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2 video display counters – Texas Instruments TMS320C64x DSP User Manual

Page 150

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Video Display Mode Selection

4-5

Video Display Port

SPRU629

Figure 4–4. Progressive Blanking Intervals and Video Area

Field 1 Image Width

Field 1

Frame

Field 1 Image Height

Field 1 Vertical Blanking

Field 1 Image Vertical Offset

Field 1 Active Video

4.1.2

Video Display Counters

To generate the image timing, the video display module uses five counters:

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Frame line counter (FLCOUNT)

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Frame pixel counter (FPCOUNT)

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Image line counter (ILCOUNT)

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Image pixel counter (IPCOUNT)

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Video clock counter (VCCOUNT)

The frame line counter (FLCOUNT) counts the total number of lines per frame
including vertical blanking intervals. The frame pixel counter (FPCOUNT)
counts the total number of pixels per line including horizontal blanking inter-
vals. FLCOUNT begins counting at the start of the vertical blanking interval of
the first field. FPCOUNT begins counting at the end of the horizontal blanking
interval of each line. They are reset when they reach their stop values as speci-
fied in the video display frame size register (VDFRMSZ).