B&R Industries Provit 5000, User Manual

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290 Provit 5000 User’s Manual
Software • BIOS for System Unit with Socket 370
3.4 Chipset Features Setup
The parameters in this screen are for system designers, service personnel, and
technically competent users only. The best advice is to alter only those settings that
you thoroughly understand.
SDRAM Control by
SPD: The values SDRAM RAS-to-CAS delay, SDRAM RAS Precharge
Time and SDRAM CAS Latency Time are automatically set (BIOS
reads out the SDRAM parameter).
Manual: These values can be manually changes
SDRAM RAS-to-CAS Delay
When DRAM is refreshed, both rows and columns are addressed separately. This
setup item allows you to determine the timing of the transition from RAS to Column
Address Strobe (CAS).
SDRAM RAS Precharge Time
The precharge time is the number of cycles it takes for the RAS to accumulate its
charge before DRAM refresh. If insufficient time is allowed, refresh may be
incomplete and the DRAM may fail to retain data.
Figure 179: Chipset Features Setup