參數(shù)資料
型號: AMD-640
廠商: Advanced Micro Devices, Inc.
英文描述: 64-Bit Socket 7 Interface, Integrated Write back Cache Controller, System Memory Controller, and PCI Bus Controller.(64位系統(tǒng)控制器(包括高速緩沖存儲器控制器,系統(tǒng)存儲器控制器和PCI總線控制器))
中文描述: 64位Socket 7的接口,集成寫回高速緩沖存儲器控制器,系統(tǒng)內(nèi)存控制器和PCI總線控制器。(64位系統(tǒng)控制器(包括高速緩沖存儲器控制器,系統(tǒng)存儲器控制器和的PCI總線控制器))
文件頁數(shù): 83/159頁
文件大?。?/td> 1900K
代理商: AMD-640
5-44
Functional Operation
AMD-640 System Controller Data Sheet
21090C/0—June 1997
Preliminary Information
PCI Bus Initiator
Read:
L1 Miss, Unmodified
L2 Hit
Figure 5-26 shows a PCI initiator read. L1 and L2 are snooped.
L1 misses but L2 hits. There is no write to DRAM because the
line is not modified. The L2 cache data is forwarded to the PCI
bus. Note that the entire cache line is read, and if a successive
PCI read addresses this data, it will be supplied directly from
the AMD-640 system controller.
Figure 5-26. PCI Bus Initiator Read: L1 Miss, Unmodified L2 Hit
Snoop L1
L2 enabled
A
C
B
D
Snoop L2 Hit Not Modified
A
Note read ahead
MRD
Addr
BE[3:0]#
HCLK
W/R#
ADS#
EADS#
BRDY#
HA[31:3]
BE[7:0]#
HITM#
AHOLD
BOFF#
CADV#
CADS#
COE#
CE1#
TAGWE#
TA[9:0]
HD[63:0]
PCLK
FRAME#
DEVSEL#
AD[31:0]
C/BE[3:0]#
IRDY#
TRDY#
REQ#
GNT#
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