Altera DE1-SoC - Page 34

DE1-SoC User Manual
33
www.terasic.com
March 14, 2014
Figure 3-21 Connections between the FPGA and VGA
The timing specification for VGA synchronization and RGB (red, green, blue) data can be easily
found on website nowadays. Figure 3-21 illustrates the basic timing requirements for each row
(horizontal) displayed on a VGA monitor. An active-low pulse of specific duration is applied to the
horizontal synchronization (hsync) input of the monitor, which signifies the end of one row of data
and the start of the next. The data (RGB) output to the monitor must be off (driven to 0 V) for a
time period called the back porch (b) after the hsync pulse occurs, which is followed by the display
interval (c). During the data display interval the RGB data drives each pixel in turn across the row
being displayed. Finally, there is a time period called the front porch (d) where the RGB signals
must again be off before the next hsync pulse can occur. The timing of vertical synchronization
(vsync) is similar to the one shown in Figure 3-22, except that a vsync pulse signifies the end of
one frame and the start of the next, and the data refers to the set of rows in the frame (horizontal
timing). Table 3-14 and Table 3-15 show different resolutions and durations of time period a, b, c,
and d for both horizontal and vertical timing.
More information about the ADV7123 video DAC is available in its datasheet, which can be found
on the manufacturer’s website, or in the directory \Datasheets\VIDEO DAC of DE1-SoC System
CD. The pin assignment between the Cyclone V SoC FPGA and the ADV7123 is listed in Table
3-16.
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