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: 110/144页
文件大小: 1592K
代理商: SIS600
SiS600 Pentium II PCI /A.G.P. Chipset
Preliminary V1.0 Jan. 25, 1999
65
Silicon Integrated Systems Corporation
Register 34h
Capability Pointer (CAPPTR)
Default Value:
C0h
Access:
Read Only
The value of C0h indicates that the A.G.P. standard register block is located at Register C0h.
BIT
ACCESS
DESCRIPTION
7:0
RO
Capability Pointer
Pointer to the starting location of A.G.P. standard register block.
8.1.2. HOST CONTROL REGISTERS
Register 50h
Host Bus Interface control I
default Value:
02h
Access:
Read/Write
BIT
ACCESS
DESCRIPTION
7:4
R/W
Reserved
3
R/W
CPU-to-Memory and PCI-to-Memory Concurrency Enable
When enabled, CPU-to-Memory cycles and PCI-to-Memory cycles can take place
concurrently on the host bus and PCI bus. These two kinds of memory access
cycles will then be rearranged on the host bus and take place on the memory bus
sequentially. Bus utilization on both the host bus and PCI bus can be improved.
When disabled, the two kinds of cycles can not occur on CPU or PCI concurrently.
0: Disable
1: Enable
2
R/W
CPU-to-PCI and PCI-to Masters Concurrently Access PCI Bus Function
When enabled, CPU-to-PCI cycles and PCI-to-Memory can take place concurrently
on the host bus and PCI bus respectively, such that their respective cycles will be
forwarded to PCI bus and memory bus at the same time. This bit is valid only when
bit 3 is set. When disabled, the two kinds of cycles can not occur on the host bus
and PCI bus concurrently.
0: Disable
1: Enable
1
R/W
CPU Pipeline Function
When this bit is 0, only one pending cycle is allowed at one time. When this bit is
1, more than two pending cycles at one time are allowed subject to CPU’s
behavior.
0: no pipeline
1: pipeline enable
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