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): 118/159頁
文件大?。?/td> 1900K
代理商: AMD-640
Configuration Registers
7-21
21090C/0—June 1997
AMD-640 System Controller Data Sheet
Preliminary Information
Bits 7–6
Bits 5–4
Bits 3–2
Bits 1–0
Shadow RAM Control for Addresses CC000–CFFFFh (RW)
Shadow RAM Control for Addresses C8000–CBFFFh (RW)
Shadow RAM Control for Addresses C4000–C7FFFh (RW)
Shadow RAM Control for Addresses C0000–C3FFFh (RW)
Bits 7–6
Bits 5–4
Bits 3–2
Bits 1–0
Shadow RAM Control for Addresses DC000–DCFFFFh (RW)
Shadow RAM Control for Addresses D8000–DBFFFh (RW)
Shadow RAM Control for Addresses D4000–D7FFFh (RW)
Shadow RAM Control for Addresses D0000–D3FFFh (RW)
Each pair of bits controls the accessibility of its corresponding address
range as follows:
00 = Shadowing (read and write) disabled (default)
01 = Write enabled
10 = Read enabled
11 = Read and write enabled
Shadow Control Registers
(Offsets 61h–63h)
A memory read/write is considered shadowed when the accessed memory segment(s)
in lower memory are intercepted by the AMD-640 system controller and redirected to
data copies in the upper memory area. Each 16-Kbyte segment in the UMA (64-
Kbyte segments in addresses E0000h–FFFFFh) can be enabled for shadowing by
setting at least one of its corresponding two bits in offsets 61h–63h. Shadowing can
be enabled for read only, write only, or both.
7.5.5
Shadow RAM Control Register #1
(Offset 61h)
Bit 7
6
5
C8000–CBFFFh
0
4
3
2
1
Bit 0
CC000–CFFFFh
0
C4000–C7FFFh
0
C0000–C3FFFh
0
Reset
0
0
0
0
7.5.6
Shadow RAM Control Register #2
(Offset 62h)
Bit 7
DC000–DFFFFh
0
6
5
D8000–DBFFFh
0
4
3
D4000–D7FFFh
0
2
1
D0000–D3FFFh
0
Bit 0
Reset
0
0
0
0
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