AM6442: OSPI trace routing while connecting onto two devices

Hello Rich, 

Please refer below comments.

Please note that there are signal integrity issues that must be considered when attaching multiple devices. The data transfer rate can be reduced to allow time for the data signals to settle, but attaching a single clock signal to multiple devices is problematic.

 It is not possible to distribute a single clock to multiple devices via fly-by topology without the risk of producing internal glitches on any device connected in the middle of the clock signal trace even if connected without creating stubs.  It may be possible to minimize this concern by using a T topology, but it must be implemented properly and verified using signal integrity simulations. 

The best way is to ensure there are no clocking issues is to insert a 1:n clock buffer in the clock signal path, which introduces significant delay and reduces the data transfer rates for the entire interface. 

In my opinion, the only way to reliably achieve the data transfer rates wanted for this interface is to limit the connectivity options to a single external memory device with point to point connections.

 Regards,

Sreenivasa

Hello Rich,

I have not heard from you and closing the thread.

Regards,

Sreenivasa