S1D13742 Epson, S1D13742 Datasheet - Page 105

• Manufacturer Part Number: S1D13742
• Description: Mobile Graphics Engine
• Manufacturer: Epson

Epson Research and Development
Vancouver Design Center
Hardware Functional Specification
Issue Date: 2007/09/18
There are some limitations to double buffering:
• Consider the case where there is a video stream being input and the user wants to place a
• Consider the case where there is a video stream which stops after the last frame of video
• The user must either wait for a vertical non-display period between writing frames of
• Only one window can be double buffered at a time.
static PIP over all or some part of the video window. The user can write the PIP, but
when the video stream is continued, it will destructively overwrite the PIP, so that it will
appear as though the PIP is under the video window.
is sent. The final frame of video will continue to be displayed on the LCD. Assume that
this last frame is stored in Buffer 2. Now, if the user disables double buffering, the
buffer read pointer will immediately reset to Buffer 1. This means that the 2nd to last
frame will now be displayed instead of the last frame.
video data, or guarantee that their maximum input frame rate is 1/2 the LCD frame rate
and that the length of time it takes to burst write a frame of video data is less than one
LCD frame period.
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