Board Manual 61
Intel® IQ80321 I/O Processor E valuation Platform
Hardware Reference Section
3.10.9.8 Switch S8E1- 5When this input is pulled high (o ff), the bridge changes the out put impedance of the drivers t o the
opposite state than was assum ed by default, as shown in Ta ble 54 below:
3.10.9.9 Switch S8E1- 6When this input is pulled high (o ff), the bridge changes the out put impedance of the drivers t o the
opposite state than was assum ed by default, as shown in Ta ble 57 below:
3.10.9.8.1 Swi tch S8E1 - 5: Descriptions
Switch Association Description Factory Default
S8E1-5 PCI-X Bridge S_DRVR_MODE: Driver impedance selection f or
SPCI-X bus. On
Table 53. Switch S8E1 - 5: Settings and Operation Mode
S8E1-5 Operation Mode
Off PCI 66, PCI-X 66/100: 40 Ω im pe da nce.
PCI-X 133: 20 Ω impedance.
On PCI 66, PCI-X 66/100: 20 Ω impe dance.
PCI-X 133: 40 Ω impedance.
Table 54. Switch S8E1 - 5: Driver Mode Output Impedances
Secondary Bus Mode Default Driver Mode
(S_DRVR_MODE=0, On) Driver M ode when
(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)
Table 55. Switch S8E1 - 6: Des criptions
Switch Association Description Factory Default
S8E1-6 PCI-X Bridge P_DRVR_MODE: Driver impedance selection f or
PPCI-X bus. Off
Table 56. Switch S8E1 - 6: Settings and Operation Mode
S8E1-6 Operation Mode
Off PCI 66, PCI-X 66/100: 20 Ω im pe da nce.
PCI-X 133: 40 Ω impedance.
On PCI 66, PCI-X 66/100: 40 Ω impe dance.
PCI-X 133: 20 Ω impedance.
Table 57. Switch S8E1 - 6: Driver Mode Output Impedances
Primary Bus Mode Default Driver Mode
(P_DRVR_MODE=0, On) Driver M ode when
(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)