Epson Research and Development
Page 183
Vancouver Design Center
10.1 Image Buffer
The image buffer contains the formatted display mode data – see Section 11.1, “Display
Mode Data Format” on page 184.
The displayed image(s) may occupy only a portion of this space; the remaining area may
be used for multiple images – possibly for animation or general storage. Section 11,
“Display Configuration” on page 184 for the relationship between the image buffer and the
displayed image.
10.2 Ink Layer/Hardware Cursor Buffers
The Ink Layer/Hardware Cursor buffers contain formatted image data for the Ink Layer and
Hardware Cursor.
There may be several Ink Layer/Hardware Cursor images stored in the display buffer but
only one may be active at any given time.
For details see Section 14, “Ink Layer/Hardware Cursor Architecture” on page 197.
10.3 Dual Panel Buffer
In dual panel mode a buffer is required and allocated by hardware. With this Dual Panel
Buffer enabled, the top of the display buffer is allocated to the Dual Panel Buffer. The size
of the Dual Panel Buffer is a function of the panel resolution and whether the panel is color
or monochrome:
Dual Panel Buffer Size (in bytes) = (panel width x panel height) x factor / 16
where factor: = 4 for color panel
= 1 for monochrome panel
Note
Calculating the size of the Dual Panel Buffer is required to avoid overwriting the
Hardware Cursor/Ink Layer buffer.
Example 1:For a 640x480 8 bpp color panel the Dual Panel Buffer size is 75K bytes. In a
512K byte display buffer, the Dual Panel Buffer resides from 6D400h to
7FFFFh. In a 2M byte display buffer, the Dual Panel Buffer resides from
1ED400h to 1FFFFFh.
Hardware Functional Specification
Issue Date: 01/02/06
S1D13506
X25B-A-001-10
EPSON [ EPSON COMPANY ]
