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Hi
I create a DDR2 High Performance Controller V7.1 with a stratix II device and find that the auto-generated SDC file include many constraints, such as DQ/DQS/Addr/Cmd output delay, DQ input delay, clock max delay, false path,etc. But When I create the same controller with a stratix III device, the auto-generated SDC file doesn't include DQ/DQS output delay, DQ input delay, clock max delay. It only includes Addr/Cmd output delay and less false paths. I have two questions: 1. Why there are so many differences between stratix II and stratix III? 2. Should I add the DQ/DQS output delay and DQ input delay and the others into SDC file when I use TimeQuest to analyze timing with DDR2 High Performance Controller in stratix III? If someone knows about it, please tell me. ThanksLink Copied
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Hello,
Sorry, I can give you my advice, because I use Stratix II only. But I think you are profession in my issues, I need your help. I have some troubles with my design. I use MegaWizard in Quartus's Web edition(not create High performance Controller), to create ALTMEMPHY. It releases many files such as: *_alt_mem_phy_reconfig_sii *_alt_mem_phy_ sii alt_mem_phy_defines alt_mem_phy_sequencer.vhd *_altmem_phy_sequencer_wrapper.vo ... Module "alt_mem_phy_sequencer.vhd" is encrypted, so I can't see anything. How can I use this module? To ensure my logic is ok, I simulate them with my logic by using NCverilog 5.5. But the way ALTMEMPHY tool uses parameter is new to me. And when I run my simulation, it can not stop and print out may warnings. So you can give me your advice. I'm very impressed by ALTMEMPHY but I can't use it for a long time. Thank you in advance!- Mark as New
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--- Quote Start --- Hi I create a DDR2 High Performance Controller V7.1 with a stratix II device and find that the auto-generated SDC file include many constraints, such as DQ/DQS/Addr/Cmd output delay, DQ input delay, clock max delay, false path,etc. But When I create the same controller with a stratix III device, the auto-generated SDC file doesn't include DQ/DQS output delay, DQ input delay, clock max delay. It only includes Addr/Cmd output delay and less false paths. I have two questions: 1. Why there are so many differences between stratix II and stratix III? 2. Should I add the DQ/DQS output delay and DQ input delay and the others into SDC file when I use TimeQuest to analyze timing with DDR2 High Performance Controller in stratix III? If someone knows about it, please tell me. Thanks --- Quote End --- HI shsong , can you provide your ddr2 controller sdc file for reference? regards --sampath
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