S1D13505 Epson Electronics America, Inc., S1D13505 Datasheet - Page 139
S1D13505
Manufacturer Part Number
S1D13505
Description
LCD Controller
Manufacturer
Epson Electronics America, Inc.
Datasheet
1.S1D13505.pdf
(566 pages)
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Epson Research and Development
Vancouver Design Center
12 Ink/Cursor Architecture
12.1 Ink/Cursor Buffers
12.2 Ink/Cursor Data Format
Hardware Functional Specification
Issue Date: 01/02/02
2 bpp:
Host Address
Byte 0
Byte 1
The Ink/Cursor buffers contain formatted image data for the Ink Layer or Hardware Cursor. There
may be several Ink/Cursor images stored in the display buffer but only one may be active at any
given time.
The active Ink/Cursor buffer is selected by the Ink/Cursor Start Address register (REG[30h]). This
register defines the start address for the active Ink/Cursor buffer. The Ink/Cursor buffer must be
positioned where it does not conflict with the image buffer and half-frame buffer. The start address
for the Ink/Cursor buffer is programmed as shown in the following table:
The Ink/Cursor image is stored contiguously. The address offset from the starting word of line n to
The Ink/Cursor image is always 2 bit-per-pixel. The following diagram shows the Ink/Cursor data
format for a little-endian system.
the starting word of line n+1 is calculated as follows:
Address Bits [7:0]
Ink/Cursor Start
n = 255...1
Ink Address Offset (words) = REG[04h] + 1
Cursor Address Offset (words) = 8
0
bit 7
A
A
0
4
B
B
Figure 12-1: Ink/Cursor Data Format
0
4
A
A
Ink/Cursor Buffer
Display Buffer Size - 1024
1
5
Start Address (Bytes)
Display Buffer Size -
Table 12-1: Ink/Cursor Start Address Encoding
B
B
1
5
(n
A
A
2
6
8192)
B
B
2
6
A
A
3
7
bit 0
B
B
3
7
This default value is suitable for a cursor
when there is no half-frame buffer.
These positions can be used to:
• position an Ink buffer at the top of the
• position an Ink buffer between the image
• position a Cursor buffer between the image
• select from a multiple of Cursor buffers.
display buffer;
and half-frame buffers;
and half-frame buffers;
P
0
P
1
P
2
P
3
P
P
Panel Display
n
4
P
= (A
Comments
5
P
6
n
, B
P
7
n
)
X23A-A-001-14
S1D13505
Page 133
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