SOPC Avalon Timing

[Altera_Forum]

Hi , 

 When I add a component to my system using SOPC Builder , I am not sure of what values I should enter for Avalon Timing (Setup , Read Wait , Write Wait , Hold , Read latency).  How can I determine the exact values for these parameters ?  Thank you,  Quan

[Altera_Forum]

hello quan1328 

 first it depends if it's an external component. if yes, then you must have a look into the datasheet and timing  for this component.  if it is an internal component, then you determine the timing with your  vhdl or verilog code. for internal components, i use the waitrequest avalon signal to handle  the timing. then you don't have to enter the avalon timing values. e.g. reading a register from an internal component requires e.g. 1 clock cycle, while reading from a fifo or other ram component normally needs 2 or 3  clock cycles.  see 3.2.2 Slave Read Transfer, Wait states  http://altera.com/literature/manual/mnl_avalon_spec.pdf (http://altera.com/literature/manual/mnl_avalon_spec.pdf)

[Altera_Forum]

--- Quote Start ---  originally posted by fischer@Aug 17 2006, 11:32 PM hello quan1328  first it depends if it&#39;s an external component. if yes, then you must have a look into the datasheet and timing  for this component.  if it is an internal component, then you determine the timing with your  vhdl or verilog code. for internal components, i use the waitrequest avalon signal to handle  the timing. then you don&#39;t have to enter the avalon timing values. e.g. reading a register from an internal component requires e.g. 1 clock cycle, while reading from a fifo or other ram component normally needs 2 or 3  clock cycles.  see 3.2.2 slave read transfer, wait states  http://altera.com/literature/manual/mnl_avalon_spec.pdf (http://altera.com/literature/manual/mnl_avalon_spec.pdf) <div align='right'><{post_snapback}> (index.php?act=findpost&pid=17685)  --- quote end ---    --- Quote End ---    Hi Fischer,  I am reading the pdf you suggested .  Thank you very much,  Quan