Computer Hardware User Manual

x Intel® 460GX Chipset System Software Developer’s Manual
15 PCI/LPC Bridge Description..........................................................................................15-1
15.1 PCI Interface ....................................................................................................15-1
15.1.1 Transaction Termination .....................................................................15-1
15.1.2 Parity Support .....................................................................................15-1
15.1.3 PCI Arbitration.....................................................................................15-1
15.2 Interrupt Controller ...........................................................................................15-1
15.2.1 Programming the Interrupt Controller..................................................15-2
15.2.2 End of Interrupt Operation...................................................................15-3
15.2.3 Modes of Operation.............................................................................15-4
15.2.4 Cascade Mode ....................................................................................15-5
15.2.5 Edge and Level Triggered Mode.........................................................15-6
15.2.6 Interrupt Masks ...................................................................................15-6
15.2.7 Reading the Interrupt Controller Status...............................................15-7
15.2.8 Interrupt Steering ................................................................................15-7
15.3 Serial Interrupts................................................................................................15-8
15.3.1 Protocol...............................................................................................15-8
15.4 Timer/Counters ..............................................................................................15-10
15.4.1 Programming the Interval Timer........................................................15-10
15.5 Real Time Clock.............................................................................................15-13
15.5.1 RTC Registers and RAM...................................................................15-14
15.5.2 RTC Update Cycle ............................................................................15-17
15.5.3 RTC Interrupts...................................................................................15-17
15.5.4 Lockable RAM Ranges .....................................................................15-17
16 IFB Power Management ...............................................................................................16-1
16.1 Overview ..........................................................................................................16-1
16.2 IFB Power Planes ............................................................................................16-2
16.2.1 Power Plane Descriptions ...................................................................16-2
16.2.2 SMI# Generation .................................................................................16-2
16.2.3 SCI Generation ...................................................................................16-3
16.2.4 Sleep States........................................................................................16-3
16.2.5 ACPI Bits Not Implemented by IFB.....................................................16-4
16.2.6 Entry/Exit for the S4 and S5 States.....................................................16-4
16.3 Handling of Power Failures in IFB....................................................................16-5
Figures
1-1 Diagram of a Typical Intel® 460GX Chipset-based System with AGP ..............1-1
4-1 System Memory Address Space........................................................................4-2
4-2 Itanium™ Processor and Chipset-specific Memory Space ................................4-5
4-3 System I/O Address Space................................................................................4-6
4-4 System Memory Address Space as Viewed from an Expander
Bridge (PXB/GXB)..............................................................................................4-7
5-1 Maximum Memory Configuration Using Two Cards...........................................5-2
5-2 Address Interleaving ..........................................................................................5-4
6-1 SAC Error Flow on Data...................................................................................6-14
6-2 SDC Error Data Flow .......................................................................................6-15
6-3 GXB Error Flow................................................................................................6-25
7-1 GART Table Usage for 4k Pages.......................................................................7-2
7-2 GART Table Usage for 4 MB Pages ..................................................................7-2
7-3 GART Entry Format for 4kB Pages....................................................................7-3