07-28-2008 09:40 PM
when is completion streaming mode, is completions will continuous fall out of the ip? In other word, in a complition receiving process,between sof and eof ,the src_rdy_n signal will always assert or may dessert and stall the interface?
07-29-2008 06:38 AM
Completion streaming mode priortizes completions and will promote completions over P/NP packets. This mode is required when configuring the core in a x8 at 250MHz or x4 at 125MHz interface frequency and when the EP will be receiving a stream of completions. Completions must be promoted to guarantee the completion buffer within the core does not overflow.
When receiving completions, the application is prohibited from de-asserting trn_rdst_rdy_n and must drain packets out of the core if packet exist. The application must qualify a data beat using trn_rsrc_rdy_n.
07-29-2008 07:59 PM
thank you for you answer!
I also want to how when a completion packet will drained out of the core. for example, the core receiving a 64bytes completion and i always assert trn_rdst_rdy_n , will the 64bytes completion drained out continuously or may stalled by the core throuth assert trn_rsrc_rdy_n?
In other words, when i always assert trn_rdst_rdy_n，in an completion receiving process between the core assert trn_rsof_n and trn_reof_n,the core will always assert trn_rsrc_rdy_n or may deassert it between the middle?
my englishi is poor ,i hope i have expressed my problem clearly, thank you !