S1D13704 Epson Electronics America, Inc., S1D13704 Datasheet - Page 88

• Manufacturer Part Number: S1D13704
• Description: LCD Controller
• Manufacturer: Epson Electronics America, Inc.

Page 82
12.2 Alternate SwivelView Mode
S1D13704
X26A-A-001-06
physical
memory
address
start
Figure 12-2: Relationship Between The Screen Image and the Image Refreshed by S1D13704
image seen by programmer
= image in display buffer
C
A
SwivelView
window
Alternate SwivelView Mode may be used when the virtual image size of Default
SwivelView Mode cannot be contained in the 40kByte integrated frame buffer. For
example, the panel size is 240x160 and the display mode is 8 bit-per-pixel. The minimum
virtual image size for Default SwivelView Mode would be 240x256 which requires 60K
bytes. Alternate SwivelView Mode requires a panel size of only 240x160 which needs only
38,400 bytes.
Alternate SwivelView Mode requires the memory clock (MCLK) to be at least twice the
frequency of the pixel clock (PCLK), i.e. MCLK
consumption in Alternate SwivelView Mode is higher than in Default SwivelView Mode.
The following figure shows how the programmer sees a 240x160 image and how the image
is being displayed. The application image is written to the S1D13704 in the following
sense: A–B–C–D. The display is refreshed by the S1D13704 in the following sense: B-D-
A-C.
160
D
B
display
address
start
image refreshed by S1D13704
2 x PCLK. Because of this, the power
240
Epson Research and Development
Hardware Functional Specification
Vancouver Design Center
Issue Date: 02/02/01