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參數(shù)資料
| 型號： | 21326 |
| 英文描述： | Implementation of Write Allocate Application Note |
| 中文描述： | 在寫分配應用執(zhí)行情況的說明 |
| 文件頁數(shù)： | 20/22頁 |
| 文件大小： | 241K |
| 代理商： | 21326 |
12
Programming Details
Implementation of Write Allocate in the K86 Processors
21326F/0—February 1999
Figures 3 and 4 show the bit positions for these two new
registers.
Figure 3.
Write Allocate Top-of-Memory and Control Register (WATMCR)—MSR 85h
Figure 4. Write Allocate Programmable Memory Range Register (WAPMRR)—MSR 86h
Step 3: AMD-K5
Processor
All of the write allocate features in the AMD-K5 processor are
enabled by setting bit 4 (WA) of the HWCR (MSR 83h) to 1. For
more information on the HWCR, see “Hardware Configuration
Register” in the
AMD-K5 Processor Software Development
Guide
, order# 20007. Figure 5 shows the definition of HWCR.
The BIOS programmer has several options regarding what the
end-user can control. The BIOS can provide the end-user with a
setup screen option to enable write allocate. The BIOS can
provide the end-user with a setup screen option to also setup
the other features (programmable ranges and fixed range). The
BIOS can automatically enable and setup the write allocate
Symbol
TME
PRE
FRE
Description
Top-of-Memory Enable
Programmable Range Enable
Fixed Range Enable
Bits
18
17
16
18 17 16 15
0
63
Reserved
F
R
E
P
R
E
T
M
E
Top of Memory—zzzz
19
16
31
32
15
0
63
Reserved
Programmable Range—xxxx
(Low - xxxx_0000h)
Programmable Range—yyyy
(High - yyyy_FFFFh)
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