topic Re: mpc5744p with Reset Generation Module (MC_RGM). in MPC5xxx

mpc5744p with Reset Generation Module (MC_RGM).

jaureshsieh — Tue, 17 May 2016 01:15:44 GMT

mpc5744p with Reset Generation Module (MC_RGM).

i have a customer return the mpc5744p board.

the mcu always doing reset.

i check the reset by mcu self.

but i don't know why the mcu which reason to do reset?

do you have any source code to test the which reason doing reset?

likes 3.3v ovp,1.25v over voltage.

ram,flash ecc ,fccu mc33907 error.

external xtal fail...

our board use mc33907 provide 3.3v with 1.25v.

and do you have detail document for MC_RGM

i just want to check the mpc5742p with 33907 that which reason bad.

i need write 8D report to customer.

so i need analyzer which reason fail .

could you help me to program the test code?

i use trace32 ,cyclone-max debug tool.

S32 compiler and windriver 5.9.4.8

Re: mpc5744p with Reset Generation Module (MC_RGM).

petervlna — Tue, 17 May 2016 05:43:18 GMT

Hi,

First of all tell me what is "always doing reset"?

1. Device is in permanent reset

2. Is reseting in intervals?

Is it possible to connect with debugger?

There is no test code for reset reasons.

You can write it according to ISO demands for your target safety class.

If it is possible to connect with debugger I suggest you to check FES and DES registers in RGM(reset generation module) for reset reason.

Peter.

Re: mpc5744p with Reset Generation Module (MC_RGM).

jaureshsieh — Tue, 17 May 2016 10:42:08 GMT

MPC5742P RESET PIN(31)

Re: mpc5744p with Reset Generation Module (MC_RGM).

jasoncao — Wed, 18 May 2016 00:39:18 GMT

I guess that may be you need to check the 33907/8

Re: mpc5744p with Reset Generation Module (MC_RGM).

jaureshsieh — Wed, 18 May 2016 05:49:26 GMT

I had check the 33907,that reset reason from 5742p,33907 not do reset!

Re: mpc5744p with Reset Generation Module (MC_RGM).

petervlna — Thu, 19 May 2016 06:11:56 GMT

I can guide you to the reset source, but not with information you have provided.

Re: mpc5744p with Reset Generation Module (MC_RGM).

jaureshsieh — Fri, 20 May 2016 08:27:06 GMT

i use the trace32 debug tools to see the MC_RGM

but i want to use code to test the which reason reset,

and fccu to detect the xtal fail,vcc ovp,....

Re: mpc5744p with Reset Generation Module (MC_RGM).

petervlna — Mon, 23 May 2016 06:46:15 GMT

Hi,

From your DES register I can see that your voltage was out of range.You need to measure the power supply pin VDDHV while reset occurs.

I expect some drops on supply voltage which caused your reset. Maybe weak power source.

You can also apply external power from regulated power supply to exclude any drops\peaks in voltage.

If you want to write code just test DES and FES registers and based on fault detected take actions.

Also FCCU will tell you what was exactly the reason for reset. Like LVD, HVD, etc.

I suggest to have a look also on my application note for FCCU faults:

http://cache.nxp.com/files/32bit/doc/app_note/AN5259.pdf?fsrch=1&sr=3&pageNum=1

Peter

Re: mpc5744p with Reset Generation Module (MC_RGM).

jaureshsieh — Mon, 23 May 2016 07:15:45 GMT

if external 40 MHZ Xtal fault that how to read register to check xtal fault?

Re: mpc5744p with Reset Generation Module (MC_RGM).

petervlna — Mon, 23 May 2016 08:30:21 GMT

This is monitored by FCCU.

FCCU reports fault NCF[26].

To read this fault use procedure described in my application note:

http://cache.nxp.com/files/microcontrollers/doc/app_note/AN5284.pdf?fsrch=1&sr=2&pageNum=1

There are also application example codes.

Peter

Re: mpc5744p with Reset Generation Module (MC_RGM).

jaureshsieh — Mon, 23 May 2016 08:34:47 GMT

your code only to FCCU.NCF_S[2].R

FCCU_status[0] = FCCU.NCF_S[0].R; //read FCCU.NCF_S0 register FCCU_status[1] = FCCU.NCF_S[1].R; //read FCCU.NCF_S1 register FCCU_status[2] = FCCU.NCF_S[2].R; //read FCCU.NCF_S2 register

which one say NCF[26]?

Re: mpc5744p with Reset Generation Module (MC_RGM).

petervlna — Mon, 23 May 2016 11:46:28 GMT

NCFS0 register is 32-bit and contain first 32 faults.

So NCF26 is located here in NCFS_0: