SMSC LAN9420 - Manual (Page 117)

Single-Chip Ethernet Controller with HP Auto-MDIX Support and PCI Interface
Datasheet
SMSC LAN9420/LAN9420i 117 Revision 1.22 (09-25-08)
DATASHEET
4.3.11 Current Receive Buffer Address Register (RX_BUFF_ADDR)
This register points to the current receive buffer address being read by the DMAC.
Offset: 0054h Size: 32 bits
BITS DESCRIPTION TYPE DEFAULT
31:0 RX_BUFF_ADDR
This field contains the pointer to the current buffer address pointer used by
the DMAC during RX operation. RO 32‘h0