Epson S1D13504 manual Look-Up Table Data Register, Look-Up Table Bank Select Register

Epson Research and Development	Page 111
Vancouver Design Center

bits 3-0		LUT Address Bits [3:0]
		These 4 bits provide a pointer into the 16 position Look-Up Table currently selected for CPU
		read/write access.
		The Look-Up Table configuration (e.g. 1/2/4 banks) does not affect the read/write access from the
		CPU as all 16 positions can be accessed sequentially.
Look-Up Table Data Register
REG[26h]								RW
n/a	n/a		n/a	n/a	LUT Data	LUT Data	LUT Data	LUT Data
					Bit 3	Bit 2	Bit 1	Bit 0
bits 3-0		LUT Data Bits [3:0]
		These 4 bits are the gray shade/color values used for display data output. They are programmed into
		the 4-bit Look-Up Table positions pointed to by LUT Address bits [3:0] and RGB Index bits [1:0]
		(if in color display modes).
		For example: in a 16-level gray shade display mode, a data value of 0001b (4 bits-per-pixel) will
		point to Look-Up Table position one and display the 4-bit gray shade corresponding to the value
		programmed into that location.
Look-Up Table Bank Select Register
REG[27h]								RW
n/a	n/a		Red Bank	Red Bank	Blue Bank	Blue Bank	Green Bank	Green Bank
			Select Bit 1	Select Bit 0	Select Bit 1	Select Bit 0	Select Bit 1	Select Bit 0
bit 5-4		Red Bank Select Bits [1:0]
		In 2-bpp mode, the 16 position Red LUT is arranged into four, 4 position “banks.” These two bits
		control which bank is currently selected.
		In 8-bpp mode, the 16 position Red LUT is arranged into two, 8 position “banks.” Only bit 0 of
		these two bits controls which bank is currently selected.
		These bits have no effect in 1-bpp, 4-bpp, 15/16-bpp mode, or all monochrome modes.
bit 3-2		Blue Bank Select Bits [1:0]
		In both 2-bpp and 8-bpp modes, the 16 position Blue LUT is arranged into four 4 position “banks.”
		These two bits control which bank is currently selected.
		These bits have no effect in 1-bpp, 4-bpp, 15/16-bpp mode, or all monochrome modes.
bits 1-0		Green Bank Select Bits [1:0]
		In 2-bpp mode, the 16 position Green LUT is arranged into four, 4 position “banks.” These two bits
		control which bank is currently selected.

In 8-bpp mode, the 16 position Green LUT is arranged into two, 8 position “banks.” Only bit 0 of these two bits controls which bank is currently selected.

These bits have no effect in 1-bpp, 4-bpp, and 15/16-bpp modes.

Hardware Functional Specification	S1D13504
Issue Date: 01/01/30	X19A-A-002-18