LAN9420 Datasheet, PDF (107/171 Pages) SMSC Corporation – Single-Chip Ethernet Controller with HP Auto-MDIX Support and PCI Interface

Single-Chip Ethernet Controller with HP Auto-MDIX Support and PCI Interface
Datasheet
4.3.3 Receive Poll Demand Register (RX_POLL_DEMAND)
Offset:
0008h
Size:
32 bits
This register enables the RX DMAC to check for new descriptors.
BITS
31:0
DESCRIPTION
Receive Poll Demand (RPD)
When written with any value, the DMAC will check for receive descriptors.
If no descriptors are available, the receive process returns to the suspended
state and bit 7 of the DMAC_STATUS register (receive buffer unavailable -
RU) is not set. A write to this register is only effective if the receive process
is in the suspended state. A Read of this register will timeout and invalid
data will be returned.
TYPE
WO
DEFAULT
-
SMSC LAN9420/LAN9420i
107
DATASHEET
Revision 1.6 (07-18-11)