapter 2 Testing Video Displays ...
Page 99: ...882 Video Test Instrument User Guide Rev A 35 87 ...
Page 102: ...90 Chapter 3 Administrative Tasks ...
Page 107: ...882 Video Test Instrument User Guide Rev A 35 95 ...
Page 216: ...204 Chapter 5 Working with Formats ...
Page 248: ...236 Chapter 7 Working with Images ...
Page 264: ...252 Chapter 8 Working with Test Sequences ...
Page 382: ...40 Chapter 11 Testing EDID for HDMI 2 Expand the EDID Block in the navigation view ...
Page 446: ...104 Chapter 12 CEC Interactive Troubleshooting Environment ITE ...
Page 493: ...882 Video Test Instrument User Guide Rev A 35 151 ...
Page 591: ...882 Video Test Instrument User Guide Rev A 35 213 Commands by name ...
Page 687: ...882 Video Test Instrument User Guide Rev A 35 309 Example DVIC 23 FMTU ...
Page 1018: ...580 Appendix B Image Reference The EMITest5 image is shown below ...
Page 1094: ...656 Appendix B Image Reference ...
Page 1124: ...686 Appendix C Error Messages ...
Page 1140: ...702 Appendix D Format Reference ...