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238 AMD Geode™ SC2200 Processor Data Book
Core Logic Module - Bridge, GPIO, and LPC Registers - Function 0
32580B
2 SMI# Polarity. This bit allows signal polarity selection of the SMI# generated from LPC.
0: Active high.
1: Active low.
1 IRQ1 Polarity. If LPC is selected as the interface source for IRQ1 (F0BAR1+I/O Offset 00h[1] = 1), this bit allows signal
polarity selection.
0: Active high.
1: Active low.
0 IRQ0 Polarity. If LPC is selected as the interface source for IRQ0 (F0BAR1+I/O Offset 00h[0] = 1), this bit allows signal
polarity selection.
0: Active high.
1: Active low.
Offset 08h-0Bh SERIRQ_CNT — Serial IRQ Control Register (R/W) Reset Value: 00000000h
31:8 Reserved.
7 Serial IRQ Enable.
0: Disable.
1: Enable.
6 Serial IRQ Interface Mode.
0: Continuous.
1: Quiet.
5:2 Number of IRQ Data Frames.
0000: 17 frames 0100: 21 frames 1000: 25 frames 1100: 29 frames
0001: 18 frames 0101: 22 frames 1001: 26 frames 1101: 30 frames
0010: 19 frames 0110: 23 frames 1010: 27 frames 1110: 31 frames
0011: 20 frames 0111: 24 frames 1011: 28 frames 1111: 32 frames
1:0 Start Frame Pulse Width.
00: 4 Clocks
01: 6 Clocks
10: 8 Clocks
11: Reserved
Offset 0Ch-0Fh DRQ_SRC — DRQ Source Register (R/W) Reset Value: 00000000h
Note: DRQx are internal signals between the Core Logic and SuperI/O modules. Some signals require additional programming to
make them externally accessible. See Table 4-2 "Multiplexing, Interrupt Selection, and Base Address Registers" on page 76 for
pin multiplexing details and Table 3-4 "Strap Options" on page 45 for LPC_ROM strap information.
31:8 Reserved.
7 DRQ7 Source. Selects the interface source of the DRQ7 signal.
0: ISA - DRQ7 (unavailable externally).
1: LPC - LDRQ# (ball L28).
6 DRQ6 Source. Selects the interface source of the DRQ6 signal.
0: ISA - DRQ6 (unavailable externally).
1: LPC - LDRQ# (ball L28).
5 DRQ5 Source. Selects the interface source of the DRQ5 signal.
0: ISA - DRQ5 (unavailable externally).
1: LPC - LDRQ# (ball L28).
4 LPC BM0 Cycles. Allow LPC Bus Master 0 Cycles.
0: Enable.
1: Disable.
3 DRQ3 Source. Selects the interface source of the DRQ3 signal.
0: ISA - DRQ3 (unavailable externally).
1: LPC - LDRQ# (ball L28).
Table 6-31. F0BAR1+I/O Offset: LPC Interface Configuration Registers (Continued)
Bit Description