TYAN S3970, Manual

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70
Feature Option Description
NorthBridge Chipset Configuration
Min Active RAS (Tras) Read only
This setting allows you to select the
number of clock cycles allotted for the
RAS pulse width, according to DRAM
specifications. The less the clock
cycles, the faster the DRAM
performance.
Row Precharge Time
(Trp) Read only
This item controls the number of cycles
for Row Address Strobe (RAS) to be
allowed to precharge. If insufficient
time is allowed for the RAS to
accumulate its chage before DRAM
refresh, refresh may be incomplete and
DRAM may fail to retain data. This
item applies only when synchronous
DRAM is installed in the system.
RAS/RAS Delay (Trrd)
Read only
Auto uses hardware compensation
values. Other values add to or subtract
from hardware generated value.
Recommended setting is Auto.
Row Cycle (Trc)
Read only
Bits 7-4. RAS#-active to RAS#-active
or auto refresh of the same bank.
Asynchronous Latency
Read only
Bits 3-0. This filed should be loaded
with a 4-bit value equal to the
maximum asynchronous latency in the
DRAM read round-trip loop.