Subversion Repositories gecko3

Last modification

• Rev 28 2010-02-25 19:10:10 GMT
• Author: nussgipfel

• Log message:

  switched to work on the v1 production GECKO3main. the timing is a big issue
  with the prototype system. the cabeling and the possibly bad influence of the
  prototype board layout makes it impossible to run this core in sync with the
  host transfers.
  
  out transfer is fully working. always in sync with the transfers and reads all
  tmc headers correctly.
  
  abort handling in the core works as well. there were some fixes needed in the
  firmware, not all IN FIFO buffer where flushed.
  
  a lot of work was done for the IN transfer (fpga to pc). the in transfer
  handling in GECKO3COM_simple_test.vhd is finished.
  
  the GECKO3COM_simple_datapath/fsm is finished.
  
  there is still an issue left but I think the problem is in the gpif_com
  module. for long IN transfers, we still not receive the correct number of bytes.
  
  it works great for all sort of short transfers.
  
  
  Here I present a time measurement to show the achieved message throughput:
  (Response message was 1 byte, total with header and align bytes was 16 byte)
  
  time for i in {0..100000}; do cat /dev/usbtmc1 > /dev/null; done
  
  real 5m45.706s
  user 0m27.498s
  sys 4m52.676s
  
  This shows that we can read data from the fpga with a rate up to 290 Hz