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CHAPTER 4
CHAPTER 4
CHAPTER 4
CHAPTER 4
CHAPTER 4
SDRAM CAS Latency
This option determines the CAS latency time parameter of SDRAM.
The settings are 2 clks or 3 clks.
SDRAM RAS Precharge Time
This option defines the RAS# precharge requirements for the
SDRAM memory type in 66MHz clocks.
VGA Frame Buffer USWC
The Pentium
Write-Combining (USWC) memory type. The processor provides a write-
combining with buffering strategy for write operation. This is useful for
frame buffering. Writing to USWC memory can be buffered and combined in
the processors write-combining buffer (WCB). The WCBs are viewed as a
special purpose outgoing write buffers, rather than a cache. The WCBs are
written into memory to allocate a different address, or after executing a
serializing, locked, or I/O instructions.
During Enabled, this will enable the processor memory location A000
and B000 segment as USWC memory type.
®
II processor supports the Uncacheable Speculatable
4-12
®
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BIOS USER'S GUIDE
BIOS USER'S GUIDE
BIOS USER'S GUIDE
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BIOS USER'S GUIDE
BIOS USER'S GUIDE
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