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AR# 21884

LogiCORE 10 Gigabit Ethernet MAC - How is the core affected by the new DCM timing parameters on Virtex-4 devices? Is the DCM_STANDBY macro required?


General Description: 

When using the LogiCORE Ethernet 10 Gigabit Ethernet MAC Core in Virtex-4, DCMs are instantiated in the top-level wrapper. How do the new Virtex-4 timing parameters affect these DCMs? Is the DCM_STANDBY macro required?


Refer to (Xilinx Answer 21605) for details on how different Virtex-4 stepping levels affect your design when targeting Virtex-4 devices. 


For information on the new Virtex-4 timing parameters, see (Xilinx Answer 21127). Notice that the DCM_STANDBY macro is required to meet the DCM_INPUT_CLOCK_STOP and DCM_RESET requirements. The DCM_STANDBY macro can be manually instantiated or automatically inserted by ISE depending on the stepping level of the device that is being targeted as indicated in (Xilinx Answer 21605)


If it is determined that manual insertion of the macro is required, refer (Xilinx Answer 21127) for more information on how to use the macro.

AR# 21884
Date Created 09/04/2007
Last Updated 05/19/2014
Status Archive
Type General Article