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): 125/159頁
文件大?。?/td> 1900K
代理商: AMD-640
7-28
Configuration Registers
AMD-640 System Controller Data Sheet
21090C/0—June 1997
Preliminary Information
Bit 7
64 Mbit SDRAM Interleave (RW)
—This bit is relevant only for 64-Mbit SDRAM
with bit 5 set.
0=2-bank interleave (default)
1=4-bank interleave
SDRAM Burst Write (RW)
0=Disabled (default)
1=Enabled
SDRAM Bank Interleave Enable (RW)
—This feature increases performance by
reducing the number of clocks required.
0=Disabled (default). Timing for a 3-line burst is 8-1-1-1-3-1-1-1-3-1-1-1.
1=Enabled. Timing for a 3-line burst is 8-1-1-1-1-1-1-1-1-1-1-1.
Reserved (always reads 0)
SDRAM CAS# Latency (RW)
0=Cycle latency is 2 (default)
1=Cycle latency is 3
Note:
It is possible to program CAS latencies of 1, 2, or 3 into any SDRAM
bank regardless of the value set by bit 3. Programming a different CAS
latency value in memory than the value implemented by this register
can result in miscommunication.
SDRAM Operation Mode Select (RW)
—These commands are used in the
SDRAM detection algorithm. Refer to the BIOS porting guide.
000 = normal SDRAM mode (default)
001 = NOP command enabled
010 = CPU-to-DRAM cycles are converted to All Banks Precharge
commands
011 = CPU-to-DRAM cycles are converted to commands driven on
MA[11:0]. The BIOS selects an appropriate host address for each
memory row of memory to generate the appropriate commands.
100 = CAS#-Before-RAS# cycle enable
101 to 111 = Reserved
Bit 6
Bit 5
Bit 4
Bit 3
Bits 2–0
7.5.14
SDRAM Control Register
(Offset 6Ch)
Bit 7
64MBSI
0
6
5
4
3
2
1
Bit 0
SBW
0
SBIE
0
Reserved
0
SCL
0
SOMS
0
Reset
0
0
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