10-20-2015 11:20 PM
Hi! I'm designing a board with kintex 7. I decided to use BPI NOR flash for configuration in synchronous mode. As shown in KC705 Ev. board schematic there is a reserved place for AC termination (parallel connection of a resistor in series with a capacitor) of CCLK line. AR 41782 says that ringing was fixed in 7 series. I'm a bit confused about the reason of reserving place for R and C on the CCLK line.
As for me, AC termination of CCLK line is needed when the length of the line is rather long. If the trace is relatively short ( for example < 5 inches) there is no need of termination. Correct me, if i'm wrong.
And one more question, is it ok to use BPI NOR flash in asynchronous mode for updating multiboot image ("update bitstream") after configuration? I mean remote programming (when we send bitstream via ethernet and fpga programm its own flash)
10-21-2015 02:15 AM
10-27-2015 05:24 AM