Look -U P Table (Lut); Look-Up Table Registers - Epson S1D13505F00A Technical Manual

4: LOOK-UP TABLE (LUT)
4 L -U T
OOK P
This section is supplemental to the description of the Look-Up Table architecture found in the
"S1D13505 Hardware Functional Specification". Covered here is a review of the LUT registers,
recommendations for the color and gray shade LUT values, and additional programming consider-
ations for the LUT. Refer to the "S1D13505 Hardware Functional Specification" for more detail.
The S1D13505 Look-Up Table is used for both the CRT and panel interface and consists of 256
indexed red/green/blue entries. Each entry is 4 bits wide. Two registers, at offsets 0x24 and 0x26,
control access to the LUT. Color depth affects how many indices will be used for image display.
In color modes, pixel values are used as indices to an RGB value stored in the Look-Up Table. In
monochrome modes only the green component of the LUT is used. The value in the display buffer
indexes into the LUT and the amount of green at that index controls the intensity. Monochrome
mode look-ups are done for the panel interface only. The CRT interface always receives the RGB
values from the Look-Up Table.

4.1 Look-Up Table Registers

REG[24h] Look-Up Table Address Register
LUT Address LUT Address LUT Address
Bit 7 Bit 6 Bit 5
LUT Address
The LUT address register selects which of the 256 LUT entries will be accessed. Writing to this reg-
ister will select the red bank. After three successive reads or writes to the data register this register
will be incremented by one.
REG[24h] Look-Up Table Address Register
LUT Data LUT Data LUT Data
Bit 3 Bit 2 Bit 1
LUT Data
This register is where the 4-bit red/green/blue data value is written or read. With each successive
read or write the internal bank select is incremented. Three reads from this register will result in
reading the red, then the green, and finally the blue values associated with the index set in the LUT
address register.
After the third read the LUT address register is incremented and the internal index points to the red
bank again.
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(LUT)
ABLE
LUT Address LUT Address LUT Address
Bit 4 Bit 3 Bit 2
LUT Data n/a n/a
Bit 0
EPSON
Read/Write
LUT Address LUT Address
Bit 1 Bit 0
Read/Write
n/a n/a
S1D13505 PROGRAMMING NOTES
AND EXAMPLES (X23A-G-003-05)