Post Code Debugger; Isa And Pci Expansion Slots; Pci Device Mapping - Intel 440BX Manual

Hardware Reference
4.2

Post Code Debugger

The evaluation board has an on-board Post Code Debugger. Data from any code that does an I/O
write to 80H is latched on the two led displays (U12/U13). During BIOS startup, code is posted to
these LEDs to indicate what the BIOS is doing. Application code can post its own data to these
LEDs by doing an I/O write to address 80H. The 22V10 PLD code used to implement this function
is included in Appendix A, "PLD Code Listing."
4.3

ISA and PCI Expansion Slots

The evaluation platform has three PCI expansion slots and two ISA slots.
4.4

PCI Device Mapping

On the evaluation platform the PCI devices are mapped to PCI device numbers by connecting an
address line to the IDSEL signal of each PCI device. Table 4 shows the mapping of PCI devices.
Table 4.

PCI Device Mapping

PIIX4E
PCI Slot 0 (J7)
PCI Slot 1 (J8)
PCI Slot 2 (J9)
28
Device Address Line
AD18
AD28
AD29
AD30
®
Intel 440Bx Scalable Performance Board Development Kit Manual
PCI Device Number
7
17
18
19