HP D315 manual PCI Component Configuration Access, PCI Component Function, Device # Function #

Chapter 4 System Support

Two types of configuration cycles are used. A Type 0 (zero) cycle is targeted to a device on the PCI bus on which the cycle is running. A Type 1 cycle is targeted to a device on a downstream PCI bus as identified by bus number bits <23..16>. Figure 4-2 shows the configuration cycle format and how the loading of 0CF8h results in a Type 0 configuration cycle on the PCI bus. The Device Number (bits <15..11> determines which one of the AD31..11 lines is to be asserted high for the IDSEL signal, which acts as a “chip select” function for the PCI device to be configured. The function number (CF8h, bits <10..8>) is used to select a particular function within a PCI component.

Register 0CF8h

Results in:

31	24 23	16 15		11 10		8	7	2	1	0 [1]
	Reserved	Bus	Device		Function		Register
		Number	Number		Number			Index

AD31..0	IDSEL (only one signal line asserted)	Function	Register
(w/Type 00		Number	Index
Config. Cycle)

NOTES:

[1]Bits <1,0> : 00 = Type 0 Cycle, 01 = Type 1 cycle Type 01 cycle only. Reserved on Type 00 cycle.

Figure 4-2.Configuration Cycle

Table 4-1 shows the standard configuration of device numbers and IDSEL connections for components and slots residing on a PCI bus.

Table 4-1.PCI Device Configuration Access

Table 4-1.

PCI Component Configuration Access

	PCI				IDSEL
PCI Component: Function	Bus #	Device #	Function #	Device ID [4]	Wired to: [4]
IGP:					n/a
CPU Host Bridge	0	0	0	01A4h / 01E0h
Memory Configuration	0	0	1	01Ach / 01EBh
Memory Addr. Trans. Cntrl.	0	0	2	01ADh / 01EEh
Miscellaneous Control	0	0	3	01AAh / 01EDh
AGP Host	0	30	0	01B7h / 01E8h
Graphics processing unit [1]	1	0	0	01A0h / 01F0h
AGP slot	1	0	0	[3]	n/a
MCP:					n/a
Legacy LPC Bridge Control	0	1	0	01B2h / 0060h
SMBus Control	0	1	1	01B4h / 0064h
USB Controller A	0	2	0	01C2h / 0067h
USB Controller B	0	2	1	01C2h / 0067h
USB 2.0 Controller	0	2	2	na / 0068h
Network interface	0	4	0	[2] / 0066h
Audio processor		5	0	[2] / [2]
Audio Codec	0	6	1	01B1h / 006Ah
Modem Codec (not used)	0	6	0	01C1h / 0069h
PCI-PCI Bridge	0	8	0	01B8h / 006Ch
IDE Controller	0	9		01BCh / 006Dh
PCI Connector 1 (slot 1)	2	6 / 4	[3]	[3]	AD22 / AD20
PCI Connector 2 (slot 2)	2	7 / 9	[3]	[3]	AD23 / AD25
PCI Connector 3 (slot 3)	2	8 / 10	[3]	[3]	AD24 / AD26

NOTES:

All numbers are in decimal unless otherwise indicated.

Vender ID for all functions is 10DEh.

[1]Will not be “visible” to software if an AGP card is installed in the AGP slot.

[2]Not used in this systems.

[3]Determined by installed device.

[4]D315 / d325

4-4Compaq D315 and hp d325 Personal Computers Featuring the AMD Athlon XP Processor

Second Edition – April 2003