參數(shù)資料
型號(hào): Alpha 21164
廠商: SAMSUNG SEMICONDUCTOR CO. LTD.
英文描述: Alpha Microprocessor(64位微處理器)
中文描述: 阿爾法微處理器(64位微處理器)
文件頁數(shù): 41/115頁
文件大?。?/td> 846K
代理商: ALPHA 21164
21164 Microprocessor Functional Overview
41
System Interface
System logic must help the 21164 to keep the Bcache coherent with main mem-
ory and other caches in the system.
The Icache is not a subset of any cache and also is not kept coherent with the
memory system.
Table 4 describes the Bcache states that determine cache coherence protocol for
21164 systems.
5.3 System Interface
The system interface is made up of bidirectional address and command buses, a data
bus that it shares with the Bcache interface, and several control signals.
Figure 10 shows the 21164 system interface signals.
1
The
tag_valid_h
,
tag_shared_h
, and
tag_dirty_h
signals are described in Table 2.
Table 4 Bcache States for Cache Coherency Protocols
Valid
1
Shared
1
Dirty
1
State of Cache Line
0
X
X
Not valid.
1
0
0
Valid for read or write operations. This cache line contains
the only cached copy of the block and the copy in memory is
identical to this line.
1
0
1
Valid for read or write operations. This cache line contains
the only cached copy of the block. The contents of the block
have been modified more recently than the copy in memory.
1
1
0
Valid for read or write operations. This block may be in
another CPU’s cache.
1
1
1
Valid for read or write operations. This block may be in
another CPU’s cache. The contents of the block have been
modified more recently than the copy in memory.
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