Setting Up Vga Input; Graphics Resolution Detection; Automatic Clock Frequency Detection; Auto Position - Magni MCP-601 Operator's Manual

MCP-601 Operator's Manual

Setting up VGA input

Graphics Resolution Detection

The MCP-601 features auto-detection and auto-positioning of the graphics display. The unit continuously
measures the horizontal and vertical sync frequencies looking for any changes. As long as there is no change
in frequency no additional action is taken. When there is a change in sync frequency, the MCP-601 will react
differently depending on whether the DVI or VGA input is selected. DVI input is the more precise since the
signal contains all the needed data in the signal to determine the width, height and pixel clock of the image.
For VGA, the process is more involved. Only the horizontal sync and vertical sync information are known.
A lookup table must be used to determine the width, height and pixel clock. Fortunately, the VESA standards
that the MCP-601 supports have unique enough rates that simply looking through the table will find the
correct settings. The MCP-601 provides the user the ability to create custom VGA settings, for instance, a
720 x 480 NTSC size image. For most PC's, the clock rates for the 720 x 480 are similar to the 640 x 480
size image. A priority is being setup in the menu to resolve between settings. The resolution setting with the
high priority is to be used. This enables multiple settings to be kept and selected with the priority setting.
The priority setting can be entered via the IR remote control by going to Menu, Display. Select the automatic
settings table value and press Enter to move to the priority position. Move the left or right Arrow key to
change the priority. Then go to the User table and set the similar setting to the opposite priority. When a
resolution change is detected, the unit will go to the table setting with the high priority.

Automatic Clock Frequency Detection

The clock frequency for the user settings can be automatically determined. Go to the Magni Premier
application software and follow the procedure under the Config. Tab, Change Display button. Once this is
complete the frequency will show on the Menu, Display, User settings.

Auto Position

Once the size and clocks have been determined, the position of the picture is determined. The positioning of
the graphics picture can be: Automatic when a change in the sync is found, manually invoked or set to user
specified position.
The automatic positioning requires a graphics picture from the PC. For DVI, the minimum signal amplitude
needs to be 13% of full brightness on all components. For VGA, the minimum signal for the blue component
needs to be 50% of full brightness. When a resolution change is detected with auto position enabled (Menu,
Display, AutoPos Enable, ON) or the AutoPos is invoked (Menu, Display, AutoPos Now), the MCP-601 will
look for the leading edge of the signal after finding the sync in both the horizontal and vertical axis. Once
found, the positions for each resolution are stored into the lookup tables and in the offset registers.

Manual Positioning

The user can also manually input the specific horizontal and vertical positions for the image. The auto
position function must be turned off. (Menu, Display, AutoPos Enable, OFF) The MCP-601 will then simply
load the supplied position into the offset registers. The user-supplied values are over written if Menu,
Display, AutoPos Now is invoked or Menu, Display, AutoPos Enable is set to ON. The positioning function
is executed once after a change of sync and picture size is detected.
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