LAN9500AI datasheet(159/213 Pages) MICROCHIP

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DS00001875A-page 159

LAN950x

7.4.1

MAC CONTROL REGISTER (MAC_CR)

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

Address:

100h

Size:

32 bits

Bits

Description

Type

Default

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.

R/W

30-24

RESERVED

Disable Receive Own (RCVOWN)

When set, the MAC disables the reception of frames when TXEN 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.

R/W

RESERVED

Loopback Operation Mode (LOOPBK)

Selects the loop back operation modes for the MAC. This is only for full

duplex mode

0 = Normal. No feedback

1 = 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

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

Full Duplex Mode (FDPX)

When set, the MAC operates in Full-Duplex mode, in which it can transmit

and receive simultaneously.

R/W

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.

R/W

Promiscuous Mode (PRMS)

When set, indicates that any incoming frame is received regardless of its

destination address.

R/W

Inverse filtering (INVFILT)

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

This is valid only during Perfect filtering mode.

R/W

Pass Bad Frames (PASSBAD)

When set, all incoming frames that passed address filtering are received,

including runt frames, collided frames or truncated frames caused by buffer

underrun.

R/W

Hash Only Filtering mode (HO)

When set, the address check Function operates in the imperfect address

filtering mode both for physical and multicast addresses.

R/W

RESERVED

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