Millwall overcame Blackburn in a quarter-final replay at Ewood Park last week and will now take on Wigan on Saturday, April 13 for a place in the FA Cup Final.
"It would be a fantastic experience, it's a massive game and hopefully I'll now keep my place in the team and get to start," Smith told the Spurs website.
"There are a lot games between now and then, so I'll have to maintain my form.
"You have ups and downs in football, I've had a bit of a down being of the starting 11 in the last couple of matches but I got my chance early on Saturday, and now I'm up again.
"It's a special occasion, a semi-final at Wembley, you don't need to say any more than that really."