S1D13742 Epson, S1D13742 Datasheet - Page 104

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

Page 104
S1D13742
X63A-A-001-06
Time 1:
The main/background image is
in Buffer 1. Buffer 2 is empty.
The data output to the LCD
comes entirely from Buffer 1.
Background
image
Buffer 1
Buffer 2
Output
It is also possible to update a static window while double buffering is enabled, even in the
middle of a video stream. To do this:
• Write the last pixel of the current frame of video data.
• Set the Special Effects Register REG[36h] bits 7-6 to 01.
• Setup the Window Position Registers REG[38h] - REG[46h].
• Write the static data to the Memory Data Port REG[48h] - REG[49h].
This allows a static image to be written at any time, while still preventing the double
buffered window from tearing. Once the static window has been written, the user can go
back to writing the streaming video data by following the steps described above for using
the double buffer feature.
Input
Time 2:
The main/background image is
in Buffer 1. Buffer 2 is written
with video data. The data output
to the LCD comes entirely from
Buffer 1.
Background
image
Buffer 2
Buffer 1
Figure 18-2: Double Buffer Example
Revision 6.01 - EPSON CONFIDENTIAL
Output
Input
Time 3:
The main/background image is
in Buffer 1, but part of this data is
destructively overwritten by the
second frame of video data. The
static image data from Buffer 1 is
sent to the LCD, but the video
window comes from Buffer 2.
www.DataSheet.co.kr
Background
image
Buffer 1
Buffer 2
Output
Epson Research and Development
Hardware Functional Specification
Time 4:
A static PIP is destructively written
into Buffer 1. Since the most recently
updated video frame is in Buffer 1, the
entire image output to the LCD comes
from Buffer 1. There may be tearing in
the PIP window, but the video window
will not tear.
Input
Vancouver Design Center
Background
image
PIP
Buffer 1
Buffer 2
Issue Date: 2007/09/18
Output
Datasheet pdf - http://www.DataSheet4U.net/