Intel SE7525GP2 - Manual (Page 65)

Intel® Server Board SE7320SP2 & Intel Server Board SE7525GP2 TPS Functional Architecture
Revision 2.0 65
Address (es) Resource Notes
03BCh – 03BFh Parallel Port 1 (Primary)
03C0h – 03CFh Video Display Controller
03D4h – 03Dah Color Graphics Controller
03E8h – 03Efh Serial Port A
03F0h – 03F5h Floppy Disk Controller
03F6h – 03F7h Primary IDE – Sec Floppy
03F8h – 03FFh Serial Port A (primary)
0400h – 043Fh DMA Controller 1, Extended Mode Registers
0461h Extended NMI / Reset Control
0480h – 048Fh DMA High Page Register
04C0h – 04CFh DMA Controller 2, High Base Register
04D0h – 04D1h Interrupt Controllers 1 and 2 Control Register
04D4h – 04D7h DMA Controller 2, Extended Mode Register
04D8h – 04DFh Reserved
04E0h – 04FFh DMA Channel Stop Registers
051Ch Software NMI (051Ch)
0678h – 067Ah Parallel Port (ECP)
0778h – 077Ah Parallel Port (ECP)
07BCh – 07Beh Parallel Port (ECP)
0CF8h PCI CONFIG_ADDRESS Register
0CF9h Intel® Server Board SUNPRAIRIE Turbo and
Reset Control
0CFCh PCI CONFIG_DATA Register
3.7.3 Accessing Configuration Space
All PCI devices contain PCI configuration space, accessed using mechanism #1 defined in the
PCI Local Bus Specification. If dual processors are used, only the processor designated as the
Boot Strap Processor (BSP) should perform PCI configuration space accesses. Precautions
should be taken to guarantee that only one processor performs system configuration.
Two Dword I/O registers in the chipset are used for the configuration space register access:
• CONFIG_ADDRESS (I/O address 0CF8h)
• CONFIG_DATA (I/O address 0CFCh)
When CONFIG_ADDRESS is written to with a 32-bit value selecting the bus number, device on
the bus, and specific configuration register in the device, a subsequent read or write of
CONFIG_DATA initiates the data transfer to/from the selected configuration register. Byte
enables are valid during accesses to CONFIG_DATA; they determine whether the configuration
register is being accessed or not. Only full Dword reads and writes to CONFIG_ADDRESS are
recognized as a configuration access by the chipset. All other I/O accesses to
CONFIG_ADDRESS are treated as normal I/O transactions.