  In this short note, we show that the Ginzburg-Vasserot map between the
quantum affine algebra of type A_(n-1) and the equivariant K-theory group of
the Steinberg Variety (of n-step flags in C^d) restricts and remains surjective
at the level of the integral forms. In particular, this shows that the
parametrization of irreducible, finite-dimensional modules and the
Kazhdan-Lusztig multiplicity formulas are valid for the (restricted)
specialization at roots of unity.
