SPC8106 S-MOS Systems, SPC8106 Datasheet - Page 139

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

bit 5
bits 4-2
bit 1
bit 0
SPC8106
08 Primary Revision Code Register RO
Primary
Revision
Code Bit 2
411-1.0
a. text modes 0 and 1 (slow dot clock) : If pixels are doubled from 320 to 640 the pixels are “undoubled”.
b. 400 line mode set, i.e. CRTC register 12h and associated overflow bits = 18Fh
c. graphics mode set, i.e. Graphics Controller register 06h bit 0 = 1
d. 16 point font is set, i.e. the 5 least significant bits of CRTC register 09h = 0Fh
e. 400 line mode is set, i.e. CRTC register 12h and associated overflow bits = 18Fh
f.
Primary
Revision
Code Bit 1
In 200 line modes the display stays at 200 lines. In 350 and 400 line modes only even lines are dis-
played. To avoid any loss of information in these modes a special double line font should be used.
text mode is set, i.e. Graphics Controller register 06h bit 0 = 0.
S-MOS Systems, Inc. • Tel: [phone] • Fax: [phone] • http://www.smos.com
Automatic Line and Pixel Doubling Disable
When this bit = 1 the following occurs:
Setting this bit affects both CRT and LCD operations. Line “undoubling” applies to both CRT and
LCD operations. Pixel “undoubling” applies to LCD operations only.
Reserved Test Bits
These test bits must always be programmed to 000b.
Graphics VExpand Enable
This bit is used to enable vertical expansion of 400 line graphics modes on the LCD display, using
selective line duplication. If this bit is 0, then vertical expansion of graphics modes is disabled. If
this bit is set to 1, then 400 line graphics modes are expanded vertically to fill the screen. All the fol-
lowing conditions must be true for graphics vertical expansion to occur:
If a 400 line graphics mode is not set, then graphics expansion will not occur and this bit will have
no effect. Note that if the first three conditions for graphics vertical expansion are met, then the
Auto Centering Enable bit (Auxiliary Register 01 bit 1) is ignored and autocentering is disabled.
If CRT mode is enabled (AUX[0B] bit 1 = 1) then graphics vertical expansion is disabled and this bit
has no effect.
Text VExpand Enable
This bit is used to enable vertical expansion of 400 line text modes on the LCD display, using selec-
tive line duplication. If this bit is 0, then vertical expansion of text modes is disabled. All the follow-
ing conditions must be true for text vertical expansion to occur:
If these conditions are not all met, then text expansion will not occur and this bit will have no effect.
If the conditions are met, then the Auto Centering Enable bit (Auxiliary Register 01 bit 1) is ignored
and autocentering is disabled.
If CRT mode is enabled (AUX[0B] bit 1 = 1) then text vertical expansion is disabled and this bit has
no effect.
Primary
Revision
Code Bit 0
graphics modes : If pixels are doubled from 320 to 640 (slow dot clock) the pixels are
“undoubled”. If lines are doubled from 200 to 400 (CRTC[09]b7=1) the lines are
“undoubled”. This also applies for mode 13h, where line doubling is achieved by set-
ting the font height to 1 in CRTC[09].
Graphics VExpand Enable = 1
Text VExpand Enable = 1
n/a
X12-SP-001-07
n/a
Monitor ID
Bit 2
Hardware Functional Specification
Monitor ID
Bit 1
Monitor ID
Bit 0
SP1-97