ED_TXBUF_SIZE
((sc->txb_cnt * ED_TXBUF_SIZE) << ED_PAGE_SHIFT);
sc->txb_next_tx * ED_TXBUF_SIZE);
((sc->txb_new * ED_TXBUF_SIZE) << ED_PAGE_SHIFT);
sc->rec_page_start = sc->tx_page_start + sc->txb_cnt * ED_TXBUF_SIZE;
sc->rec_page_start = sc->tx_page_start + ED_TXBUF_SIZE;
(ED_TXBUF_SIZE << ED_PAGE_SHIFT);