SMSC LAN9311 User Manual

Two Port 10/100 Managed Ethernet Switch with 16-Bit Non-PCI CPU Interface

Revision 1.4 (08-19-08)

272

SMSC LAN9311/LAN9311i

 

This read/write register establishes the RX and TX operation modes and controls for address filtering
and packet filtering. Refer to 

 for additional information.

Bits 19-15, 13, and 11 determine if the Host MAC accepts the packets from the switch fabric. The
switch fabric address table and configuration determine which packets get sent to the Host MAC.

Offset:

1h

Size:

32 bits

31

Receive All Mode (RXALL)
When set, all incoming packets will be received and passed on to the 
address filtering function for processing of the selected filtering mode on the 
received frame. Address filtering then occurs and is reported in Receive 
Status. When cleared, only frames that pass Destination Address filtering 
will be sent to the application.

R/W

0b

30:24

RO

-

23

Disable Receive Own (RCVOWN)
When set, the Host MAC disables the reception of frames when TXEN (bit 
3) is asserted. The Host MAC blocks the transmitted frame on the receive 
path. When cleared, the Host MAC receives all packets, including those 
transmitted by the Host MAC. This bit should be cleared when the Full 
Duplex Mode bit is set.

R/W

0b

22

RO

-

21

Loopback operation Mode (LOOPBK)
Selects the loop back operation modes for the Host MAC. This field is only 
valid for full duplex mode. In internal loopback mode, the TX frame is 
received by the internal MII interface, and sent back to the Host MAC 
without being sent to the switch fabric.

When enabling or disabling the loopback mode it can take up to 
10

μs for the mode change to occur. The transmitter and receiver 

must be stopped and disabled when modifying the LOOPBK bit. 
The transmitter or receiver should not be enabled within10

μs of 

modifying the LOOPBK bit.

R/W

0b

20

Full Duplex Mode (FDPX)
When set, the Host MAC operates in Full-Duplex mode, in which it can 
transmit and receive simultaneously.

R/W

0b

19

Pass All Multicast (MCPAS)
When set, indicates that all incoming frames with a Multicast destination 
address (first bit in the destination address field is 1) are received. Incoming 
frames with physical address (Individual Address/Unicast) destinations are 
filtered and received only if the address matches the Host MAC Address.

R/W

0b

18

Promiscuous Mode (PRMS)
When set, indicates that any incoming frame is received regardless of its 
destination address.

R/W

1b

17

Inverse filtering (INVFILT)
When set, the address check function operates in inverse filtering mode. 
This is valid only during Perfect filtering mode. Refer to 

 for additional information.

R/W

0b