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參數(shù)資料
| 型號： | AMD-K5 |
| 廠商： | Advanced Micro Devices, Inc. |
| 英文描述： | 32-Bit Superior Price/Performance Value Microprocessor(32位高性/價比微處理器) |
| 中文描述： | 32位卓越的價格/性能值微處理器（32位高性/價比微處理器） |
| 文件頁數(shù)： | 52/100頁 |
| 文件大?。?/td> | 2533K |
| 代理商： | AMD-K5 |
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42
AMD-K5 Processor Data Sheet
18522F/0—Jan1997
PRELIMINARY INFORMATION
Locked Operations
A locked cycle, illustrated in Figure 8, uses the LOCK pin to
indicate that the processor is performing a read-modify-write,
and that both the read operation and write operation must be
allowed to complete as a combined operation. (See Figure 36,
40, and 42 beginning on page 78.)
Figure 8. Locked Cycles
When the program generates a locked access, the processor
first looks in the data cache. If the locked object is modified in
the cache, it is written back to memory and invalidated. It is
then accessed using a locked memory cycle. Since combined
operations can access misaligned objects, locked operations
can result in multiple writebacks, multiple locked reads, and
multiple locked writes. When unaligned locked operations are
performed, SCYC is asserted
LOCK during HOLD
and BOFF
An assertion of HOLD after a locked operation has initiated is
ignored by the processor until after the entire locked opera-
tion has completed. Following completion, HLDA is asserted.
If BOFF is asserted during the read portion of a locked access,
LOCK will float and the entire locked access will be restarted
after BOFF is negated. If BOFF is asserted during the write
portion of a locked access, LOCK will float and only the write
will be restarted after BOFF is negated.
LOCK Operations
during Inquire Cycles
Inquire cycles can be performed as usual during locked opera-
tions. Inquire cycles during atomic locked read and write oper-
ations are only allowed from the external inquire. No
writebacks will be seen because the processor has already
evicted the modified line.
CLK
ADS
BRDY
W/R
LOCK
Data
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相關代理商/技術參數(shù) |
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|---|---|
| AMD-K5-PR100ABQ | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:32-Bit Microprocessor |
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| AMD-K5-PR133ABQ | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:32-Bit Microprocessor |
| AMD-K5-PR133ABR | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:32-Bit Microprocessor |
| AMD-K5-PR166ABX | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:32-Bit Microprocessor |
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