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Altera_Forum's avatar
Altera_Forum
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13 years ago

problem of configuring two different FPGAs

My board has two FPGAs (both EP3C16E144I7) designed to be programmed with Active Serial and JTAG. It is working fine. I can program the two FPGAs through JTAG with sof and jic, or through AS flash in...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
13 years ago

There is no problem when mixing FPGAs. I regularly have JTAG chains with MAX II devices and Stratix devices. My new board will mix MAX II, Cyclone IV, and Stratix IV.

The main thing you have to be careful of is buffering TCK/TMS so that each FPGA gets its own copy.

Zoom in to the JTAG TCK waveform very closely and see if the edges are monotonic, with no dips.

Cheers,

Dave