"The Thing": a new Multicomp FPGA board... [message #3726] |
Sun, 12 November 2017 06:13 |
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just4fun
Messages: 273 Registered: May 2017 Location: Dark side of the Moon
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Senior Member |
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Hi all,
I'm just starting now to design an Open Source FPGA board (Cyclone II based) and I'd like to make it "compatible" with the Multicomp project.
I'm now in the early stage of "info gathering", and I'm reading the documentation on the Grant's site and here, and starting to analyze the Quartus II projects.
The board that I've in mind is a beginners low cost FPGA dev board (probably with a M3 Cortex "support" MCU as I did for a previous CPLD dev board), and with some "stuff" like leds, keys, and a 7-segment 4 digits display. I'd like to make this board "compatible" with the Multicomp, adding the SRAM, SD socket, VGA output, etc.
I'm trying to maintain the original FPGA pin assignment, but I've noticed that the DEV_CLRn (FPGA pin 142) is used, and this is "annoying" for me because I want connect it to a key (to clear all the internal FFs), and the same with DEV_OE (to a switch, but this one is not used in the Multicomp).
More, changing others FPGA pins assignments can be handy in the PCB layout phase.
Of course this will require to change the "swapped" pins assignments accordingly in the Quartus II project, but this is not a big problem.
I'm just wondering if "swapping" some FPGA physical pins can cause any FPGA problem with the Multicomp... (may be I'm over estimating this thing)
Any advice...?
Cheers
[Updated on: Thu, 31 January 2019 08:42] Report message to a moderator
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