SPC5744C JTAG PASSWORD&Life Cycle

[lyj]

HI:

I referred to MPC5748G to modify the JTAG password and lifecycle of SPC5744C, but I cannot connect to the chip.  (UDE STK5.2--------SPC5746C)

https://community.nxp.com/t5/NXP-Designs-Knowledge-Base/LifeCycle-s-management-of-MPC5748G/ta-p/1573...

1.program password

2.program dcf

3.program Life Cycle  to  OEM

4.use UDE connect chip to read  78.3.1 Life Cycle Status Register (PASS_LCSTAT) 

0xFFFF4000=0xE0000002

cns=1   Censorship!=0x55AA

jun=1  Successful transmission of the JTAG password sets this bit to '1'

life=2   OEM Production

5 after Write  DCF -addr 0x0010010c -value 0x40000000

UDE can't connect chip

May I know whether there was any misconfiguration?

[petervlna]

Hello,

Your procedure looks correct. Please have a look at attached script to see how it is done correctly maybe you will find some issues.

Let me ask few questions:

1. was the chip blank or any program was already on it?

2. How do you handle SWT_0?

Because if you do not handle SWT_0 it will cause reset before you are even able to connect via JTAG and execute censorship handshake routine.

So your device will be in endless SWT reset loop.

Best regards,

Peter

[lyj]

Thanks for the reply. 

The comparison script should be the same, except for LOCK0_PGx which I set to 0x00000000 instead of 0x0F000000.

1. was the chip blank or any program was already on it?

    chip is blank.

       password and dcf  program by jtag.

2. How do you handle SWT_0?

    no. 

      1.Does changing the lifecycle to "OEM" make the "swt_0" effective?

      2.disable swt_0 write dcf   "SWT_0_WDG_DIS =1"?

Are there any other settings that need to be configured?

[petervlna · Accepted solution]

Hello,

OK, then it is clear.

You locked out the chip and there is no way to recover from this state.

Once you use a new chip, make sure that SWT is handled or disabled before you program Life cycle and set censorship of device.

1.Does changing the lifecycle to "OEM" make the "swt_0" effective?

No, SWT_0 is by default set to 20ms and it is active. These are factory settings.

2.disable swt_0 write dcf   "SWT_0_WDG_DIS =1"?

You can disable SWT_0 during reset phase via DCF records. Please refer to reference manual for details.

Best regards,

Peter