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Intel® 460GX Chipset Software Developer’s Manual 11-11
LPC/FWH Interface Configuration
11.1.24 LPC FDD/LPT Decode Ranges (Function 0)
Address: E1h
Default Value: 00h
Attributes: Read/Write
3 Reserved.
2:0 Decode Range: The following table describes which range to decode for the COMA Port
Bits Decode Range
000 3F8 - 3FF (COM 1)
001 2F8 - 2FF (COM 2)
010 220 - 227
011 228 - 22F
100 238 - 23F
101 2E8 - 2EF (COM 4)
110 338 - 33F
111 3E8 - 3EF (COM 3)
Bit Description
Bit Description
7:5 Reserved.
4 Decode Range: The following table describes which range to decode for the FDD Port
Bits Decode Range
0 3F0 - 3F5, 3F7 (Primary)
1 370 - 375, 377 (Secondary)
3:2 Reserved.
1:0 Decode Range: The following table describes which range to decode for the LPT Port
Bits Decode Range
00 378 - 37F, 778-77F
01 278 - 27F (port 279 is read only), 678-
67F
10 3BC - 3BE, 7BC-7BE
11 Reserved.