LAN9250 datasheet(194/421 Pages) MICROCHIP

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LAN9250

DS00001913A-page 194

 2015 Microchip Technology Inc.

Inverse filtering (INVFILT)

When set, the address check function operates in inverse filtering mode. This

is valid only during Perfect filtering mode. Refer to Section 11.4.4, "Inverse

Filtering," on page 143 for additional information.

R/W

Pass Bad Frames (PASSBAD)

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

including runt frames and collided frames. Refer to Section 11.4, "Address

Filtering," on page 142 for additional information.

R/W

Hash Only Filtering mode (HO)

When set, the address check Function operates in the Imperfect address fil-

tering mode for both physical and multicast addresses. Refer to Section

11.4.2, "Hash Only Filtering," on page 143 for additional information.

R/W

RESERVED

Hash/Perfect Filtering Mode (HPFILT)

When cleared (0), the device will implement a perfect address filter on incom-

ing frames according the address specified in the Host MAC address regis-

ters (Host MAC Address High Register (HMAC_ADDRH) and Host MAC

Address Low Register (HMAC_ADDRL)).

When set (1), the address check function performs imperfect address filtering

of multicast incoming frames according to the hash table specified in the mul-

ticast hash table register. If the Hash Only Filtering mode (HO) bit 15 is set,

then the physical (IA) addresses are also imperfect filtered. If the Hash Only

Filtering mode (HO) bit is cleared, then the IA addresses are perfect address

filtered according to the MAC Address register Refer to Section 11.4.3, "Hash

Perfect Filtering," on page 143 for additional information.

R/W

RESERVED

Disable Broadcast Frames (BCAST)

When set, disables the reception of broadcast frames. When cleared, for-

wards all broadcast frames to the application.

Note:

When wake-up frame detection is enabled via the WUEN bit of the

Host MAC Wake-up Control and Status Register (HMAC_WUCSR),

a broadcast wake-up frame will wake-up the device despite the

state of this bit.

R/W

Disable Retry (DISRTY)

When set, the Host MAC attempts only one transmission. When a collision is

seen on the network, the Host MAC ignores the current frame and goes to

the next frame and a retry error is reported in the Transmit status. When

reset, the Host MAC attempts 16 transmissions before signaling a retry error.

R/W

RESERVED

Automatic Pad Stripping (PADSTR)

When set, the Host MAC strips the pad field on all incoming frames, if the

length field is less than 46 bytes. The FCS field is also stripped, since it is

computed at the transmitting station based on the data and pad field charac-

ters, and is invalid for a received frame that has had the pad characters

stripped. Receive frames with a 46-byte or greater length field are passed to

the application unmodified (FCS is not stripped). When cleared, the Host

MAC passes all incoming frames to the host unmodified.

R/W

Bits

Description

Type

Default

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