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): 126/159頁
文件大小: 1900K
代理商: AMD-640
Configuration Registers
7-29
21090C/0—June 1997
AMD-640 System Controller Data Sheet
Preliminary Information
Bit 7
Bank Decoding Test (RW)
0=Normal operation (default)
1=For production test only. DO NOT SET.
MA[1:0] Drive (RW)
0=12 mA (default)
1=24 mA
MA[1:0]/RAS[5:4]# (RW)
—This pin determines whether pins N17 and M17
function as RAS[5:4]# or secondary drivers for MA[1:0] as shown in Table
7-10.
Bit 6
Bit 5
Bit 4
Force SMM Mode (RW)
—When this bit is set the AMD-640 system controller
responds as if the SMIACT# pin was asserted.
0=SMM mode not forced (default)
1=SMM mode forced.
SDRAM command Drive (SRAS#, SCAS#, WEx#) (RW)
0=12 mA (default)
1=24 mA
MA[13:2] and WEx# Drive (RW)
0=12 mA (default)
1=24 mA
CAS# Drive (RW)
0=12 mA (default)
1=24 mA
RAS# Drive (RW)
0=12 mA (default)
1=24 mA
Bit 3
Bit 2
Bit 1
Bit 0
7.5.15
DRAM Drive Strength Control Register
(Offset 6Dh)
Bit 7
BDT
0
6
5
4
3
2
1
Bit 0
MA[1:0] Drive
0
MA/RAS#
0
FORCE SMM
0
SDRAMCD
0
MA&WED
0
CAS# Drive
0
RAS# Drive
0
Reset
Table 7-10.
Functions of Pins N17 and M17
Bit 5
Pin N17
Function
RAS5#
MA1
Pin M17
Function
RAS4#
MA0
Drive Control
0
1
Reg. 6Dh, bit 0
Reg. 6Dh, bit 6
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