TPCE261 User Manual Issue 1.0.2
Page 9 of 20
4 PMC Interface
Installation of a PMC Module
The PMC modules are mounted to the TPCE261 prior to installation into the system.
Before installing a PMC module, be sure that the power supply for the TPCE261 is turned off.
The components are Electrostatic Sensitive Devices (ESD). Use an anti-static mat connected to
a wristband when handling or installing the components.
After the PMC module has been installed, it can be secured on the TPCE261 using the mounting screws that
come with the PMC module. There are four screw mounting locations, two at the PMC front panel and two at
the standoffs near the PMC bus connectors.
PCI Signaling Voltage
PMC modules are specified either for 3.3V only, 5V only or universal (3.3V or 5V) PCI signaling voltage
operation.
The TPCE261 onboard V_I/O voltage level defines the PCI signaling voltage level for the TPCE261 PCI bus.
A voltage keying pin indicates (and also selects) the voltage level and prevents incompatible PMC modules
from being plugged onto the carrier.
Table 4-1 : TPCE261 PCI Signaling Voltage Keying
V_I/O Configuration
5V Keying Pin
3.3V Keying Pin
5V (-x0R)
Installed
Not Installed
3.3V (-x1R)
Not Installed
Installed
Table 4-2 : TPCE261 PCI Signaling Voltage Factory Defaults
