Compact subspaces of the space of separately continuous functions with the cross-uniform topology

We consider two natural topologies on the space S(X× Y,Z) of all separately continuous functions defined on the product of two topological spaces X and Y and ranged into a topological or metric space X. These topologies are the cross-open topology and the cross-uniform topology. We show that these topologies coincides if X and Y are pseudocompacts and Z is a metric space. We prove that a compact space K embeds into S(X× Y,Z) for infinite compacts X, Y and a metrizable space Z if and only if the weight of K is less than the sharp cellularity of both spaces X and Y.