Project Seasons work in Progress 5

Recently Happy_bunny updated the firmware, support the GameCube digital audio output to HDMI, I also download the latest firmware synchronously, but there is a problem in the experiment:

Can see the image has a lot of green noise, and the sound is all noise, even the HDMI signal will be interrupted, and Happy_bunny discussed, he did not know why this, I have been in the diff code Changes in the code can not be resolved, this time I suddenly brainwave, move out the big kill device:

Using an oscilloscope to see the input and output of an LDO powered by the FPGA core, you can see a large amount of ripple and the output voltage is not stable.

Happy_bunny Given the parameters are all 100nF, in fact, this is not meet the mcp1826s official reference design, in order to make mcp1826s normal work, the official recommended 1000nF above, that is 1uF.

So I turned out 3 20v,1uf tantalum electrolysis, not only to the Ldo filter capacitor in parallel, but also to the FPGA IO power to increase the return:

In the background that three is ready to increase the tantalum electrolysis, very small, attention is superimposed, and did not remove the original chip capacitor, the two boards are so processed:

After welding, again connected to the TV test, perfect, GameCube digital video audio signal perfect through the HDMI presented on the TV, a complete.

You can see the video above Youku: http://v.youku.com/v_show/id_XMTMyNzIxMDM3Mg==.html

Project Seasons work in Progress 5