參數(shù)資料
型號(hào): 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(chǔ)器控制器,系統(tǒng)存儲(chǔ)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(chǔ)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(chǔ)器控制器,系統(tǒng)存儲(chǔ)器控制器和的PCI總線控制器))
文件頁數(shù): 43/159頁
文件大?。?/td> 1900K
代理商: AMD-640
5-4
Functional Operation
AMD-640 System Controller Data Sheet
21090C/0—June 1997
Preliminary Information
Figure 5-2. Read Buffers
Memory reads that fill the processor’s caches are by far the
most common types of reads. These reads occur as a burst read
of four quadwords (32 bytes). When a burst read hits in the
controller’s read buffer, the transactions are identical to the
single qword read described above except that the BRDY#
signal is extended for three more clocks and, following the first
qword transfer, three more quadwords of data are output onto
the data bus at the rate of one quadword per clock. Thereafter,
subsequent blocks that access sequential locations are all
prefetch-queue hits because the memory controller fills the
read queue as an integral part of the read cycle.
The read buffers snoop write transactions to maintain data
coherency. If a write transaction occurs to an address whose
data is contained in one of the read buffers, that read buffer is
invalidated.
Read
Control
Logic
Processor
Address
Bus
Processor
Data
Bus
Memory
Data
Bus
Buffer 1
Address Tag
Buffer 2
Address Tag
Buffer 3
Address Tag
Buffer 4
Address Tag
Buffer 1 Data
8 bytes
Buffer 2 Data
8 bytes
Buffer 3 Data
8 bytes
Buffer 4 Data
8 bytes
Buffer 5 Data
8 bytes
Buffer 5
Address Tag
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