I'm using Processor Expert Build: RT4_b1316-1577
bundled with CodeWarrior 10.4 Build Id:130425
Processor: MCF52235CAL60
Component: Init_FEC
My System Clock is 60MHz.
According to MCF52235 Reference Manual Table 18-19
in Settings -> Clock settings -> MII speed divisor I specified 13.
Now Settings -> Clock settings -> MII Clock frequency should be 2.5MHz, but it shows 1.1538
Description in PE states:
"Expected MII clock frequency (for information only). This item is influenced by the MII speed divisor property.
The value is calculated using the formula:
Clock frequency = Bus clock frequency * (1 / (MII speed divisor * 2))"
while in Reference Manual:
"If the system clock is 25 MHz, programming thisregister to 0x0000_0005 results in an EMDC frequency
of 25 MHz 1/ (5 2) = 2.5 MHz."
Is it bug or I misunderstanding something?
Solved! Go to Solution.
Hello,
according to the RM desctipiton seems that "MII clock frequency" item in init_FEC component provides incorrect values. The calculations correpsonds to the Bus clock. As workaround please ignore its value. We will try to fix it for next release.
Best regards
Vojtech Filip
Processor Expert Support Team
Hello,
according to the RM desctipiton seems that "MII clock frequency" item in init_FEC component provides incorrect values. The calculations correpsonds to the Bus clock. As workaround please ignore its value. We will try to fix it for next release.
Best regards
Vojtech Filip
Processor Expert Support Team
Even worse.
I setting Settings -> Clock settings -> 10BASE-T PLL to false.
Generating files.
Saving generated FEC.c.
Then setting 10BASE-T PLL to true, generating again.
Then I compare two FEC.c files in merge utility.
I see changes in generation Date/Time.
Textual comment
** 10BASE-T PLL : Disabled
becomes
** 10BASE-T PLL : Enabled
But NO difference in registers setting part.
Am I understanding right, that FEC:Init_FEC component is not production ready currently?
Hello,
can you check/compare CPU.c? I believe this setting might be reflected there.
Worth a look I think.
Yes, you're right. Thanks. My fault, I had to compare directories from beginning.
So only issue from first post with MII Clock frequency remains.