Specifications

C2-1000 SERIES OPERATION MANUAL

This option changes the total number of image pixels on one line of monitor video

including the Horizontal sync pulse and blanking time. This is normally in a multiple

of 8. It is very important to get this value correct, or many digital display devices,

such as TFT monitors, will display an image with an odd moiré effect – such as soft

vertical bands spread evenly across the image.

This menu controls the total number of lines of video present in the image which

includes the vertical Sync pulse, the blanking period and the active video. Changing

this option affects the final vertical sync frequency.

A video frame includes both the active area, the portion of the image normally

containing useful visual information, and a resolution value for a given display

standard which only expresses the number of pixels visible in an image.

The well-known 800 x 600 computer resolution standard simply means that there are

800 pixels/line visible horizontally and there are 600 lines visible vertically.

This item provides a way to change the number of active pixels and lines.

There is a period of time between the end of the Horizontal Sync pulse and the start

of Active Video. This portion of the waveform signal is called the “Back Porch”, a

term originating with the television broadcasting industry and its RS-170A

specification. In practice, this will control where the video image starts on the left

side of the monitor without changing the width of the sync pulse itself (another way to

control where the image area starts). The two parameters control where the back

porch is positioned and they interact to a degree.

By adjusting these parameters, you control the start of the back porch (with respect

to the trailing edge of Horizontal Sync) and also its width. The place where the Back

Porch begins with respect to the Horizontal Sync pulse and the width of the Back

Porch have a direct bearing on where the active (visible) portion of the image begins.

Do not attempt this adjustment without monitoring the results with an oscilloscope.

800 x 600 60 Hz

Clks/l [1056] = 40.000MHz

800 x 600 60 Hz

Lines/f [ 628] = 60.317 Hz

800 x 600 60 Hz

H/V active [ 800] x 600

800 x 600 60 Hz

H/V Start [ 88] x 23