ED_TXBUF_SIZE
(((dsc->txb_cnt + 1) * ED_TXBUF_SIZE ) <<
(dsc->txb_cnt + 1) * ED_TXBUF_SIZE;
rec_page_start = TX_PAGE_START + ED_TXBUF_SIZE;
sc->rec_page_start = sc->tx_page_start + sc->txb_cnt * ED_TXBUF_SIZE;
((sc->txb_cnt * ED_TXBUF_SIZE) << ED_PAGE_SHIFT);
sc->tx_page_start + sc->txb_next_tx * ED_TXBUF_SIZE);
((sc->txb_new * ED_TXBUF_SIZE) << ED_PAGE_SHIFT);
sc->rec_page_start = sc->tx_page_start + ED_TXBUF_SIZE;
(ED_TXBUF_SIZE << ED_PAGE_SHIFT);