S1D13742 Epson, S1D13742 Datasheet - Page 55

• Manufacturer Part Number: S1D13742
• Description: Mobile Graphics Engine
• Manufacturer: Epson

Epson Research and Development
Vancouver Design Center
9.3.4 Input Mode Register
bit 7
Hardware Functional Specification
Issue Date: 2007/09/18
REG[2Ah] Input Mode Register
Default = 01h
Memory Data
Format
7
6
Note
Memory Data Format
This bit determines how the data is stored in memory
When this bit = 0, the data stored in memory is 16 bpp. In this case 18 bpp input data will
be truncated to 16 bpp
When this bit = 1, the data stored in memory is 18 bpp. In this case 16 bpp input data (as
determined by bits 3-0) will be expanded to 18 bpp.
In 18-bpp mode, memory above $A0000h is reserved for 2 bits of each 18 bit pixel.
Therefore the maximum display resolution supported can be calculated as follows:
X x Y x 2 ≤ 640KB
In 16-bpp mode the entire 768K Byte display buffer is available and therefore the maxi-
mum display resolution is X x Y x 2 ≤ 768KB
n/a
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