參數(shù)資料
型號(hào)： SLC88B17QFP
廠商： STANDARD MICROSYSTEMS CORP
元件分類： 總線控制器
英文描述： ISA BUS CONTROLLER, PQFP160
封裝： QFP-160
文件頁(yè)數(shù)： 10/54頁(yè)
文件大?。?/td> 333K
代理商： SLC88B17QFP
SMSC DS – SLC88B17
Page 18
Rev. 09/28/99
TOM
Top of Memory Register
Offset Address:
43h
Default Value:
0Eh
Access:
Read/Write
This register controls the forwarding of DMA or ISA master memory cycles to the PCI bus and sets the top of main
memory accessible by ISA or DMA devices. In addition, this register controls the forwarding of ISA or DMA accesses
to the lower BIOS range (E0000h-EFFFFh) and the 512-640Kbyte main memory region.
BIT
FUNCTION
7-4
Top of Memory Accessible by the ISA Master/DMA devices. The top of memory can be
assigned in 1Mbyte increments from 1-16 Mbytes. ISA or DMA accesses within this range, and
not in the memory hole region, are forwarded to PCI.
0000:
1 Mbytes
0001:
2 Mbytes
0010:
3 Mbytes
0011: 4 Mbytes
0100:
5 Mbytes
0101:
6 Mbytes
0110:
7 Mbytes
0111: 8 Mbytes
1000:
9 Mbytes
1001:
10 Mbytes
1010:
11 Mbytes
1011: 12 Mbytes
1100:
13 Mbytes
1101:
14 Mbytes
1110:
15 Mbytes
1111: 16 Mbytes
Note: If a 1Mbyte memory hole is created for the Host-to-PCI bridge chip between 15 and 16
Mbytes, this register should be set to 15 Mbytes.
3
ISA/DMA E0000-EFFFFh Memory Region Forwarding (to PCI) Enable.
If this bit is a 1, ISA/DMA cycles which access lower BIOS region are forwarded to PCI.
If this bit is a 0, no forwarded (always contained to ISA).
2
ISA/DMA 640-768K, A0000-BFFFFh, Memory Region Forwarding Enable.
1: Enable, ISA/DMA cycles which access 640-768K memory region are forwarded to PCI.
0: Disable (contained to ISA).
1
ISA/DMA 512K-640K Memory Region Forwarding Enable.
1: Enable, ISA/DMA cycles which access 512-640K memory region are forwarded to PCI.
0: Disable (contained to ISA).
0
Reserved.
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