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.
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.
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 HB6248 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.
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 ;-)
Comments
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.
Andy
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)?