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參數(shù)資料
| 型號： | 21329 |
| 英文描述： | AMD-K6 Processor Power Supply Design Application Note AMD-K6 Processor Bios Design Application Note |
| 中文描述： | 的AMD - K6處理器電源設(shè)計應(yīng)用指南的AMD - K6處理器的BIOS設(shè)計中的應(yīng)用說明 |
| 文件頁數(shù)： | 28/52頁 |
| 文件大?。?/td> | 687K |
| 代理商： | 21329 |
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18
Model-Specific Registers (MSRs)
AMD-K6
Processor BIOS Design
21329L/0—December 1999
Figure 3. Write Handling Control Register (WHCR)—MSR C000_0082h (Models 6, 7, and 8/[7:0])
WCDE.
For proper functionality, always program bit 8 of WHCR
to 0. See “Pipelining Support” on page 42 for more information
on WCDE.
Write Allocate Enable Limit.
The WAELIM field is 7 bits wide. This
field, multiplied by 4 Mbytes, defines an upper memory limit.
Any pending write cycle that misses the L1 cache and that
addresses memory below this limit causes the processor to
perform a write allocate (assuming the address is not within a
range where write allocates are disallowed). Write allocate is
disabled for memory accesses at and above this limit unless
the processor determines a pending write cycle is cacheable by
means of one of the other write allocate mechanisms—“Write
to a Cacheable Page” and “Write to a Sector” (for more
information, see the “Cache Organization” chapter in the
AMD-K6
Processor Data Sheet
, order# 20695 or the
AMD-K6
-2
Processor Data Sheet
, order# 21850). The maximum value of this
limit is ((2
7
–1) · 4 Mbytes) = 508 Mbytes. When all the bits in
this field are set to 0, all memory is above this limit and the
write allocate mechanism is disabled (even if all bits in the
WAELIM field are set to 0, write allocates can still occur due
to the “Write to a Cacheable Page” and “Write to a Sector”
mechanisms).
Once the BIOS determines the amount of RAM installed in the
system, this number should also be used to program the
WAELIM field. For example, a system with 32 Mbytes of RAM
would program the WAELIM field with the value 0001000b.
This value (8), when multiplied by 4 Mbytes, yields 32 Mbytes
as the write allocate limit.
7
1
0
63
Reserved
WAELIM
8
0
Note
:
Hardware RESET initializes this MSR to all zeros.
W
A
E
1
5
M
Symbol
WCDE
WAELIM
WAE15M
Description
Always program to 0
Write Allocate Enable Limit
Write Allocate Enable 15-to-16-Mbyte 0
Bits
8
7–1
9
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