cancel
Showing results for 
Show  only  | Search instead for 
Did you mean: 
Anonymous
Not applicable
3,068 Views

A Question Regarding the Real Time Window Monitoring

In Application Note XAPP860 (16-Channel, DDR LVDS Interface with Real-Time Window Monitoring), Page 9, the bottom paragaph.

"However, the implementation of the window-monitoring circuit places a restriction on the serialization ratios that can be used. 6:1 is the highest serialization factor that can be used in conjunction with the circuit described in this application note. To achieve serialization factors such as 8:1 or 10:1, both a master and slave SERDES are required. However, the window-monitoring circuit depends upon using the slave ISERDES as a "mirror" of the master ISERDES, thereby rendering it unavailable to do the higher serializations.";

My questione is, what is the major concern if a third ISERDS (other than the Master and Slave described above) is used as the monitor?

For serialization ratio higher than 6:1, how can I achieve real-time monitoring?

Thanks.
0 Kudos
Reply
1 Reply
Xilinx Employee
Xilinx Employee
3,022 Views
Registered: ‎02-20-2008

Hello.

 

The main concern would be that you would face "some difficulty" in routing such a design. There is no direct routing-path from a group of two ISERDESes to a third one. 

 

==> For real-time window monitoring the 6:1 deserialisation is the maximum.

 

Cheers,

 

M.

0 Kudos
Reply