cs5535 National Semiconductor Corporation, cs5535 Datasheet - Page 338

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

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PIC Register Descriptions
5.9.1.7
MSR Address
Type
Reset Value
Note 1. To restore OCW2 to shadow register value, write the appropriate address twice. First with the shadow register val-
Bit
3:0
Bit
7:0
7
ue, then with the shadow register value ORed with C0h.
PIC Shadow (PIC_SHDW)
Name
IG8_STS
Name
PIT_SHDW (RO)
51400034h
RO
xxh
6
PIC_XIRR_STS_HIGH Bit Descriptions (Continued)
Description
Group 8 Interrupt Status. Reports the status of the four interrupts in this group.
bit 0: Primary Input 8.
bit 1: LPC Input 8.
bit 2: Unrestricted Y Input 8.
bit 3: Unrestricted Z Input8.
Description
PIC Shadow (Read Only). This 8-bit port sequences through the following list of shad-
owed Programmable Interrupt Controller registers. At power on, a pointer starts at the
first register in the list and consecutively reads incrementally through it. A write to this
register resets the read sequence to the first register. Each shadow register in the
sequence contains the last data written to that location.
The read sequence for this register is:
1.
2.
3.
4.
5.
6.
7.
8.
9.
10. PIC2 ICW4 - Bits [7:5] of ICW4 are always 0.
11. PIC2 OCW2 - Bits [6:3] of OCW2 are always 0 (Note 1).
12. PIC2 OCW3 - Bits [7, 4] are 0 and bit [6, 3] are 1.
5
(Continued)
PIC1 ICW1.
PIC1 ICW2.
PIC1 ICW3.
PIC1 ICW4 - Bits [7:5] of ICW4 are always 0.
PIC1 OCW2 - Bits [6:3] of OCW2 are always 0 (Note 1).
PIC1 OCW3 - Bits [7, 4] are 0 and bit [6, 3] are 1.
PIC2 ICW1.
PIC2 ICW2.
PIC2 ICW3.
PIC_SHDW Bit Descriptions
PIC_SHDW Register Map
4
PIC_SHDW
338
3
2
1
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