One problem aboutXFC pin capacitor on MPC8260A?
I have debug the MPC8260ACZUMHB(266/166/66Mhz) succesfully, read PVR(00810101) and IMMR value(0024), the values indicate the chip is 0.29um(HiP3) version.
but now CPU changes to MPC8260ACZUMIB(266/200/66Mhz), the PVRand IMMR value(0062) indicate the chip is 0.25um(HiP4) version.
the same programm can't boot correctly, I try to change the XFC capacitor according MPC8260 Reference Manual, it still can't boot sucessfully, the UART(SMC1) outputs nothing.
min recommended max
MF*580-100 MF*680-120 MF*780-140
Aiso, I try to change core frequency and core voltage dependent on core frequency.
when core frequency is less than and equal to 200Mhz, the VDDL is set to 1.8V,
core frequency is greater than and equal to 233Mhz, the VDDL is set to 2.0V.
the frequency setting is 200/133/66, MF=2, XFC pin capacitor(1500pF), VDDL(1.8V).
or the frequency setting is 200/133/66,,MF=2, XFC pin capacitor(1500pF), VDDL(2.0V).
or the frequency setting is 266/166/66, MF=5, XFC pin capacitor(3500pF), VDDL(2.0V).
No matter which setting I select, the CPU can't boot succesfully, and UART outputs nothing.
Please help me to resolve the problem!