"I made a mistake and I'm just trying to gain the trust back from my coaches, my teammates and Auburn's fans," Marshall told reporters, according to ESPN.com's Greg Ostendorf. "I'm just going to accept my punishment with open hands.
"The incident that happened is just going to change me and make [me] a better man."
Auburn coach Gus Malzahn has said Marshall won't start the team's opener against Arkansas, but didn't say how long he will hold the senior out. The 22-year-old said he had a "man-to-man conversation" with Malzahn.
Marshall threw for 1,976 yards with 14 touchdowns and six interceptions last season, as the Tigers advanced to the BCS Championship Game. He also rushed for 1,068 yards and 12 touchdowns.
- Chris Mascaro