There is extended information provided in the attached document. it contains detailed description "how-to", example design, detailed memory maps and code examples.
Also tested example projects created under CodeWarrior are attached.
I believe the document as well as SW examples will help you in the design and avoid mistakes we have met under our work in the S12(X) support team.
Original Attachment has been moved to: AN-ExBUS-AddendumToAN2708-v.0.2.zip
Original Attachment has been moved to: XEP100-EXRAM--MR2A16ACYS35-CS1-CW51.ZIP
Original Attachment has been moved to: XDP512---EXRAM-256x16---CS0---CW47.zip