Copyright © 2009 Purdea Andrei
The s3e-sk, and the 7seg board
The hexadecimal timer in action  download video download image
The back of the 7seg
Waveforms in gtkwave

7seg s3e-sk extension board

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I own a Xilinx Spartan 3E Starter Kit FPGA board. Something that is quite frustrating about it is that it has no 7 segment displays, and very few buttons. So i decided to build a simple extension board for it. The big Hirose connector on the side is quite hard to find, so i went with two 6-pin headers.

Obviously the 8 i/o ports provided by them could only connect a single 7(8)-segment display, but with adding a few shift registers and making the communication serial it is possible to add more. I only implemented 4 digits, but by daisy chaining more shift registers, it is possible to extend it even more very easily.

Downloads:

There are two pieces of code. one is written completely in verilog, and the other one is mostly schematic and a little vhdl.