lock bit using swwe - how to implement

[arnonsha]

I am trying to implement a locking bit called LOCK, which is part of my register file. when LOCK = 1 , writing to all other registers is disabled.
I am trying to do that using the swwe attribute. My rdl file looks like this:

When running peakrdl I get the following error:

            swwe = LOCKREG.LOCK;

I get this error also when I try swwe=LOCK

What am I doing wrong ?

[amykyta3]

Due to how namespace scopes work in SystemRDL, you cannot access LOCKREG directly from within the lexical scope of CSR1 or csr. Instead, try using a dynamic property assignment outside of the blocks:

reg {
    field {} LOCK[0:0] = 0;
} LOCKREG;

reg {
    field {} csr = 0;
} CSR1;

CSR1.csr->swwe = LOCKREG.LOCK;

Also unrelated - I see you are creating an alternate reset signal, presumably to override the default reset to be asynchronous. PeakRDL-regblock lets you set the default reset via the command-line (peakrdl regblock --default-reset arst ...) or via the tool's TOML config.

[arnonsha]

thank you @amykyta3

Indeed this is working, however I have 10s of fields that I need to lock. Sounds like I'll need a dedicated line for every field. I tried applying the lock bit on a whole register (CSR1->swwe = LOCKREG.LOCK) and got the following error:

fatal: The property 'swwe' is not valid for 'reg' components

Is there a more compact way to apply the locking on all the fields of a register ?

thanks

[amykyta3]

Yes you can apply the default assignment as follows:

reg {
    field {} LOCK[0:0] = 0;
} LOCKREG;

// Every field declared below here will be assigned swwe
default swwe = LOCKREG.LOCK;

reg {
    field {} csr_a = 0;
    field {} csr_b = 0;
    field {} csr_c = 0;
} CSR1;

[arnonsha]

Managed to make it work ! thank you for your support @amykyta3