Field takes value from other field

[SanaUllah]

Hello,

I am facing problem in IP-XACT some of register/field are read-only. While reading these registers just giving current value from there link register. Can you help me to implement this kind of register in IP-XACT instead of making it volatile.

thanks

[kock]

Hello,

The old versions of the IP-XACT standard up to and including IEEE Std 1685-2014 do not support describing register field aliasing. Please contact your EDA vendor to check if they can support it with some vendor extension. The new version IEEE Std 1685-2022 does support it. This version will be published by IEEE within a few weeks. Please see the blue lines in the XML snippet below for an example:

                <ipxact:register>
                    <ipxact:name>INTENCLR</ipxact:name>
                    <ipxact:shortDescription>Interrupt Enable Clear register.</ipxact:shortDescription>
                    <ipxact:description>Interrupt Enable Clear register. Collection of interrupt enable clear commands affecting the INTENSET register state.</ipxact:description>
                    <ipxact:addressOffset>'h208</ipxact:addressOffset>
                    <ipxact:size>32</ipxact:size>
                    <ipxact:accessPolicies>
                        <ipxact:accessPolicy>
                            <ipxact:access>read-write</ipxact:access>
                        </ipxact:accessPolicy>
                    </ipxact:accessPolicies>
                    <ipxact:field>
                        <ipxact:name>FIELD0</ipxact:name>
                        <ipxact:description>Interrupt enable clear.</ipxact:description>
                        <ipxact:bitOffset>0</ipxact:bitOffset>
                        <ipxact:aliasOf>
                            <ipxact:memoryMapRef memoryMapRef="RegisterMap"/>
                            <ipxact:addressBlockRef addressBlockRef="RegisterBlock"/>
                            <ipxact:registerRef registerRef="INTENSET"/>
                            <ipxact:fieldRef fieldRef="FIELD0"/>
                        </ipxact:aliasOf>
                        ...

The blue lines describe that field INTENCLR.FIELD0 is an alias of field INTENSET.FIELD0. Both fields can have a different access value. If INTENSET.FIELD0 is read-only, then its values can still be modified by writing to INTENCLR.FIELD0.

Best regards,
Erwin