The Papilio Arcade Kit is a DIY kit thatprovides everything needed to recreateclassic Arcade games such as Pac-Man.Open Source HDL projects provide thehardware definition for study,implementation, and extending.The Papilio Arcade Wing provides, 12bitVGA, Delta-Sigma Audio, and DB9 Joystickports.
ZPUino is an implementation of the 32-bit Open Source ZPU processor. It is a small implementation that is meant to be used with the Arduino IDE. It is capable of speeds up to 100Mhz and can run on the Papilio Platform.
We can add a RC if needed, just to raise it slowly during startup if needed.
My SDRAM controller does not at use CKE at all, but the pin may have been ground when the board powers up. I guess we can do some testing first.
Regarding SDRAM CKE: I'll point out that the data sheet's "recommended power-up sequence for SDRAM" includes bringing CKE low and then high again. Although it doesn't say how long it needs to be low -- Hamster's SDRAM controller only does it for a single clock cycle, no longer, so it probably doesn't make any difference.
I can't get this to work, all i get is "Digilent Plugin: no JTAG device was found.", on plugin version 2.4.4 or 2.5.2
I'm using a generic ft2232h breakout that i've set to use the FTDI vid/pid (and even tried setting the correct manuf/description as well as user area contents, no change).
It's supposed to show up as USB Serial Converter A and B, right ?
max_counter has an initial value of all 1's but never assigned any other value so it's basically a constant. The warning is just another way of saying that.
As for the timing of this block, I'm not sure what you are trying to accomplish here. A 20 bit PWM circuit clocked at 200 MHz will have a period of about 200 Hz so you will need a very low frequency low-pass filter (~50 Hz) on the PWM output if you are trying to implement some sort of DAC. In general, for PWM DACs and delta-sigma DACs, the more bits of resolution you have the lower frequency components will show up on the output. Maybe your application is fine with a 50 Hz cut-off on the output, if not then I suggest rethinking your design.
I'm not sure this relates to your project but this thread might have useful information: http://forum.gadgetfactory.net/index.php?/topic/2378-cd-quality-audio-441khz-delta-sigma-dac-spartan-6/
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