TPCE261 User Manual Issue 1.0.2
Page 11 of 20
PMC BUSMODE[4:1] Signals
The BUSMODE[4:1]# signals are defined in the IEEE1386 (CMC) specification and allow a host to identify
the used mezzanine card type. The TPCE261 supports PCI capable cards only.
The TPCE261 indicates the “PMC only” support with the signal levels presented in the table below. The PMC
card should decode these signals and drive out a logic “0” on BUSMODE1#.
An onboard LED indicates if a valid PMC is detected.
Signal
Logic Level
BUSMODE4#
Pulled LOW
BUSMODE3#
Pulled LOW
BUSMODE2#
Pulled HIGH
Table 4-5 : TPCE261 PMC BUSMODE[4:1] Signals
Stable Power Supply
The power supply for the PMC slot is stable approximately 5ms after the system power supply is stable.
Power Limits for PMC Modules
The following current limits have to be taken into account when choosing the appropriate TPCE261 for the
power requirements of the XMC module.
TPCE261
Voltage
Current Limits
TPCE261-1xR
3.3V
3 A
5V
2 A
+12V
200 mA
-12V
200 mA
TPCE261-2xR
3.3V
8 A
5V
5 A
+12V
200 mA
-12V
200 mA
Table 4-6 : Current Limits for the PMC Modules
