Intel 41210 - Manual (Page 53)

Intel® 41210 Serial to Parallel PCI Bridge Design Guide 53
Circuit Implementations
10.2 Intel® 41210 Serial to Parallel PCI Bridge Reference
and Compensation Pins
There are three compensation pins on Intel® 41210 Serial to Parallel PCI Bridge.
PE_RCOMP[1:0] are two separate pins that provide voltage compensation for the PCI Express
interface on the Intel® 41210 Serial to Parallel PCI Bridge. The nominal compensation voltage is
0.5V. An external 24.9
Ω ±1% pullup resistor should be used to connect to VCC15. A single pullup
resistor can be used to for both of these signals.
RCOMP is an analog PCI interface compensation pin, providing 0.75V to the Intel® 41210 Serial
to Parallel PCI Bridge. A 100
Ω ±1% pulldown resistor should be used to connect the RCOMP pin
to ground.
These implementations are shown in Figure 26 .
Figure 26. Reference and Compensation Circuit Implementations
B2727 -01
PE_RCOMP[0]
Intel fi 41210
Bridge
PE_RCOMP[1]
RCOMP
R3 = 100
Ω
– 1%
R1 = 24.9
Ω
– 1%
0.75 V
0.5 V
0.5 V
VCC