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hi, i have a situation that 4 DSP processor integrated in the board. how to analyis the bus integrity and what topology to fix and the termination . regards binu g
Binu, This is a pretty open ended question. Basically you need to get the model for the DSP, associate that model to the device on the board, then extract the net into SigXP where you can do a lot of "what if" simulations to help determine the proper termination schemes, topology structures like star, daisychain, ... All of this is covered in the training course available for Allegro PCB SI. There are also some pretty good material available on this forum in the form of movies that will help describe this as well. Refer to the movies Drawing Simulations at the Board Level and webinar Archived Webinar: Signal Integrity at the Electrical Engineer Level both of which can be found in the Movies and Webinars section. Regards, John Horner
i get an error message "Electrical CSet "Link0" is invalid because : multiple parts are on the same node. all parts must be connected with T-lines Using SingXplorer to resolve." this is the error message i get, when i created a Electrical CSet with name "Link0" and tried to include the differential pair in this Electrical CSet. how i can resolve this. regards binu g
Binu, The message you have received is because the topology requires that active devices be connected with the tline object, and not directly connected together with the yellow connection lines. Look in the interconnect tab and add a Tline (or coupled tline for your diffpair) between the IC's.