why is the caravel wrapper required (as opposed to...
# sky130a
Andrew Hodges
08/06/2022, 12:02 PMwhy is the caravel wrapper required (as opposed to optional)? is it because the fab needs to be able to test the chips, and they couldn't do that with a fully custom design? or is it because there are packaging details that just can't be made public enough for you to design your own?
Andrew Hodges
08/06/2022, 12:04 PMi'm very new to all this, so maybe the answer is something like "every fab process has something like this, there's no alternative"
i
Ivan Rodriguez
08/06/2022, 12:29 PMAs far as I know is because your design is inside of other design, this is call the harness, and that simplifies the design of you asic, making available the I/O, that is not a simple wire, and the Risc V core that manage your design.
Creating this wrapper allows efabless to use that standard harness to the standard interface that is the wrapper.
m
Matt Liberty
08/07/2022, 5:15 AMIts not a fab requirement and is to create a standard interface for packaging for all MPWs. It also provides convenience for the designer.