CPLD EduBoard

Education/Testing board for Lattice M4A5-32/64 CPLD

Marcin Byczuk

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Description

I designed this board to teach students how do build simple (and quite complex) digital systems. No hardwired connections, everything is flexible. Onboard 4 CLPDs and many peripherals, e.g. 2x 32kB RAM, 7-segment LED displays, BCD to 7-segment decoder, LCD alphanumeric display, I2C devices (EEPROM, RTC, 8-channel 6-bit DAC), 4x4 matrix keypad, 8 pushbuttons with optional debouncing, 8-bit DAC with analog comparator, small speaker with power amplifier, video signal formatter, RS232/TTL converter, PS/2 socket, iButton socket, 8x 8-bit bus with 4-state monitoring (no, it's not a mistake - more info in details), signal generators, many switches and LEDs.

Lots of fun! :)

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Discussions

Hacker404 wrote 09/30/2015 at 10:53

CPLD is XC95xx(x)XL - PLCC44 ?

Are you sure? yes | no

Marcin Byczuk wrote 09/30/2015 at 11:11

No, it's Lattice MACH series, M4A5-64/32

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Hacker404 wrote 09/30/2015 at 11:13

ok ... MACH 4 - 64 macrocells 32 IO ?

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Hacker404 wrote 09/30/2015 at 11:14

Weren’t they based on the industry standard 22v10?

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Marcin Byczuk wrote 09/30/2015 at 11:24

64 macrocells, 32 I/O pins (+2 input pins)

They differ from 22v10 devices, MACHs are a little more complex and more flexible

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Hacker404 wrote 09/30/2015 at 11:32

ok, I thought they had the same macros as the 22v10's just more of them with more interconnect.

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Winston wrote 07/17/2015 at 20:27

Looks very interesting and useful for training. I see your name and a 2008 date on the photo of the PCB. Do you have any estimate on the total cost?

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Marcin Byczuk wrote 07/20/2015 at 07:25

Maybe $300 ? It was 7 year ago and I built 12 pieces of this board - 2 prototypes and 10 pcs of final version. Hard to recall exact costs..

Moreover THT soldering and mechanical work I did myself. It took me a whole week (2 boards a day). Soon I'll place a list of components.

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matseng wrote 07/17/2015 at 09:06

Bigass PCB. I guess that just the PCB costs more than all the parts on it ;-)
But nice unit, I wish I had one...

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Marcin Byczuk wrote 07/17/2015 at 11:34

You're right, as I remember the costs of PCB and all other components were similar. The board is quite big - 44cm x 28cm. A torture tool for lazy students :)

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