sed1374 ETC-unknow, sed1374 Datasheet - Page 89

• Manufacturer Part Number: sed1374
• Description: Sed1374 Embedded Memory Color Lcd Controller
• Manufacturer: ETC-unknow

Epson Research and Development
Vancouver Design Center
12.2 Alternate SwivelView Mode
Hardware Functional Specification
Issue Date: 99/04/29
physical
memory
address
start
Figure 12-2: Relationship Between The Screen Image and the Image Refreshed by SED1374
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 SED1374 in the following sense:
A–B–C–D. The display is refreshed by the SED1374 in the following sense: B-D-A-C.
160
D
B
display
address
start
image refreshed by SED1374
2 x PCLK. Because of this, the power
240
X26A-A-001-02
SED1374
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