SMSC LAN9420 - Manual (Page 116)

Single-Chip Ethernet Controller with HP Auto-MDIX Support and PCI Interface
Datasheet
Revision 1.22 (09-25-08) 116 SMSC LAN9420/LAN9420i
DATASHEET
4.3.10 Current Transmit Buffer Address Register (TX_BUFF_ADDR)
This register points to the current transmit buffer address being read by the DMAC.
Offset: 0050h Size: 32 bits
BITS DESCRIPTION TYPE DEFAULT
31:0 TX_BUFF_ADDR
This field contains the pointer to the current buffer address pointer used by
the DMAC during TX operation. RO 32‘h0