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P2 Motherboard for BeMicroCV-A9 proposal - features request + PCB LAYOUT
2016-02-26 - 23:47:36
edited 2016-02-26 - 23:53:12
IMHO, one DAC and a simple one for sync would allow for monochrome VGA displays 1, 2, 4, 8 bits per pixel, and TV with good FPGA pin economy. Also, that can drive an HDTV monochrome too. Just include sync and signal on the "Y" input on a device accepting component signals.
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Parallax colors simplified:
2016-02-27 - 03:35:26
I would assign the IOs like that:
The 0.1" header with 33 IOs: = Port A (32)
The Slide connector with 57 IOs:
- Port B (32)
- 4 DACs: 8 + 8 + 5 + 1 bits (22)
- ResN input from the FT232 DTR (1)
- maybe a USB pullup switch (1) = (56) total
PB31,30 connects to the FT232 RX,TX
PB29..26 connects to Flash chip and to an SDcard (exept CS)
PB25 = SDcard CS
PB24,23 = USB D+,D- wired to both USB connectors (use only one of them at the same time). This allows also to sniff a USB traffic between a PC and a USB device to analyze the protocol.
2016-03-21 - 06:23:56
I am finally getting around to this phase of my project and will hopefully have this new P2 control board back next week. Here's a skeleton layout for the PCB that's also designed to fit into a ots plastic box with clear lid. The 171x121x55 box is a
which I can pickup locally from Jaycar but obviously it can be sourced direct at a much better price. Make what you will of this scant information as I finish off the design.
Screenshot from 2016-03-21 16:30:13.png
1001 x 756
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2016-03-21 - 09:48:26
I like the idea having 2SD's, now we can swap them like floppys the old times. But before I can jump in here, I have to solve my problems with W5500 supply ;-)
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2016-03-22 - 02:58:53
Looks good peter.
Are you putting everything through the 80 pin MEC6 connector, or are the SD cards via the 40 pin headers (sub pcb connected to headers)?