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yangbay81983
Joined: 20 Jun 2008
Posts: 3
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 25 Jun 2008 9:39 Constraints on output ports and something about AMBA |
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Hi,
when we make a sub-ip specification for DRAM controller before our RTL design, how to evaluate and add constraints on output ports who will be connected to SDRAM, Thanks! for example, set_load=?
Another question is the result of synthesis of AHB bus. Does it contain only Arbiter and Decoder? Once again, Thanks!
Yang
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lakshman.ar
Joined: 29 Nov 2006
Posts: 86
Helped: 8
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| 25 Jun 2008 9:58 Constraints on output ports and something about AMBA |
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| Normally 30% of the clock is specifed as the output delay.
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yangbay81983
Joined: 20 Jun 2008
Posts: 3
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| 25 Jun 2008 10:23 Re: Constraints on output ports and something about AMBA |
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| lakshman.ar wrote: |
| Normally 30% of the clock is specifed as the output delay. |
This 30% is special for ports for I/O? and other output delay should be calculated, is that right? Thanks
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yangbay81983
Joined: 20 Jun 2008
Posts: 3
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| 26 Jun 2008 2:46 Constraints on output ports and something about AMBA |
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| Could Anybody answer my question: how to add input/output delay constraints on input/output ports of IP who connect external environments ? Thanks
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ljxpjpjljx
Joined: 05 May 2008
Posts: 122
Helped: 2
Location: Shang Hai
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| 26 Jun 2008 3:36 Re: Constraints on output ports and something about AMBA |
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| I thinks you should refer the SPEC to see the dealy requirement and consult with IP owner!
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lakshman.ar
Joined: 29 Nov 2006
Posts: 86
Helped: 8
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| 26 Jun 2008 5:45 Constraints on output ports and something about AMBA |
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FOA if u have bought the IP frm some1 els, u cannot specify a input/output delay on those ports !
U have to consult the person who designed tht IP !
ur question : "Could Anybody answer my question: how to add input/output delay constraints on input/output ports of IP who connect external environments ?"
Please elaborate as to what it ur requirement, do u want to add a i/o delay constraints to the ports of IP ?
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