Post
Topic
Board Hardware
Re: [ANN] Bitfury is looking for alpha-testers of first chips! FREE MONEY HERE!
by
goodney
on 06/11/2013, 19:14:45 UTC

Why do you have two chips for level shifting and what are they (can't see from the picture)?
For SCK and MOSI a resistor divider should be enough for single bank/chip. Also instead of the blue wires couldn't you just swap the wires going to the RPi at the top left of the board?


I have two level shifters so that I could support chaining with my board. One chip does 3.3->1.8 (inputs) and one does 1.8->3.3 (outputs). They are 74AVC4T245's

I couldn't just swap the RPi wires because I had fixed the direction of the level shifters on the PCB and I had MISO on the "input" converter. So I ended up having to swap MISO from the BF to the "output" level converter, and swap the RPi wire. One of the "fixes" on the board is because I cut the wrong trace. Don't start cutting traces right before lunch.

BTW, thanks for the cgminer fork. I get better results than chainminer (w/ proxy) and BFGMiner didn't work at all.

-a[g