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so anyone can tell to where to find the REAL working spec about the altera FPGA's JTAG programming?
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Unfortunately one does not exist. There are "hints" of the JTAG instructions and programming sequence in the JRunner software package, but nothing official.
Xilinx has done a much better job of specifying their programming protocols and providing tools.
As Alex points out, the "recommended" programming method for Altera FPGAs via a processor are the passive serial (PS) and fast passive parallel (FPP) modes, or you can use SPI to program an SPI flash, and then allow the FPGA to boot from that flash.
If you have no choice but to use JTAG (due to hardware limitations), then take a look at the JRunner software
https://www.altera.com/download/legacy/jrunner/dnl-jrunner.html Cheers,
Dave
Honored Contributor
