SPC8106 S-MOS Systems, SPC8106 Datasheet - Page 148

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

Sequencer Registers
Hardware Functional Specification
Sequencer Index/Data Register
3C4h RW
n/a
00 Reset Register RW
n/a
01 Clocking Mode Register RW
n/a
02 Map Mask Register RW
n/a
03 Character Map Select Register RW
n/a
04 Memory Mode Register RW
n/a
SP1-106
index 01 Clocking Mode Register bits 4, 2, 1 are read/write bits that have no effect in hardware.
These bits are provided for compatibility with some software that expects to read or write these
bits;
index 00 bits 1, 0 Sequencer Reset bits - setting either or both of these bits to 1 will stop (i.e.
reset) the Sequencer. Because stopping the Sequencer halts all interface signals to the LCD
panel, logic exists to shut down the panel power (LCDPWR# goes high) before the Sequencer is
actually shut down. During this delay between reset request (i.e. setting the reset bits) and
actual Sequencer halting, any in-progress memory accesses will be completed. Also, during the
actual period that the Sequencer is held in a reset state, if a memory access request is issued by
the system, it will be held pending the restart of the Sequencer (while the memory cycle is held
pending, the RDY output is held low);
index 01 bit 0 - 8/9 Dot Select Bit, this bit only has an effect for CRT modes. If LCD Only mode is
selected (AUX[0B] bits 1:0 = 0,1), then this bit is a read/write only bit with no effect in hardware.
S-MOS Systems, Inc. • Tel: [phone] • Fax: [phone] • http://www.smos.com
3C5h RW
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
Screen Off
n/a
Map A Select
Bit 2
n/a
n/a
n/a
Dummy
Shift by 4
(see note)
n/a
Map B Select
Bit 2
n/a
X12-SP-001-07
n/a
n/a
Dotclock
Divide by 2
Plane 3
Write Enable
Map A Select
Bit 1
Chain 4
Sequencer
Index Bit 2
n/a
Dummy
Shift Load
(see note)
Plane 2
Write Enable
Map A Select
Bit 0
Odd/Even
Map Select
Sequencer
Index Bit 1
Sequencer
Reset
Dummy
Bandwidth
(see note)
Plane 1
Write Enable
Map B Select
Bit 1
256KB
DRAM
RO Status
Read 1
Sequencer
Index Bit 0
Sequencer
Reset
8/9 Dot
Select
Plane 0
Write Enable
Map B Select
Bit 0
n/a
411-1.0
SPC8106