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AR# 23202

LogiCORE XAUI v6.1 Core - CHAN_BOND_LIMIT value on GT11s is incorrect

Description

When the XAUI v6.1 Core example design files are generated in Core Generator, CHAN_BOND_LIMIT is currently set to 31 on all GT11s. This should be reduced to 7 to meet requirements. The current setting of 31 is outside the 802.3ae spec. The setting of 31 also means that the CLK_COR_MIN_LAT and MAX_LAT settings are outside the parameters set in the GT11 User Guide.

Solution

Changing to 7 will resolve this problem. This will involve changing the "transceivers.v/vhd" file in the example design.  

 

In the verilog file, change the line "synthesis attribute CHAN_BOND_LIMIT of GT11" from "31" to "7", and the same for the defparams (there are 4 instances of each of these). 

 

In the vhdl file, change the CHAN_BOND_LIMIT generic from 31 to 7 (there are 4 instances of this as well).

AR# 23202
Date Created 09/04/2007
Last Updated 05/20/2014
Status Archive
Type General Article