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參數(shù)資料
| 型號： | 23913A |
| 英文描述： | Embedded AMD-K6 Processors BIOS Design Guide Application Note? 1.33MB (PDF) |
| 中文描述： | 嵌入式的AMD - K6處理器的BIOS設(shè)計指南應(yīng)用筆記？ 1.33MB（PDF格式） |
| 文件頁數(shù)： | 32/98頁 |
| 文件大?。?/td> | 1365K |
| 代理商： | 23913A |
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20
Model 7 and Model 8/[7:0] Registers
Embedded AMD-K6 Processors BIOS Design Guide
23913A/0—November 2000
Preliminary Information
Figure 3. Write Handling Control Register (WHCR) (Models 7 and 8/[7:0])
Write Cacheability
Detection Enable Bit
For proper functionality, always program bit 8 of WHCR to 0.
See “Pipelining Support” on page 69 for more information on
the WCDE bit.
Write Allocate Enable
Limit Field
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 appropriate AMD-K6 or AMD-K6E processor
data sheet.
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.
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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