Ink /Cursor Architecture; Ink/Cursor Buffers; Ink/Cursor Data Format - Epson S1D13505F00A Technical Manual

12 I /C
NK URSOR

12.1 Ink/Cursor Buffers

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 posi-
tioned 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:
Ink/Cursor Start
Address Bits [7:0]
0
n = 255...1
The Ink/Cursor image is stored contiguously. The address offset from the starting word of line n to
the starting word of line n+1 is calculated as follows:
Ink Address Offset (words) = REG[04h] + 1
Cursor Address Offset (words) = 8

12.2 Ink/Cursor Data Format

The Ink/Cursor image is always 2 bit-per-pixel. The following diagram shows the Ink/Cursor data
format for a little-endian system.
2 bpp:
Byte 0
Byte 1
Host Address
The image data for pixel n, (A
(A , B )
n n
00
01
10
11 Inverted Background
S1D13505F00A HARDWARE FUNCTIONAL
SPECIFICATION (X23A-A-001-12)
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A
RCHITECTURE
Table 12-1 Ink/Cursor Data Format
Start Address (Bytes)
This default value is suitable for a cursor when there is
Display Buffer Size - 1024
no half-frame buffer.
These positions can be used to:
• position an Ink buffer at the top of the display buffer;
• position an Ink buffer between the image and half-
×
Display Buffer Size - (n 8192) frame buffers;
• position a Cursor buffer between the image and half-
frame buffers;
• select from a multiple of Cursor buffers.
bit 7 bit 0
A B A B A B A B
0 0 1 1 2 2 3 3
A B A B A B A B
4 4 5 5 6 6 7 7
Ink/Cursor Buffer
Figure 12-1 Ink/Cursor Data Format
, B ), selects the color for pixel n as follows:
n n
Table 12-2 Ink/Cursor Color Select
Color
Color 0
Ink/Cursor Color 0 Register, (REG[2Dh], REG[2Ch])
Color 1
Ink/Cursor Color 1 Register, (REG[2Fh], REG[2Eh])
Background
Ink/Cursor is transparent – show background
Ink/Cursor is transparent – show inverted background
EPSON
12: INK/CURSOR ARCHITECTURE
Comments
P P P P
3 P P P P
0 1 2 4 5 6 7
P = (A , B )
n n n
Panel Display
Comments
1-113