It's as easy as setPageStart(0); setPageSize(totalNumberOfItems); (where totalNumberOfItems is actually the same value you'd pass to setRowCount).
E.g. given a List of items to be displayed:
table.setPageStart(0);
table.setPageSize(list.size());
table.setRowData(list); // which is equivalent to table.setRowCount(list.size()); table.setRowData(0, list);