P0307 Terasic Technologies Inc, P0307 Datasheet - Page 12

• Manufacturer Part Number: P0307
• Description: KIT DEV 4.3" LCD TOUCH PANEL
• Manufacturer: Terasic Technologies Inc

Specifications of P0307

• Accessory Type: NTSC/PAL TV Player
• For Use With/related Products: DE2, DE1
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: TRDB_LTM

Using the LTM
3-2 Input timing of the LCD panel display function
This section will describe the timing specification of the LCD synchronous signals and
RGB data.
To determine the sequencing and the timing of the image signals displayed on the LCD panel, the
corresponding synchronous signals from FPGA to the LCD panel should follow the timing
specification.
Figure 3.2 illustrates the basic timing requirements for each row (horizontal) that is displayed on
the LCD panel. An active-low pulse of specific duration (time
t
in the figure) is applied to the
hpw
horizontal synchronization (HD) input of the LCD panel, which signifies the end of one row of data
and the start of the next. The data (RGB) inputs on the LCD panel are not valid for a time period
called the hsync back porch (
) after the hsync pulse occurs, which is followed by the display
t
hbp
area (
). During the data display area the RGB data drives each pixel in turn across the row
t
hd
being displayed. Also, during the period of the data display area, the data enable signal (DEN)
must be driven to logic high. Finally, there is a time period called the hsync front porch (
) where
t
hfp
the RGB signals are not valid again before the next hsync pulse can occur.
The timing of the vertical synchronization (VD) is the same as shown in Figure 3.3, 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 3.2 and 3.3 show for different resolutions, the
durations of time periods
t
,
,
, and
for both horizontal and vertical timing. Finally, the
t
t
t
hpw
hbp
hfp
hd
timing specification of the synchronous signals is shown in the Table 3.4.
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