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): 23/159頁
文件大小: 1900K
代理商: AMD-640
2-6
Overview
AMD-640 System Controller Data Sheet
21090C/0—June 1997
Preliminary Information
2.3.1
Data
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Quantities—A word is two bytes (16 bits), a dword or
doubleword is four bytes (32 bits), and a qword or
quadword is eight bytes (64 bits).
Addressing—Memory is addressed as a series of bytes on
eight-byte (64-bit) boundaries, in which each byte can be
separately enabled.
Abbreviations—The following notation is used for bits and
bytes:
kilo
k........as in 4 kbytes/page
Mega
M......as in 4 Mbits/sec
Giga
G.......as in 4 Gbytes of memory space
Little-Endian Convention—The byte with the address
xx...xx00 is in the least-significant byte position (little end).
In byte diagrams, bit positions are numbered from right to
left: the little end is on the right and the big end is on the
left. Data structure diagrams in memory show small
addresses at the bottom and high addresses at the top.
When data items are aligned, bit notation on a 64-bit data
bus maps directly to bit notation in 64-bit-wide memory.
Because byte addresses increase from right to left, strings
appear in reverse order when illustrated.
Bit Ranges—In a range of bits, the highest and lowest bit
numbers are separated by a dash, as in 63–00.
Bit Values—Bits can either be set to 1 or cleared to 0.
Hexadecimal and Binary Numbers—Unless the context
makes interpretation clear, hexadecimal numbers are
followed by an h, binary numbers are followed by a b, and
decimal numbers are followed by a d.
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