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AR# 21356

Virtex-II Pro-X, Virtex-4 RocketIO - The V-4 MGT does not channel bond? Why?

Description

The Virtex-4 MGT does not channel bond? Why is this the case?

Solution

One reason channel bonding will not work concerns how the CHAN_BOND_SEQ_x_MASK and the CHAN_BOND_SEQ_LEN are set. CHAN_BOND_SEQ_x_MASK and CHAN_BOND_SEQ_LEN have to match up; otherwise, channel bonding will not occur. 

 

For example, if the channel bond sequence is a single byte symbol: 

 

CHANNEL BOND WORKING EXAMPLE 

CHAN_BOND_SEQ_x_MASK => "1011" -- Only single byte mask. Note single byte does not have to be in fixed position as long as it is only single byte 

CHAN_BOND_SEQ_LEN => 1 

 

CHANNEL BOND NOT WORKING EXAMPLE 

CHAN_BOND_SEQ_x_MASK => "0000" -- Multiple byte mask when sequence length is only 1. 

CHAN_BOND_SEQ_LEN => 1

AR# 21356
Date Created 09/04/2007
Last Updated 05/19/2014
Status Archive
Type General Article