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AR# 47894

LogiCORE IP Ten Gigabit Ethernet PCS/PMA v2.3 (10GBASE-R/KR) - Kintex-7 Devices - BUFH may need to drive MMCM input

Description

When targeting a Kintex-7 device, it might not be possible to place the MMCM in such a way that it can be driven directly by the output from an IBUFDS_GTE2.


Solution

The solution is to connect the output from the existing BUFH in the core block level to the MMCM CLKIN1 input instead of using the output from the IBUFDS_GTE2 directly.  

In the core_name_block.v/vhd file, change the MMCM CLKIN1 input from:
 

CLKIN1   => q1_clk0_refclk_i,


to
 

CLKIN1   => q1_clk0_refclk_i_bufh,


AR# 47894
Date Created 07/12/2012
Last Updated 11/06/2014
Status Active
Type General Article