STNIC_WRITE
STNIC_WRITE (PG0_RSAR0, 0);
STNIC_WRITE (PG0_RSAR1, ring_page);
STNIC_WRITE (PG0_RBCR0, 4);
STNIC_WRITE (PG0_RBCR1, 0);
STNIC_WRITE (STNIC_CR, CR_RRD | CR_PG0 | CR_STA);
STNIC_WRITE (STNIC_CR, CR_RDMA | CR_PG0 | CR_STA);
STNIC_WRITE (PG0_RSAR0, offset & 0xff);
STNIC_WRITE (PG0_RSAR1, offset >> 8);
STNIC_WRITE (PG0_RBCR0, length & 0xff);
STNIC_WRITE (PG0_RBCR1, length >> 8);
STNIC_WRITE (STNIC_CR, CR_RRD | CR_PG0 | CR_STA);
STNIC_WRITE (STNIC_CR, CR_RDMA | CR_PG0 | CR_STA);
STNIC_WRITE (PG0_RBCR0, 1); /* Write non-zero value */
STNIC_WRITE (STNIC_CR, CR_RRD | CR_PG0 | CR_STA);
STNIC_WRITE (PG0_RBCR0, length & 0xff);
STNIC_WRITE (PG0_RBCR1, length >> 8);
STNIC_WRITE (PG0_RSAR0, 0);
STNIC_WRITE (PG0_RSAR1, output_page);
STNIC_WRITE (STNIC_CR, CR_RWR | CR_PG0 | CR_STA);
STNIC_WRITE (STNIC_CR, CR_RDMA | CR_PG0 | CR_STA);