Appendix 1 - Defining Custom Modes - Datapath ImageDP4 User Manual

Appendix 1 - Defining Custom Modes

Defining custom modes is carried out using the Custom Mode Utilities tool that can be found on the
Datapath CD. The latest version may also be downloaded from the Datapath website:
www.datapath.co.uk
The Custom Modes tool is a utility for defining custom modes that can be generated by the ImageDP4
graphics card. The custom modes tool must be used on a system where the active display driver supports
custom modes. To generate a custom mode the following values must be entered into the utility
application dialog box:
• X Resolution - The active display width in pixels.
• Y Resolution - The active display height in lines.
• Refresh - The refresh rate displayed in the Display Properties dialog. Also used for calculating the
dot-clock if no value is provided.
• Horizontal Front Porch - The horizontal front porch in pixels.
• Horizontal Sync Width - The H-Sync width in pixels.
• Horizontal Back Porch - The horizontal back porch in pixels.
• Vertical Front Porch - The vertical front porch in lines.
• Vertical Sync Width - The v-sync width in lines.
• Vertical Back Porch - The vertical back porch in lines.
• Horizontal Sync Polarity - 0 = negative, 1 = positive
• vertical Sync Polarity - 0 = negative, 1 = positive.
• Dot Clock (optional) - The pixel dot-clock in KHz. This is calculated from the Refresh rate if not
provided.
Note:
If a new mode is created or an existing one amended, then the Display Properties dialog must be closed
and re-opened to ensure the new values are refreshed in the display driver.
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