Hello,
I am attempting to implement the technical note for a quadrature encoder to SPI-based counter described in AN-CM-277 in order to take a load off our microprocessor as it's needing to keep track of 18 encoders.
I've purchased the following items from Digikey:
- GreenPAK Universal Dev Board 1, Rev 1.3.1
- SLG46140V-SKT
Attempting to emulate the chip with the logic file supplied for AN-CM-277 either returns a "Chip not connected properly error" or a socket test error (as attached). When I attempt to read from the chip I get a "NVM is locked, Pattern ID 0" error if it passes the socket test. Otherwise I tend to get the same socket issue.
I took a look at my 'victim' SLG46140V under a stereoscope and it looks like the pogos are hitting the correct pads and nothing looks particularly 'off', so I am hoping someone can point me in the right direction on how to troubleshoot the issue.
I've tried the following steps to rule out my computer:
- Swap USB ports (all tested)
- Restart GreenPAK Designer
- Restart PC
- Attempt to reseat chip
- Replace chip (definitely wasn't lost in a carpet)
- Replace with another chip from the other side of the sample tape
Any advice would be immensely helpful. Thanks.
