PIUPB
tpx0 = vrpiu_buf_read(sc, PIUPB(page, 0));
tpx1 = vrpiu_buf_read(sc, PIUPB(page, 1));
tpy0 = vrpiu_buf_read(sc, PIUPB(page, 2));
tpy1 = vrpiu_buf_read(sc, PIUPB(page, 3));
vrpiu_buf_read(sc, PIUPB(page, i));