San Francisco 49ers quarterback Alex Smith practices during an NFL football training camp in Santa Clara, Calif., Thursday, Aug. 2, 2012. (AP Photo/Jeff Chiu)

San Francisco 49ers quarterback Alex Smith, right, and running back Frank Gore practice during an NFL football training camp in Santa Clara, Calif., Thursday, Aug. 2, 2012. (AP Photo/Jeff Chiu)

San Francisco 49ers linebacker NaVorro Bowman practices at an NFL football training camp in Santa Clara, Calif., Thursday, Aug. 2, 2012. (AP Photo/Jeff Chiu)

San Francisco 49ers head coach Jim Harbaugh, right, talks with referees before practice at an NFL football training camp in Santa Clara, Calif., Thursday, Aug. 2, 2012. (AP Photo/Jeff Chiu)

San Francisco 49ers wide receiver Mario Manningham, right, practices with cornerback Carlos Rogers at an NFL football training camp in Santa Clara, Calif., Thursday, Aug. 2, 2012. (AP Photo/Jeff Chiu)

San Francisco 49ers head coach Jim Harbaugh yells during practice at an NFL football training camp in Santa Clara, Calif., Thursday, Aug. 2, 2012. (AP Photo/Jeff Chiu)

San Francisco 49ers defensive tackle Justin Smith gestures during practice at an NFL football training camp in Santa Clara, Calif., Thursday, Aug. 2, 2012. (AP Photo/Jeff Chiu)

San Francisco 49ers running back Brandon Jacobs kneels at practice at an NFL football training camp in Santa Clara, Calif., Thursday, Aug. 2, 2012. (AP Photo/Jeff Chiu)

San Francisco 49ers linebacker Patrick Willis practices at NFL football training camp in Santa Clara, Calif., Thursday, Aug. 2, 2012. (AP Photo/Jeff Chiu)

San Francisco 49ers general manager Trent Baalke, left, talks with offensive tackle Anthony Davis at an NFL football training camp in Santa Clara, Calif., Thursday, Aug. 2, 2012. (AP Photo/Jeff Chiu)

San Francisco 49ers tight end Vernon Davis practices at an NFL football training camp in Santa Clara, Calif., Thursday, Aug. 2, 2012. (AP Photo/Jeff Chiu)

San Francisco 49ers wide receiver Kyle Williams walks by an NFL football news conference at the team's headquarters in Santa Clara, Calif., Thursday, July 26, 2012. (AP Photo/Paul Sakuma)

San Francisco 49ers quarterback Alex Smith smiles during a news conference at NFL football headquarters in Santa Clara, Calif., Friday, July 27, 2012. (AP Photo/Paul Sakuma)

San Francisco 49ers head coach Jim Harbaugh smiles during a news conference at 49ers NFL football headquarters in Santa Clara, Calif., Friday, July 27, 2012. (AP Photo/Paul Sakuma)

San Francisco 49ers linebacker Aldon Smith speaks during a news conference at NFL football headquarters in Santa Clara, Calif., Friday, July 27, 2012. In his first public comments since he was stabbed at his home last month, Smith said Friday that "letting everybody down was probably the saddest part." He also was charged in late January with driving under the influence in Miami Beach. (AP Photo/Paul Sakuma)

San Francisco 49ers head coach Jim Harbaugh gestures during a news conference at 49ers NFL football headquarters in Santa Clara, Calif., Friday, July 27, 2012. (AP Photo/Paul Sakuma)

San Francisco 49ers linebacker Aldon Smith walks away from a news conference at the NFL football team's headquarters in Santa Clara, Calif., Friday, July 27, 2012. Smith was stabbed at his home last month. He was also charged with driving under the influence in Miami in late January. (AP Photo/Paul Sakuma)

San Francisco 49ers wide receiver Randy Moss smiles during a news conference at NFL football headquarters in Santa Clara, Calif., Friday, July 27, 2012. (AP Photo/Paul Sakuma)