RTE-V831-PC
USER’S MANUAL (Rev. 2.00)
26
10.3.
NOTES ON USING THE EXT BUS
When extending hardware on the EXT bus, note the following points.
(1)
Memory and I/O space mapping
The EXT bus space is mapped onto the CS4 space of the V831. For access, select memory or I/O
space with the bus controller (BCTC) built into the CPU.
(2)
A0 and BHE- signal handling
The A0 and BHE- signals are used on the EXT bus. They are determined by access and port
output from the V831. Before access, perform setting as explained in Section 8.5.
