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?