Forum Discussion

Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
12 years ago

cyclone II decompression rbf

Does exists description how of decompressing (or compressing) algoritm wich is used in CYCLONE II with EPCS1 (active configuration)? I spent all day but searching, I found altera's patents but it doe...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
12 years ago

Hi Petr:

Although the compression algorithm used is probably one of the standard ones, I doubt it's published anywhere other than internal Altera Documents.. (FPGA manufacturers tend to keep the details of the bitstream proprietary)

It sounds like you are using a micro for in field updates. If that's the case, have you ever thought of just having the micro program the bitfile every bootup. (through either jtag or passive serial modes)

You can punt the EPCS1 then, and have bitfile just stored in the micro's flash.

Pete