參數(shù)資料
型號(hào): S1D13706
廠商: 愛普生(中國(guó))有限公司
英文描述: S1D13706 Embedded Memory LCD Controller
中文描述: S1D13706 LCD控制器的嵌入式存儲(chǔ)器
文件頁數(shù): 138/152頁
文件大?。?/td> 1784K
代理商: S1D13706
Page 138
Epson Research and Development
Vancouver Design Center
S1D13706
X31B-A-001-09
Hardware Functional Specification
Issue Date: 2004/02/09
12 SwivelView
12.1 Concept
Most computer displays are refreshed in landscape orientation – from left to right and top
to bottom. Computer images are stored in the same manner. SwivelView is designed to
rotate the displayed image on an LCD by 90
°
, 180
°
, or 270
°
in an counter-clockwise
direction
.
The rotation is done in hardware and is transparent to the user for all display
buffer reads and writes. By processing the rotation in hardware, SwivelView offers a
performance advantage over software rotation of the displayed image.
The image is not actually rotated in the display buffer since there is no address translation
during CPU read/write. The image is rotated during display refresh.
12.2 90° SwivelView
90
°
SwivelView requires the Memory Clock (MCLK) to be at least 1.25 times the
frequency of the Pixel Clock (PCLK), i.e. MCLK
1.25PCLK.
The following figure shows how the programmer sees a 320x480 portrait image and how
the image is being displayed. The application image is written to the S1D13706 in the
following sense: A–B–C–D. The display is refreshed by the S1D13706 in the following
sense: B-D-A-C.
Figure 12-1: Relationship Between The Screen Image and the Image Refreshed in 90
°
SwivelView.
image seen by programmer
= image in display buffer
480
SwivelView
window
4
320
A
B
C
D
D
C
B
A
3
S
w
display start address
(panel origin)
image refreshed by S1D13706
physical memory
start address
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