SPC8106 S-MOS Systems, SPC8106 Datasheet - Page 182

• Manufacturer Part Number: SPC8106
• Description: LCD/CRT VGA CONTROLLER
• Manufacturer: S-MOS Systems

3.0
The SPC8106 is a single chip 5 Volt LCD/CRT video controller based on VGA architecture and
optimized for driving an LCD panel display. VGA standard mode functionality is supported using
standard IBM VGA parameters. A proprietary 256 x 6-bit gray-scale lookup table is provided to
allow remapping of the 64 possible gray shades displayed on a monochrome LCD panel. A 256 x
12-bit lookup table (4 bits per primary) provides 256 out of a possible 4096 colors on a color LCD
panel.
The target market for this device is notebook computers, or other specialized consumer products.
The ability to run all VGA software on a 640x480 LCD panel display is the major design consider-
ation, therefore the BIOS must perform the same functions that the IBM VGA BIOS performs
within the limitations of the SPC8106.
The BIOS is divided into 3 major sections: the main BIOS, the VESA Extensions and the Sollex
Extensions. It requires 32 KB of EPROM space, decoded by the system board.
3.1
The main BIOS contains the core VGA compatible information. It requires 24 KB of the total 32
KB of EPROM space. This main BIOS is responsible for the initialization of the chip and for per-
forming the IBM compatible function calls. It contains the Video Parameter Tables and the Char-
acter Tables.
3.2
The VESA Extensions are found in the last 8 KB of the 32 KB. This contains the VESA compatible
functions as defined by the Video Electronics Standards Association. At time of printing the BIOS
conforms to the Video BIOS Extensions Standard 1.2. These VESA functions are responsible for
setting non-IBM modes and supplying functions for mode information. More information on VESA
can be obtained by contacting the Video Electronics Standards Association located in San Jose,
CA.
3.3
The Sollex Extensions are defined by Seiko Epson Corporation to augment the functionality of the
BIOS to include panel and power down functions. This also resides in the last 8 KB. More infor-
mation on Sollex can be found in the SOLLEX Specification Drawing Office No. S03-SP-001-xx.
BIOS Functional Specification
SP2-12
OVERVIEW DESCRIPTION
Main BIOS
VESA Extensions
Sollex Extensions
S-MOS Systems, Inc. • Tel: [phone] • Fax: [phone] • http://www.smos.com
X12-SP-002-03.1
411-1.0
SPC8106