GENERAL FEATURES
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The memory refresh logic is redesigned to improve the system
performance and power consumption. In the original PC/AT design, the
memory refresh operation will suspend the CPU operation because it has
to access the main memory. In a high speed system like HIPPO COM,
the CPU indeed can process a large amount of operations in the memory
refresh period.
By implementing hidden refresh method, the refresh operations
for expansion card on the AT bus and for the main memory are separated.
To be compatible, the refresh operation for AT bus will not be changed.
But the refresh operation for main memory will be carried out
individually and will be done when there is no access to main memory.
Furthermore, the frequency of the main memory refresh operation may be
set to 'normal' or 'slow'. All types of DRAM can be used in `normal'
mode. When 'slow' mode is selected, the availability of main memory is
increased but the refresh period of DRAM should be longer. Since the
refresh period of DRAM from different manufacturers may vary, consult
your dealer for detail.
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