SPC8106 S-MOS Systems, SPC8106 Datasheet - Page 131

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

Mode Control (Index 17h)
bit 7
bit 3
bit 2
Attribute Controller Registers (3C0h, 3C1h)
Mode Control Register (Index 10h)
bit 6
bit 2
Color Plane Enable (Index 12h)
bits 5-4
Horizontal Panning Register (Index 13h)
bits 3-0
10.5 I/O Register Summary
This section summarizes the I/O registers of SPC8106 - only those register bits supported by the
chip are shown. Note that the functionality of a subset of the IBM VGA standard registers is sup-
ported, with an additional set of Auxiliary Registers containing SPC8106 specific functions. Only
details of the register functions which are not part of the VGA standard definition are given below.
Auxiliary Registers
SPC8106
Auxiliary Index/Data Register
3DEh RW
n/a
00 Extended Function Register 0 RW
RGBI Mode
Enable
Unless otherwise noted, all read/write register bits are cleared to 0 after a RESET.
All register bits marked as “n/a” are undefined. There is no effect if they are written to, and
reading these bits will return an undefined value.
411-1.0
3DFh RW
n/a
12 Bit RGB
Mode Enable
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Enable Retraces
Read only as 1. Retraces always enabled.
Count-by-2
Read/write only. No other effect in hardware.
HRTC/2 Select
Read/write only. No other effect in hardware.
Pel Width
Read/write only. No other effect in hardware.
Line Graphics 8>9 Dot
For LCD-only modes (AUX[0B] bits 1,0 = 01) - Read/write only. No other effect in hardware.
For CRT modes, this bit enables 8-9 dot copy for line graphics characters in text mode.
Video Status MUX. Read only 0,0. IBM diagnostic use only.
Horizontal Panning Bit 3-0
For non-CRT modes (AUX[0B] bit 1 = 0) or if forced 8-dot mode (AUX[01] bit 7 = 1), a panning
value of greater than 7 will have the same effect as a panning value of 0.
n/a
TFT Enable Test Mode
Auxiliary
Index
Bit 4
Enable
(must = 0)
X12-SP-001-07
Auxiliary
Index
Bit 3
n/a
Auxiliary
Index
Bit 2
IRQ Output
Enable
Hardware Functional Specification
Auxiliary
Index
Bit 1
Multi-Font
Enable
Auxiliary
Index
Bit 0
LCD B Reg
Program
Enable
SP1-89