sed1355 ETC-unknow, sed1355 Datasheet - Page 130

• Manufacturer Part Number: sed1355
• Description: Sed1355 Embedded Ramdac Lcd/crt Controller
• Manufacturer: ETC-unknow

Page 124
9.1 Image Buffer
9.2 Ink/Cursor Buffers
9.3 Half Frame Buffer
SED1355
X23A-A-001-11
The image buffer contains the formatted display mode data – see “Display Mode Data Formats”.
The displayed image(s) could take up only a portion of this space; the remaining area may be used
for multiple images – possibly for animation or general storage. See “Display Configuration” on
page 125 for the relationship between the image buffer and the display.
The Ink/Cursor buffers contain formatted image data for the Ink or Cursor. There may be several
Ink/Cursor images stored in the display buffer but only one may be active at any given time. See
“Ink/Cursor Architecture” on page 134 for details.
In dual panel mode, with the half frame buffer enabled, the top of the display buffer is allocated to
the half-frame buffer. The size of the half frame buffer is a function of the panel resolution and
whether the panel is color or monochrome type:
Half Frame Buffer Size (in bytes) = (panel width x panel length) * factor / 16
where factor
For example, for a 640x480 8 bpp color panel the half frame buffer size is 75K bytes. In a 512K byte
display buffer, the half-frame buffer resides from 6D400h to 7FFFFh. In a 2M byte display buffer,
the half-frame buffer resides from 1ED400h to 1FFFFFh.
= 4 for color panel
= 1 for monochrome panel
Epson Research and Development
Hardware Functional Specification
Vancouver Design Center
Issue Date: 99/05/18