pwr_mgmt_fpu_sleep_prepare fails with assert

[Allen]

Hello,

We have an application with a S132 device, SDK 14 and Softdevice v5.0.0. On some devices, an assert is being thrown in the sleep prepare function. This is the line ASSERT((fpscr & 0x07) == 0);

What could the possible cause of this be? Is there any special PCB support required for this to work? The devices that work have a different PCB revision. Is there chip errata pertaining to this?

Thanks

[Allen]

This issue must be an errata with the processor. However I have not been able to find an errata regarding this so we do not know which versions of the chip has the issue. I have tested 4 different processors. 3 of the exhibited the issue. 1 processor seemed to work.

Perhaps we can solve the problem by avoiding certains serial numbers or processor lots? Any information regarding this would be appreciated.