UVM_BACKDOOR read() and write() methods also updates the properties of register field object?

UVM
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1

Dear All,

I’m trying to understand about backdoor access behavior.
But I’m confused the behavior of BACKDOOR access in write() and read() methods.

https://verificationacademy.com/cookbook/registers/backdooraccess
https://verificationacademy.com/cookbook/registers/backdooraccess#Tradeoffs_Between_Front_And_Backdoor_Accesses

If I use “UVM_BACKDOOR” read() and write() methods, It is also updated the all properties of register field object such as m_reset, m_mirrored, value, m_desired values? Or only just Read, Write the value in DUT by DPI without affecting the properties of register field object?

2

In reply to UVM_LOVE:

The problem is a backdoor access uses auto-prediction to set the mirrored values because there is no bus activity to monitor. If you have any special access modes, that for example sets or clears a bit, the register model might not be in sync with the hardware.