LAN9220 datasheet(93/142 Pages) MICROCHIP

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DS00002417A-page 93

LAN9220

5.4.1

MAC_CR—MAC CONTROL REGISTER

This register establishes the RX and TX operation modes and controls for address filtering and packet filtering.

Offset:

Attribute:

R/W

Default Value:

00040000h

Size:

32 bits

Bits

Description

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 reset, only frames that pass Destination

Address filtering will be sent to the Application.

30-24

Reserved

Disable Receive Own (RCVOWN). When set, the MAC disables the reception of frames when the

MII TX_EN signal is asserted. The MAC blocks the transmitted frame on the receive path. When reset,

the MAC receives all packets the PHY gives, including those transmitted by the MAC.This bit should

be reset when the Full Duplex Mode bit is set.

Reserved

Loopback operation Mode (LOOPBK). Selects the loop back operation modes for the MAC. This is

only for full duplex mode

1’b0: Normal: No feedback

1’b1: Internal: Through MII

In internal loopback mode, the TX frame is received by the Internal MII interface, and sent back to

the MAC without being sent to the PHY.

Note:

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

s 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

s of modifying the

LOOPBK bit.

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

and receive simultaneously. In Full-Duplex mode, the heartbeat check is disabled and the heartbeat

fail status should thus be ignored.

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 MAC Address.

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

its destination address.

Inverse filtering (INVFILT). When set, the address check Function operates in Inverse filtering mode.

This is valid only during Perfect filtering mode.

Pass Bad Frames (PASSBAD). When set, all incoming frames that passed address filtering are

received, including runt frames and collided frames.

Hash Only Filtering mode (HO). When set, the address check Function operates in the Imperfect

Address Filtering mode both for physical and multicast addresses

Reserved

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