Octek HAWK 486, Manual

Page: 87 / 97

SYSTEM BIOS
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A-33
(12) CHIPSET
This section provides a means to define some parameters for the
system, such as memory wait state and the AT-bus speed. The default
settings are proper for normal usage. Changing the setting may lead to
better performance, but make sure your system is still reliable and
compatible with the peripherals.
DRAM TIMING - READ/WRITE STATE
The number of wait state for read and write operation depends
on the clock speed of CPU and the speed rating of the DRAM. Improper
setting can make the system unstable. Since the specification of DRAM
for different manufacturers may vary, you would better consult your local
dealer for the detailed information. In general, select 0 wait state Write
and 1 wait state Read with 80ns DRAM for 33MHz system. For 25MHz
system, select 0 wait Read for using 80ns DRAM.
EXTRA WAIT STATE
The standard AT Bus, it requires 1ws for 16 bit and 8 bit bus
operation to 8 bit device, take 4 wait state, so cycle turn is achieved. For
the slower I/O device, it will require one more wait state to complete
cycle.