TMS570LC4357: BIST time

Hello Given,

After PLL slip happens, the PLL clock switches to the OSC. After PLL selftest (PLL slip), please follow the procedure (TRM, 14.5.4 recovery from a PLL failure) to recover the PLL.

Hi QJ,

Thanks for your reply. But it seems still cannot solve customer's question.

Customer has read the part you mentioned in your reply before, then they do debug on check PLLSLIP.

So please kindly check the questions " please kindly check if the issue is caused by the function and if the work-around above is reasonable." . Thanks.

BRs

Given

Hello Given,

The workaround looks fine, but it may not work for all the PLL settings. When the PLL slip occurs, please follow the recovery procedure to recover it. Customer should use a while() to check the flag instead of adding a delay function.

1. Switch all clock domains from PLL1 to the oscillator

HL_systemREG1->GHVSRC = 0x0U;

2. Disable PLL1

HL_systemREG1->CSDISSET = 0x2U;

3. Wait till PLL1 is disabled

 while((HL_systemREG1->CSDIS & 0x2U) == 0U){

 } /* Wait */

4. Restore the PLL multiplier value

HL_systemREG1->PLLCTL1 ^= 0x8000U;

5. Enable PLL1

HL_systemREG1->CSDISCLR = 0x2U;

6. Wait till PLL1 is enabled

while((HL_systemREG1->CSDIS & 0x2U) != 0U){

 } /* Wait */

7. Switch back to the initial clock source

HL_systemREG1->GHVSRC = ghvsrc_backup_value;

8. Clear PLL slip flag

HL_systemREG1->GBLSTAT = 0x300U;

9. Clear ESM flag

HL_esmREG->SR1[0U] = 0x400U;

10. Restore the PLLCTL1 register

HL_systemREG1->PLLCTL1 = pllctl1_backup_value;

Hi Qingjun,

Thanks for your reply. customer feedback it's hard to apply while{}. 

Customer's main request is to 

a. Is there something wrong on Check Pllslip funciton? 

b. why does changing the code in initialization trigger the issue? 

Thanks. 

BRs

Given

Hello Given,

The safety library doesn't have PLL slip selftest. It has ESM application callback function to handle the ESM errors. But there is no ESM callback in case of failures in the selftest.

If you manually trigger the PLL slip (tell me how did you do it), the clock source is switched to OSC automatically, and the ESM callback function doesn't recover the PLL from the PLL slip. After PLL slip happens, you need to follow the procedure listed in my previous post to recover the PLL.

Can you tell me which function in the safety diagnostic library is used for your PLL selftest?

Hi QJ,

Thanks for your reply .

Regarding your questions, customer just call the checkPLL1slip and check PLLslip2 function. These are in the safelib library, demo_app - common-source file - faultinject.c.

Thanks.

BRs

Given

Hello Given,

Thanks. I just checked the PLL slip function, Everything looks fine except for this instruction:

I think the while() loop should not be commented out.

This function restores the PLL after the PLL slip (expected).

Hi QJ,

Thanks for your reply.

But customer feedback in released version they received, this sentence is not comment out actually. Please kindly check. Thanks.

BRs

Given