SC2200 Datasheet, PDF (238/433 Pages) National Semiconductor (TI) – Thin Client On a Chip

Core Logic Module (Continued)
Table 5-31. F0BAR1+I/O Offset: LPC Interface Configuration Registers (Continued)
Bit Description
Offset 08h-0Bh
SERIRQ_CNT — Serial IRQ Control Register (R/W)
Reset Value: 00000000h
31:8
7
6
5:2
1:0
Reserved.
Serial IRQ Enable.
0: Disable.
1: Enable.
Serial IRQ Interface Mode.
0: Continuous.
1: Quiet.
Number of IRQ Data Frames.
0000: 17 frames
0001: 18 frames
0010: 19 frames
0011: 20 frames
0100: 21 frames
0101: 22 frames
0110: 23 frames
0111: 24 frames
Start Frame Pulse Width.
00: 4 Clocks
01: 6 Clocks
10: 8 Clocks
11: Reserved
1000: 25 frames
1001: 26 frames
1010: 27 frames
1011: 28 frames
1100: 29 frames
1101: 30 frames
1110: 31 frames
1111: 32 frames
Offset 0Ch-0Fh
DRQ_SRC — DRQ Source Register (R/W)
DRQx are internal signals between the Core Logic and SuperI/O modules.
Reset Value: 00000000h
31:8
7
6
5
4
3
2
1
0
Reserved.
DRQ7 Source. Selects the interface source of the DRQ7 signal.
0: ISA - DRQ7 (Unavailable externally.)
1: LPC - LDRQ# (Program PMR[14] = 1 and PMR[22] = 1 or LPC_ROM strap = 1 to enable LDRQ# function on ball.)
DRQ6 Source. Selects the interface source of the DRQ6 signal.
0: ISA - DRQ6 (Unavailable externally.)
1: LPC - LDRQ# (Program PMR[14] = 1 and PMR[22] = 1 or LPC_ROM strap = 1 to enable LDRQ# function on ball.)
DRQ5 Source. Selects the interface source of the DRQ5 signal.
0: ISA - DRQ5 (Unavailable externally.)
1: LPC - LDRQ# (Program PMR[14] = 1 and PMR[22] = 1 or LPC_ROM strap = 1 to enable LDRQ# function on ball.)
LPC BM0 Cycles. Allow LPC Bus Master 0 Cycles.
0: Enable.
1: Disable.
DRQ3 Source. Selects the interface source of the DRQ3 signal.
0: ISA - DRQ3 (Unavailable externally.)
1: LPC - LDRQ# (Program PMR[14] = 1 and PMR[22] = 1 or LPC_ROM strap = 1 to enable LDRQ# function on ball.)
DRQ2 Source. Selects the interface source of the DRQ2 signal.
0: ISA - DRQ2 (Unavailable externally.)
1: LPC - LDRQ# (Program PMR[14] = 1 and PMR[22] = 1 or LPC_ROM strap = 1 to enable LDRQ# function on ball.)
DRQ1 Source. Selects the interface source of the DRQ1 signal.
0: ISA - DRQ1 (Unavailable externally.)
1: LPC - LDRQ# (Program PMR[14] = 1 and PMR[22] = 1 or LPC_ROM strap = 1 to enable LDRQ# function on ball.)
DRQ0 Source. Selects the interface source of the DRQ0 signal.
0: ISA - DRQ0 (Unavailable externally.)
1: LPC - LDRQ# (Program PMR[14] = 1 and PMR[22] = 1 or LPC_ROM strap = 1 to enable LDRQ# function on ball.)
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