User`s manual

A-2 Intellio CP-204J User’s Manual
PCI
The 32-bit Intellio CP-204J board complies with PCI Spec. 2.1. Hardware
configuration for IRQ and Memory addresses is automatically assigned by PCI
BIOS. Hence, it is a must to
have the board plugged first before installing software
driver.
Unlike ISA slots, different PCI slots in the same PC may have different bus numbers
and device numbers with respect to PCI specifications. The same PCI board will
have different system configurations if switched to a different PCI slot, which may
be called
slot-sensitive or slot-dependent. This may also apply to PCI slots in PC of
different mother board, which may use
different device number set. For example,
some use 17, 18, 19, and 20 for identifying the respective PCI slot but some use 11,
12, 13 and 14.
Due to the
slot-dependency, it is necessary to re-configure the software driver
once the board is plugged in different PCI slots.
At most 4 boards of
Intellio CP-204J are allowed in a system. When installing
multiple boards,
please do keep in mind the order you plug the boards for
distinguishing the boards installed.
Dual-Ported RAM
There is 512 KB of dual-ported DRAM on the Intellio CP-204J, which is used as a
data buffer and memory map device for the mother board. It is called “dual-ported”
because it is accessed by both mother board CPU and the
Intellio CP-204J on-board
CPU. Generally speaking, the memory access time is much faster than normal I/O
access.
All messages and data are transferred through this 512 KB dual-ported memory.
The buffer area appears as normal 16-bit memory to the PC AT I/O channel.
Every
Intellio CP-204J only occupies 16 KB of memory space (window) from the
system point of view.