Io Extension Of Limited Isa Bus; Address Decoding; Pull-Up Of Sd/Sa[7:0] - Epson SCE8720C Series Hardware Manual

CARD-PCI/GX Hardware Manual
A.2 IO extension of LIMITED ISA bus
A.2.1 Address decoding
The IO addresses that can be used outside SCE8720C are the ones not used by the
system, within the range from 100h to 3FFh. (refer to the IO map in the section 1.6.)
When decoding, the conditions SA0-9 and AEN=0 must be set to input.
A.2.2 Pull-up of SD/SA[7:0]
Pull-up SD/SA[7:0] by a resistance of 4.7kΩ or so. Otherwise, the software cannot
detect empty space in the memory area.
70
EPSON
Rev.A