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Altera_Forum's avatar
Altera_Forum
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14 years ago

GPIO MHz Operation, What is OK?

I am using the DE1 board with EP2C20F484C7. I am wanting to send out data to external custom circuitry: op-amps, fiber optic drivers, etc. I want to send data at about 25MHz max if I can. ...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
14 years ago

The fiber is going to use TOSLINK cable...

I am going to try and convert data from the FPGAs M4K blocks into different line codes (Manchester, 4B5B, Unipolar, B3ZS, 4B3T, etc) and sending these over fiber, coax, twisted pair, and non-twisted. I am hoping to do this at varying frequencies, and store the data that was sent out over those different media. Then do a bit-by-bit comparison to the original data in the M4Ks... make sense?

So I am going to have to drive signals over twisted pair and coax too for example... I need some way to send different amounts of currents and voltages for these wires... and differential signaling etc... But right now I am investigating problems with higher frequencies...

What did you think about the SN74ABT125 for a buffer type of device, interfacing with all the line drivers for the different line media?