rtwfroody
commented
1 month ago When I config the mc6.size=1, select=1, load=1, which means I want to trigger a load instruction whose access data equals the tdata2[7:0].
And my question is if a load instruction whose access size is 16bits but the low 8bits in the load data equals tdata2[7:0], Will this instruction match ?
No. For size=1 the spec says "The trigger will only match against 8-bit memory accesses."
Actually, I'm not sure about the size field for weather it is only used for indicating the compare data width for the execute/load/store data and tdata2 or it is also used to filter the real valid execute/load/store data to compare.
The size field filters accesses only. It does not affect the compare value. That is what the select field is for.
Another example, If I set mc6.size=2, select=0, execute=1, Could this configuration filter out the 32bits length instruction ?
For size=2, the spec says "The trigger will only match against 16-bit memory accesses or execution of 16-bit instructions." So that trigger would only fire when a 16-bit instruction is being executed (and other conditions specified by the match field etc. are satisfied).
micreven
Hi，All
I have a question about the mc6 trigger CSR's “size” field.
When I config the mc6.size=1, select=1, load=1, which means I want to trigger a load instruction whose access data equals the tdata2[7:0].
And my question is if a load instruction whose access size is 16bits but the low 8bits in the load data equals tdata2[7:0], Will this instruction match ?
Actually, I'm not sure about the size field for weather it is only used for indicating the compare data width for the execute/load/store data and tdata2 or it is also used to filter the real valid execute/load/store data to compare.
Another example, If I set mc6.size=2, select=0, execute=1, Could this configuration filter out the 32bits length instruction ?
Any help would be greatly appreciated！
Best regards， Micreven