Page 10
Epson Research and Development
Vancouver Design Center
S1D13503
ISA Bus Interface Considerations
X18A-G-003-05
Issue Date: 01/01/30
3.1 S1D13503 Default Setup
3.1.1 Configuration Options
The S1D13503 latches the state of the SRAM data bus during RESET to determine the power-on configuration. The chip
has internal pull-down resistors and therefore external pull-ups are only necessary when requiring a ’1’ state, see below.
1.
VD15 - VD13 = 101
memory decoding for locations $A segment
2.
VD12 - VD4 = 110000000
I/O decoding for locations 1100000000b - 1100000001b
3.
VD3 = 0
No byte swap of high and low bytes
4.
VD2 = 0
ISA Bus interface, i.e. non- MC68K interface
5.
VD1 = 0
Indexed I/O
6.
VD0 = 0
8-bit bus interface
Where 1 = pull-up with a 10K resistor; 0 = no pull-up resistor
3.1.2 Register Setting
All register settings are completely programmable and are dependent on display type, resolution, color and mode of
operation, see Functional Specification for details.
electronic components distributor