Texas Instruments PCI2250, User Manual, Page: 16 / 28

LED Indicators
4-4
4.3 LED Indicators
4.3.1 D1 ENUM
When the PCI2250 is configured in CompactPCI mode, this LED lights when
the ENUM signal is driven low.
4.3.2 D2 HSLED
When the PCI2250 is configured in Compact PCI mode, this LED lights when
the HSLED signal is driven low.
4.3.3 D3 C1_PRES
D3 lights when a PCI board that has the PRSNT2 pin tied to ground is inserted
in connector P1.
4.3.4 D4 C2_PRES
D4 lights when a PCI board that has the PRSNT2 pin tied to ground is inserted
in connector P2.
4.3.5 D5 C3_PRES
D5 lights when a PCI board that has the PRSNT2 pin tied to ground is inserted
in connector P3.
4.3.6 D6 EVM3V
D6 lights to indicate that 3.3 V is available on the secondary bus.
4.3.7 D7 PCU3V
D7 lights to indicate that the PCI2250 has power applied to the core logic.
4.4 Power Measurements
In order to measure the current drawn by the core logic or one of the VIO rails
of the PCI2250 it is necessary to isolate the power supplied to these pins from
the rest of the system. This can be done by cutting the trace that connects the
power pins to the system. Jumpers J6, J7, and J8 have default traces that are
provided for this purpose. After the traces are cut, an external power supply
can be used along with a current meter to measure the current used by the
selected power rail. The power rail can then be reconnected to the system by
placing a jumper across the cut trace.