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: 20/144页
文件大小: 1592K
代理商: SIS600
SiS600 Pentium II PCI A.G.P. Chipset
Preliminary V1.0 Jan. 25, 1999
113
Silicon Integrated Systems Corporation
Register 1Dh
I/O Limit
Default Value:
00h
Access:
Read/Write, Read Only
The I/O Limit register defines the top address of an address range that is used SiS600 to determine when to
forward I/O transactions from CPU to A.G.P.
BIT
ACCESS
DESCRIPTION
7:4
R/W
I/O Address Limit A[15:12]
Bits[7:4] controls the CPU to A.G.P. bus I/O access. SiS600 forward I/O cycle
initiated by CPU to A.G.P. bus if the address of the cycle meets the following
requirement.
IO_BASE
≤ address ≤ IO_LIMIT
3:0
RO
Reserved
Register 1Eh
Secondary PCI-PCI Status (SSTS)
Default Value:
0000h
Access:
Read/Write, Read Only
The Secondary Status register is similar in function and bit definition to the Status register of device 0 function 0
of SiS600.
BIT
ACCESS
DESCRIPTION
15
RO
Reserved
14
WC
Receiver System Error.
This bit is set when ASERR# assertion is detected on A.G.P. bus. This bit can be
cleared by writing a 1 to it.
13
WC
Receiver Master Abort
When 600 terminates a cycle on A.G.P. bus with master abort. This bit is set to 1.
This bit can be cleared by writing a 1 to it.
12
WC
Receiver Target Abort
When a 600 initiated cycle on A.G.P. is terminated with a target abort. This bit is
set to 1. This bit can be cleared by writing a 1 to it.
11:0
RO
Reserved
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