User manual

Selecting the I/O standard
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The Altera FPGA IO blocks support use of a number of logic
drive/receiver standards.
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These are generally selected per IO block. All pins in a given
block must use the same standard.
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The standards supported will vary between logic families.
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For the DE2-70 the default (which is?) has proven adequate
for most cases.
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If changes are needed to a .qsf file, make a copy of the
supplied file, rename it to the current project and make the
desired changes. Modifying the standard file without
renaming (and commenting the changes) likely will have
undesired and unexpected consequences at some future time.
EECS 452 – Fall 2014 Lecture 5 – Page 41/143 Tuesday – September 16, 2014