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CycloneII, input pins TTL-friendly

Altera_Forum
Honored Contributor II
‎08-30-2010 07:11 PM
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Hello @ All, 

I am in a position to connect TTL-level signals to the CycloneII. With reference to my Thread, May 15th, Realization MFM de/en-Coder via MAXII, 

I was using successfully 270 Ohm resistors to cconnect the TTL signals to the MAXII. In the meantime I have bougth the DE1-board, based on a CycloneII FPGA. Is this method still practicable? Are the CycloneII inputs still "TTL-friendly" or is a level converter necessary ? Any inputs, solutions or references are welcome. Many thanks in advance, Reinhard
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