Is there four (4) prongs to establishing a Brady claim?

QUESTION(S) PRESENTED Is their four (4) prongs to establishing a Brady claim ? . Is the burden on the defense to’ scavage for Brady material to show due diligence ? Is a Brady violation one of timelyness ? “If a prosecuting attorney agrees to dismiss remaining charges with a star witness that is apart of a plea agreement, do they have to turn that information over ? If a prosecuting attorney agrees to dismiss remaining charges should that information be within the frame work of the plea agreement ? Did the PCRA Court Abuse it's discression when they failed to address the issue raised before them ?° Did the Appellate Court Abuse it's discression when they ruled that they would not remand: to the PCRA Court for correction, and when they ruled that the issue was previously litigated ? Is a issue that was raised, but the merits of the claim was never ruled upon, is it deemed previously litigated ? . . ; “ dii ee z