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hi,
I have a question of io timing constraints of (r)gmii signals of Altera's triple speed ethernet MAC core. Within the tcl/sdc constraint file generated by megawizard, I cannot find the setup/hold timing constraints of the (r)gmii signals. Only the fast input/output register constraints like below "" set_instance_assignment -name FAST_INPUT_REGISTER ON -to gm_rx_d set_instance_assignment -name FAST_INPUT_REGISTER ON -to gm_rx_dv # Optimize I/O timing for MII network-side interface set_instance_assignment -name FAST_INPUT_REGISTER ON -to m_rx_col ... " Altera support said it should be ok. But I still doubt if the constraints above enough for the (r)gmii signals. Actually I have meet a case before that the design function did not work correctly because of the timing of the status signals of Altera SPI4 core. The timing violation did not show up in the classic timing analysis, but reported manually with TimeQuest tools. Again there is no io timing constaints for SPI4 signal. does anyone have idea of this? Thanks,Link Copied
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Did you get an answer on the Ethernet MII?
What Ethernet PHY are you using? The Ethernet PHY will have detailed setup/hold time on the MII interface including the MDIO/MCD serial control.- Mark as New
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hi,
We use marvell phy. I understand that there are detailed timing parameter in marvell spec. But I quite want to get the references of their IP from altera. I hope the IP should at least include simple example of pin assignment, timing constraints. regards,
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