For MPC8308 package, which is the GTX clock pin for TSEC1 and TSEC2?
According to the MPC8308 ballmap, V21 is the GTX clock pin of TSEC1 and T19 is the GTX clock pin of TSEC2.
Can a spread spectrum clock be used for the 66.66 Mhz DDR clock of the MPC8308? If so what percentage spread is allowed and what modulation frequency?
Yes, a spread spectrum clock can be used for 66.66 Mhz DDR clock. Please refer to below table for details:
Spread Spectrum Clock Source Recommendations
Parameter Min Max Unit Frequency modulation — 60 kHz Frequency spread — 1.0 %