SPC8106 S-MOS Systems, SPC8106 Datasheet - Page 389

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

3.7
A 32K Flash EPROM contains the VGA BIOS and is reprogrammable on-board. The EPROM is
configured to respond to addresses in the range C0000h through C7FFFh. This board design and
associated programming software has been designed to work with AMDand Intel Flash EPROMs
only.
The evaluation board has circuitry to prevent accidental programming or erasure of the Flash
EPROM. When DIP switch SW2-6 is in the open position, writes to the Flash EPROM are inhib-
ited. When SW2-6 is in the closed positing, erasure and reprogramming is allowed.
Erasure and reprogramming of the Flash EPROM is implemented through device specific algo-
rithms.
3.8
The SPC8106 VCC Core voltage can be either 3.3 volts or 5.0 volts (as selected by MD8). To pro-
vide testing when 3.3 volts is selected, an independent adjustable 3.3 volt power supply,
PCBVDD1, has been provided on-board. This power supply is adjustable from 2.0 volts to 4.0
volts at 1 amp using R61.
To connect PCBVDD1 to VCC Core, install R57 and remove R65.
3.9
For the SPC8106, VCCI/O can be either 3.3 volts or 5.0 volts. However, the SDU8106B0E evalu-
ation board does not support 3.3 volt I/O operation and therefore the VCC I/O is restricted to 5.0
volts only. To provide full testing of VCC I/O at 5.0 volts, and for when VCC Core voltage is
selected to be 5.0 volts (selected by MD8), an independent adjustable 5.0 volt power supply
PCBVDD2 has been provided on board This power supply is adjustable from 4.0 volts to 6.0 volts
at 1amp using R63.
To connect PCBVDD2 to VCC Core, install R65 and remove R57. To connect PCBVDD2 to VCC
I/O, install R66 and remove R58.
3.10
The SPC8106, ATT20C497 and DRAM chips have1 ohm l% resistors in series with their VDD
pins for power consumption measurements.
SPC8106
411-1.0
Flash EPROM VGA BIOS Support
Adjustable 3.3 Volt Power Supply
Adjustable 5.0 Volt Power Supply
Power Measurement Capability
S-MOS Systems, Inc. • Tel: [phone] • Fax: [phone] • http://www.smos.com
X12-AN-001-01
SDU8106B
0E
Rev. 1.0 Evaluation Board User Manual
EV1-13