• State Accepted Answer
  • +1 person also asked this people also asked this
  • Replies 2 replies
  • Subscribers 142 subscribers
  • Views 11154 views
  • Users 0 members are here
Options
Related
How was your experience today?

AHB Lite Multiple burst without idle transfer

Muthuvenkatesh

Hi All,

               Consider the following burst transfers.

1. INCR4 (WR) IDLE INCR4(RD)

2. INCR4 (WR) INCR4(RD)

3. INCR4 (WR - WR1 ,WR2, IDLE, WR3 ,WR4 )   INCR4(RD)

             All the above transactions are valid transfer or not .

Can we trigger multiple burst without giving idle transfer ?

Can we trigger IDLE transfer within the burst .

Thanks & Regards

Muthuvenkatesh

 

               

 

  • +1

    Hi Muthuvenkatesh

    I'm not too sure what your sequences are showing, so I'll explain what I think the sequences are, and then if they would be legal.

    1 - INCR4 (WR) IDLE INCR4(RD)

    This is HTRANS signalling NONSEQ-SEQ-SEQ-SEQ-IDLE-NONSEQ-SEQ-SEQ-SEQ, so 2 complete 4-beat bursts, with an IDLE in between.

    This would be legal (assuming HREADY is high for each transfer to keep things simple).

    2 - INCR4 (WR) INCR4(RD)

    The same sequence as above, but without the IDLE in between the 2 4-beat bursts.

    Again perfectly legal, there is no requirement to have an IDLE in between bursts.

    3 - INCR4 (WR - WR1 ,WR2, IDLE, WR3 ,WR4 )  INCR4(RD)

    This time HTRANS would be NONSEQ-SEQ-IDLE-SEQ-SEQ-NONSEQ-SEQ-SEQ-SEQ.

    This one is definitely illegal. An IDLE transfer can only happen outside of any burst, so it could not happen after the 2nd transfer of a 4-beat burst.

    If you need to stall a defined length burst you would instead use a BUSY transfer in place of the IDLE.

    I hope that was what you were describing.