What is requirement on Ripple Voltage for Core or I/O Voltage Sources ... MPC8270/MPC8280
Freescale engineer comments post below for community members reference.
1. PLL supply noise
This has not been characterised. It is believed that tens of mV should be acceptable.
2. Core and I/O supplies noise
This has not been characterized. It is believed that 200-300 mV should be acceptable