I am looking at a couple of S7 boards with a few dead chips.  Many upstream chips look good, but I'm having trouble communicating with them to verify.

Does anyone know if the BM1385 CRC5 is the same as the BM1384 CRC5?  Meaning 84 00 00 11 is a complete getstatus command..

I was considering pulling the whole tier of chips and undervolting ala this thread to compensate, but I *believe* that the ribbon cable's TX is non-level shifted, while the CI at the input side of each tier IS level shifted.  Meaning it won't talk unless I negatively level shift the ribbon's TX, which I'm not thrilled about doing.

I am currently considering pulling one tier + one chip of the next tier to access a non-level-shifted CI and strapping in a diode or a flipped-over 1385 to take up the extra current, but that's major surgery.  Best to make sure I'm sending the right command before pulling 4 chips and getting my splice on, heh.