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| 型號(hào)： | 21326 |
| 英文描述： | Implementation of Write Allocate Application Note |
| 中文描述： | 在寫分配應(yīng)用執(zhí)行情況的說明 |
| 文件頁數(shù)： | 12/22頁 |
| 文件大?。?/td> | 241K |
| 代理商： | 21326 |
4
Programming Details
Implementation of Write Allocate in the K86 Processors
21326F/0—February 1999
mechanisms only after performing any memory sizing or typing
algorithms.
Write Handling
Control Register
(WHCR)
The WHCR c
ontains three fields—the WCDE bit, the Write
Allocate Enable Limit (WAELIM) field, and the Write Allocate
Enable 15-to-16-Mbyte (WAE15M) bit (See Figure 1).
Figure 1. 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.
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).
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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