MPC5746R Hardware Design Guide, Rev. 1
Power Supply
NXP Semiconductors6
3.1.3 Multi Supply - 5 V and 3.3 V
In this configuration there are dual supply voltages, 5 V and 3.3 V. The 5 V supply provides the I/O supply,
the internal regulator provides the 1.25 V core supply and the 3.3 V supply is used to power the FEC
subnet.
Figure 2. Multi Supply, 5 V and 3.3 V with Ethernet
NOTE
VDD_HV_IO_JTAG and/or VDD_HV_IO_MSC could also be powered by
3.3 V.
3.1.4 Multi Supply: 5.0 V and 1.25 V
In this configuration there are dual supply voltages, 5 V and 1.25 V. I/O is powered by the 5 V supply and
the core voltage is powered by the 1.25 V supply. Note that most Fast Ethernet Controller (FEC) physical
layer interfaces require 3.3 V signals, so the FEC would not normally be operational in this configuration.
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