TCU QB Trevone Boykin -- Arrested For Belting Cop Update: Arrest Pic

4:30 PM PST -- TMZ Sports has obtained a pic of Trevone Boykin laying on the sidewalk after being detained by cops. By our count, at least 7 cops were on scene to handle the situation.

One witness at the scene tells us Boykin didn't appear in his right mind -- adding "He was trying to go to war with everyone."

TCU QB Trevone Boykin was arrested Thursday morning after a bar fight where its alleged he struck a police officer ... and has been suspended for Friday's Alamo Bowl against Oregon.

Reports say Boykin got into an altercation in a San Antonio bar after being heckled by patrons ... and when cops showed up to restore order he popped an officer.

Boykin was arrested and charged with assault on a public official, resisting arrest, and public intoxication.

Story developing ...