参数资料
型号: SIS600
厂商: SILICON INTEGRATED SYSTEMS CORP
元件分类: 外设及接口
英文描述: MULTIFUNCTION PERIPHERAL, PBGA487
封装: BGA-487
文件页数: 75/144页
文件大小: 1592K
代理商: SIS600
SiS600 Pentium II PCI /A.G.P. Chipset
Preliminary V1.0 Jan. 25, 1999
33
Silicon Integrated Systems Corporation
START
N=0
BANK[N].mode
= FP
DRAM
exist?
BANK[N].mode
= EDO
DRAM
exist?
BANK[N].mode
= EDO
BANK[N].mode
= FP
BANK[N].mode
= SDRAM
Initialize SDRAM
DRAM
exist?
BANK[N].mode
= SDRAM
BANK[N] no DRAM
Decide
BANK[N].type
N = N + 1
N < 3
DONE
Y
N
Y
N
Y
Figure 5.2-4 DRAM Detection Sequence
5.2.4.
ARBITER
The arbiter is the interface between the DRAM controller and the host interface which can access DRAMs. In
addition to passing or translating the information from outside to DRAM controller, arbiter is also responsible for
which master has higher priority to access DRAMs. The arbiter treats different DRAM access request as DRAM
master, and that makes there be 6 masters which are trying to access DRAMs by sending their request to the
arbiter. After one of them gets the grant from the arbiter, it owns DRAM bus and begins to do memory data
transaction. The masters are: Refresh high request, AGP high access request, CPU read request, CPU write
request, AGP low access request, Refresh low request. The order of these masters shown above also stands for
their priority to access memory.
5.2.5.
REFRESH CYCLE
The refresh cycle will occur every 15.6us. It is timed by a counter of 14Mhz input. The CAS[7:0]# will be
asserted at the same time, and the RAS[5:0]# are asserted sequentially.
5.2.6. GRAPHIC WINDOW RE-MAPPING
For supporting the A.G.P. bus, SiS600 supports an address range, Graphic Window (GW), which is
virtual, contiguous, programmable range and can be re-mapped by Graphic Address Re-mapping
Table (GART) to non-contiguous pages of the system memory. Graphic Window is defined by
Graphic Window Base Address (GWBA) configuration register. The size of Graphic Window is
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