Madden NFL 97 is the first Madden NFL football game to be created in the 32-bit gaming era. It was originally created for the PlayStation and Sega Saturn, but other versions were also released.
This was the first edition of Madden to implement the use of a salary cap when customizing team rosters. It also featured the new Baltimore Ravens, the expansion franchise that absorbed the roster of the Cleveland Browns for the 1996 season. The game also adds a team of real free agents which can be traded and added to other teams' rosters, and could be played by using a cheat code.
Classic teams were once again used, although most were different from the previous year's teams; the years ranged as far back as 1952 (Detroit Lions) and as recent as 1990 (Buffalo Bills). Jacksonville and Carolina, once again, did not get classic teams, but Baltimore was attached to a classic Cleveland Browns team.
Source: Wikipedia, "Madden NFL 97," available under the CC-BY-SA License.