cs5535 National Semiconductor Corporation, cs5535 Datasheet - Page 420

• Manufacturer Part Number: cs5535
• Description: Geode Cs5535 Companion Multi-function South Bridge
• Manufacturer: National Semiconductor Corporation

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LPC Port Register Descriptions
5.14.1.3
MSR Address
Type
Reset Value
5.14.1.4
MSR Address
Type
Reset Value
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10
31:16
15:8
31:0
Bit
5:2
1:0
Bit
7
6
LPC Serial IRQ Control (LPC_SIRQ)
LPC Reserved (LPC_RSVD)
Name
INVERT[15:0]
RSVD
SIRQ_EN
SIRQ_MODE
IRQ_FRAME
START_FPW
Name
RSVD
5140004Eh
R/W
00000000h
5140004Fh
R/W
00000000h
INVERT[15:0]
Description
Invert bits 15 through 0. Each invert[x] bit corresponds to an irq[x] bit. When a given x
bit is 1, the corresponding serial IRQ input is assumed active low. Active low inputs are
inverted and presented internally as active high inputs.
Reserved. Write as 0.
Serial IRQ Enable. 0: Disable; 1: Enable
Serial IRQ Interface Mode. 0: Continuous (Idle); 1: Quiet (Active)
IRQ Data Frames. Number of frames.
0000: 17.
0001: 18.
0010: 19.
0011: 20.
Start Frame Pulse Width. Sets the start frame pulse width, specified by the number of
clocks.
00: 4 clocks.
01: 6 clocks.
Description
Reserved. Reads return 0. Writes have no effect.
LPC_RSVD Bit Descriptions
LPC_SIRQ Bit Descriptions
(Continued)
LPC_RSVD Register Map
LPC_SIRQ Register Map
0100: 21.
0101: 22.
0110: 23.
0111: 24.
RSVD
420
1000: 25.
1001: 26 .
1010: 27.
1011: 28.
10: 8 clocks.
11: Reserved.
RSVD
9
9
1100: 29.
1101: 30.
1110: 31.
1111: 32.
8
8
7
7
6
6
5
5
IRQ_FRAME
4
4
3
3
2
2
Revision 0.8
START
_FPW
1
1
0
0