LAN9250 datasheet(193/421 Pages) MICROCHIP

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DS00001913A-page 193

LAN9250

11.15.1

HOST MAC CONTROL REGISTER (HMAC_CR)

This read/write register establishes the RX and TX operation modes and controls for address filtering and packet filter-

ing.

Offset:

01h

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 Sta-

tus. When cleared, only frames that pass Destination Address filtering will be

sent to the application.

R/W

30:26

RESERVED

Host MAC Energy Efficient Ethernet (HMAC_EEE_ENABLE)

When set, this bit enables EEE operation (both TX LPI and RX LPI)

R/W

Note 7

RESERVED

Disable Receive Own (RCVOWN)

When set, the Host MAC disables the reception of frames when it is transmit-

ting (TXEN output is asserted). When cleared, the Host MAC receives all

packets, including those transmitted by the Host MAC. This bit has no effect

when the Full Duplex Mode (FDPX) bit is set.

R/W

RESERVED

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 network.

0: Normal Operation. Loopback disabled.

1: Loopback enabled

Note:

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

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.

R/W

Full Duplex Mode (FDPX)

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

mit 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 Host MAC Address.

R/W

Promiscuous Mode (PRMS)

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

destination address.

R/W

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