Table 8-6: Id Bit Usage; Table 8-7: Look-Up Table Access - Epson S1D13503 Technical Manual

Page 70
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AUX[0E] Look-Up Table Address Register
I/O address = 1110b, Read/Write
Green Bank Green Bank
Bit 1 Bit 0
The S1D13503 has three internal 16 position, 4-bit wide Look-Up Tables (palettes). The 4-bit value programmed into each
table position determines the output gray shade / color weighting of display data. These tables are bypassed in black-and-
white (BW) display mode.
These three 16 position Look-Up Tables can be arranged in many different configurations to accommodate all the gray
shade / color display modes.
Refer to Look-Up Table Architecture on page 72 for formats.
bits 7-6
bits 5-4
S1D13503
X18A-A-001-08
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ID Bit / ID Bit /
RGB Index RGB Index
Bit 1 Bit 0
Green Bank Bits [1:0]
In 4-level gray / color display modes (2-bits/pixel), the 16 position Green palette is arranged into four, 4
position "banks". These two bits control which bank is currently selected. These bits have no effect in 16-
level gray / color display modes (4-bits/pixel).
In 256 color display modes (8-bit/pixel), the 16 position Green palette is arranged into two, 8 position
"banks" for the display of "green" colors. Only bit 0 of these two bits controls which bank is currently
selected.
ID Bit / RGB Index Bits [1:0]
These bits have dual purpose;
ID Bits: After power on or hardware reset, these bits can be read to identify the S1D13503. These same
bits are used to identify the pin compatible S1D13502 and would only be used in system implementations
where common software is being used. As these bits are R/W they must be read before being written in
order to be used as ID bits.
S1D13503
Power On or
RESET
S1D13502
S1D13502
RGB Index bits [1:0]: These bits are also used to provide access to the three internal Look-Up Tables
(RGB).

Table 8-7: Look-Up Table Access

Aux[0E]
bit 5 bit 4
0 0
0 1
1 0
1 1
Palette Palette
Address Address
Bit 3 Bit 2

Table 8-6: ID Bit Usage

Chip
bit 5
0
F352 0
1
1
Look-Up Table Access
Auto-increment (see Note 1)
Red palette R/W access
Green palette R/W access
Blue palette R/W access
Epson Research and Development
Vancouver Design Center
Palette Palette
Address Address
Bit 1 Bit 0
Aux[0E]
bit 4
0
1
0
1
Hardware Functional Specification
Issue Date: 01/01/29