SMSC LAN9420 - Manual (Page 108)

Single-Chip Ethernet Controller with HP Auto-MDIX Support and PCI Interface
Datasheet
Revision 1.22 (09-25-08) 108 SMSC LAN9420/LAN9420i
DATASHEET
4.3.5 Transmit List Base Address Register (TX_BASE_ADDR)
This register specifies the start address of the transmit buffer list. TX_BASE_ADDR must be 4-DWORD
(16 byte) aligned (e.g. Reserved address bits 3:0 must be 0).
Offset: 0010h Size: 32 bits
BITS DESCRIPTION TYPE DEFAULT
31:4 Start of Transmit List (STL)
This field points to the start of the transmit buffer descriptor list. The
descriptor list resides in the Host memory. Writing this register is only valid
when the TX DMA engine is in the stopped state. When stopped, this
register must be written before the START command is given. R/W 28‘h0
3:0 RESERVED RO -