Single-Chip Ethernet Controller with HP Auto-MDIX Support and PCI Interface

Datasheet

4.3.3Receive Poll Demand Register (RX_POLL_DEMAND)

 

Offset:

0008h

Size:

32 bits

 

 

This register enables the RX DMAC to check for new descriptors.

 

 

 

 

 

 

 

 

BITS

 

DESCRIPTION

 

 

TYPE

DEFAULT

 

 

 

 

 

 

31:0

Receive Poll Demand (RPD)

 

 

WO

-

 

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.

 

 

 

 

 

 

 

 

 

 

 

 

Revision 1.22 (09-25-08)

106

SMSC LAN9420/LAN9420i

 

DATASHEET