Intel IQ80219 manual Switch S8E1 - 5 Descriptions, Switch S8E1 - 5 Settings and Operation Mode

Intel® IQ80219 General Purpose PCI Processor Evaluation Platform

Hardware Reference Section

3.10.9.8Switch S8E1- 5

When this input is pulled high (off), the bridge changes the output impedance of the drivers to the opposite state than was assumed by default, as shown in Table 54 below:

3.10.9.8.1Switch S8E1 - 5: Descriptions

Switch	Association	Description	Factory Default
S8E1-5	PCI-X Bridge	S_DRVR_MODE: Driver impedance selection for	On
		SPCI-X bus.

Table 53.	Switch S8E1 - 5: Settings and Operation Mode
	S8E1-5				Operation Mode
	Off	PCI 66, PCI-X 66/100: 40 Ω			impedance.
		PCI-X 133: 20	Ω	impedance.
	On	PCI 66, PCI-X 66/100: 20 Ω			impedance.
		PCI-X 133: 40	Ω	impedance.

Table 54.	Switch S8E1 - 5: Driver Mode Output Impedances
	Secondary Bus Mode	Default Driver Mode		Driver Mode when
		(S_DRVR_MODE=0, On)		(S_DRVR_MODE=1, Off)
	Conventional PCI	Multi-point (20 Ω	)	Point-to-point (40 Ω	)
	PCI-X 66	Multi-point (20 Ω	)	Point-to-point (40 Ω	)
	PCI-X 100	Multi-point (20 Ω	)	Point-to-point (40 Ω	)
	PCI-X 133	Point-to-point (40 Ω )		Multi-point (20 Ω )

3.10.9.9Switch S8E1- 6

When this input is pulled high (off), the bridge changes the output impedance of the drivers to the opposite state than was assumed by default, as shown in Table 57 below:

Table 55.	Switch S8E1 - 6: Descriptions
	Switch	Association	Description	Factory Default
	S8E1-6	PCI-X Bridge	P_DRVR_MODE: Driver impedance selection for	Off
			PPCI-X bus.

Table 56.	Switch S8E1 - 6: Settings and Operation Mode
	S8E1-6				Operation Mode
	Off	PCI 66, PCI-X 66/100: 20 Ω			impedance.
		PCI-X 133: 40	Ω	impedance.
	On	PCI 66, PCI-X 66/100: 40 Ω			impedance.
		PCI-X 133: 20	Ω	impedance.

Table 57.	Switch S8E1 - 6: Driver Mode Output Impedances
	Primary Bus Mode	Default Driver Mode		Driver Mode when
		(P_DRVR_MODE=0, On)		(P_DRVR_MODE=1, Off)
	Conventional PCI	Multi-point (20 Ω	)	Point-to-point (40 Ω	)
	PCI-X 66	Multi-point (20 Ω	)	Point-to-point (40 Ω	)
	PCI-X 100	Multi-point (20 Ω	)	Point-to-point (40 Ω	)
	PCI-X 133	Point-to-point (40 Ω )		Multi-point (20 Ω )

Board Manual 61