Forum Discussion

ee60001's avatar
ee60001
Icon for New Contributor rankNew Contributor
5 years ago

How can I improve jtag to avalon master bridge write speeds through system console?

I am currently using system console to write to various PIO addresses of varying width and I am seeing that it takes system console ~3ms to write to a single mm address before it can start the write to another.

I am writing to different addresses and there isn't always a consistent sequence of addresses so I don't think I can just use the Avalon ST. What is the best way I can improve my write speed to the FPGA?

3 Replies

  • SyafieqS's avatar
    SyafieqS
    Icon for Super Contributor rankSuper Contributor
    5 years ago

    Hi Sean,


    Can you show me how did you see the time result? Any snapshot would be good


    • ee60001's avatar
      ee60001
      Icon for New Contributor rankNew Contributor
      5 years ago

      I just take the number of ticks between commands.

      master_write_8 $c_path $a 0x05
      set t1 [expr [clock microseconds]]
      master_write_32 $c_path $b $addr
      set t2 [expr [clock microseconds]]
      master_write_32 $c_path $c 0x00000000
      set t3 [expr [clock microseconds]]
      master_write_8 $c_path $d 0x0001
      set t4 [expr [clock microseconds]]
      master_write_8 $c_path $e 0x0000
      set t5 [expr [clock microseconds]]

      puts "[expr $t2-$t1]us"
      puts "[expr $t3-$t2]us"
      puts "[expr $t4-$t3]us"
      puts "[expr $t5-$t4]us"
  • SyafieqS's avatar
    SyafieqS
    Icon for Super Contributor rankSuper Contributor
    5 years ago

    Hi Sean,


    Noted. Unfortunately there is no method to speed up the system console.