SPC8106 S-MOS Systems, SPC8106 Datasheet - Page 386

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

During SPC8106 Hardware Power Save Mode (and Power Save Mode 4), provision must be
made to refresh the video DRAM. As shown in the following table, there are four options. Option
one uses the frequency source connected to CLK1. Option two uses the ISA /REFRESH signal
(which is connected to SPC8106 pin MEMEN). Option three is for the case when the DRAM
supports self-refresh. Option four selects a 64 kHz signal connected to SPC8106 pin PDCLK.
(MD14 is not supported when using the SPC8108F0C.)
When SW2-6 is set to the open position, writes to the Flash EPROM will be disabled. When
SW2-6 is in the closed position, writes to the Flash EPROM are allowed. This is used to prevent
accidental writes to the Flash EPROM
The SPC8106 has the capability of enabling the video system through port address 3C3h or
through 46E8h and 102h. This capability is provided for when it is desired to have more than
one video system installed in a PC.
To select port address 3C3h, open the switch at MD15; to select 46E8h and 102h, close the
switch.
SDU8106B
EV1-10
MD11 - MD12 and MD14 Power Save Mode DRAM Refresh Source
SW2-6 Enable Writes to Flash EPROM
MD15 Video Enable Port Address
The BIOS supplied with the SDU8106B0E Evaluation Board will use 3C3h to enable the video
system. If it is desired to use 46E8h and 102h, a different BIOS will be required. (Not
supported when using the SPC8108F0C.)
S-MOS Systems, Inc. • Tel: [phone] • Fax: [phone] • http://www.smos.com
0E
0 = closed, 1 = open
MD1
Rev. 1.0 Evaluation Board User Manual
4
1
1
1
1
MD1
Table 0-4 SPC8106 Power Save Mode
2
0
0
1
1
DRAM Refresh Source Select
MD1
1
0
1
0
1
Option
1
2
3
5
CLK1
MEMEN (ISA /
REFRESH
Self Refresh DRAM
PDCLK (64 kHz)
Refresh Source
X12-AN-001-01
411-1.0
SPC8106