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# mpw-one-siliconm
Matt Venn
05/02/2022, 3:56 PM@User
j
James A
05/03/2022, 6:56 AMThanks! Will compare within 9 hours
m
Matt Venn
05/03/2022, 8:24 AMIf you send me your binary i can also try with that
j
James A
05/03/2022, 2:21 PMThe binary under test is the same vdd-scan. There are some obvious differences in the waveforms. We will start with slowing the clock and share the results.
James A
05/03/2022, 3:02 PM@User Can you share the output from vdd-scan operation?
m
Matt Venn
05/03/2022, 3:03 PMAs in the sram read writes while i run vddscan?
j
James A
05/03/2022, 7:00 PMThe same view: SPI from flash emulation. It looks like our boards are resetting during the program reads. A couple taps around successful vdd-scan would be helpful.
m
Matt Venn
05/03/2022, 7:00 PMTaps?
j
James A
05/04/2022, 12:50 AMfor n(0) passing --> good vdd:
n(-1) and n(0)
n(1) would be helpful, too.
m
Matt Venn
05/04/2022, 8:13 AMsorry, still don't understand
Matt Venn
05/04/2022, 8:14 AMwhat is n(-1) n(1), this is nomenclature I've not seen before
Matt Venn
05/04/2022, 9:12 AMAlso, I don't know why but I'm no longer able to do vdd scans
Matt Venn
05/04/2022, 9:12 AMI just get 230 as the number of reads no matter the chip or supply voltage
j
James A
05/04/2022, 11:18 PMWith more experimentation, we were able to get a reliable sequence for loading an image.
The io-mapper runs 80% with a lower voltage compared with vdd-scan. When it hangs, a vdd ramp is needed to recover it.
James A
05/04/2022, 11:19 PMIn terms of io-mapper, does MM, MM+-1 result imply that user mode is not accessilbe?