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20131011o
i prosjektet skal vi putte inn en hel del decoupling. det er masse kondensatorer som står mellom 1.2v og groudn og 2.5v og ground osv de skal ligge fysisk nært fpgaen og mikrokontrolleren det vil forhåpentligvis resultere i at spikes ikke når de
"dette ser ut som en veldig god ide basert på tilfeldige prosjekter jeg har sett på der det ser ut som at folk spammer kondensatorer rundt om kring"
Odd Rune's design tips:
- Place some headers on the board hooked up to the different voltages in case we need that.
For the logical design (in other words find some schematics for):
- Crystal
- Oscillator
- Power switch
Checkin' out 256SoG's repo.
Wait the crystal goes on the microcontroller, yeah?
Where the hell did 256SoG place their crystal? Why did they order so many crystals?
Found the crystal in their schematic. It's a box with two pins going out simply labeled "2" and "1". The lines go to ports on the FPGA I think but also split into a connection with a 22pF capacitor followed by GND.
Looks like we can't use 256SoG/Festinalente's crystal footprint because it seems like it's a through-hole mount type deal.
Made a schematic. Haven't made a footprint yet. No idea how it should be hooked up so I'm just leaving it as it is until Rune gets back.
Again, lookin' at 256SoG's schematics.
PAD/Pin function on oscillator (from datasheet):
- 1: ENABLE CONTROL
- 2: GND
- 3: OUT
- 4: VDD
Finished the component schematic. Not doing anything else with it until Rune gets back because I am confused.
We've got the G3T13AP. It's the upright mounted version of the G3T series. It has SPDT Poles, ON-OFF-ON circuit, 3.8mm actuator column toggle (i don't know what that is).
It should have power coming in on pin/terminal number 5, and the 'out' should be pin/terminal number 4 and 6.
It has 3 pins.
Aaand it's done.
I've placed ports and headers and made a schematic file for it that's now hooked up for the PSU so this thing is done.
How the hell do I hook this thing up? Well that wasn't too hard.
Gotta have 2x0.1uF capacitors 4 dat crystal, yo.
Finished with the crystal, oscillator and power switch toggle schematics. Just need to make footprints.