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TM4C1230D5PM: Ordering code confusion: I7R suffix

Part Number: TM4C1230D5PM

I want to source some TM4C1230D5PM parts, but the distributor lists TM4C1230D5PMI7R order code.

Please clarify, what is the difference between this variant and TM4C1230D5MPI which is listed in most other places? Is it some older silicon revision?