LAN89730 datasheet(162/218 Pages) MICROCHIP

162 / 218 page

LAN89730

DS60001348A-page 162

 2013-2015 Microchip Technology Inc.

Hash Only Filtering mode (HO)

When set, the address check function operates in the imperfect address filter-

ing mode both for physical and multicast addresses.

R/W

RESERVED

Hash/Perfect Filtering Mode (HPFILT)

When reset (‘0’), the device will implement a perfect address filter on incoming

frames, according the address specified in the MAC address register.

When set (‘1’), the address check function does imperfect address filtering of

multicast incoming frames according to the hash table specified in the multi-

cast hash table register.

If the Hash Only Filtering mode (HO) bit is set (‘1’), then the physical

addresses (IA) are imperfect filtered too. If the Hash Only Filtering mode (HO)

bit is reset (‘0’), then the IA addresses are perfect address filtered according

to the MAC Address register.

R/W

Late Collision Control (LCOLL)

When set, enables retransmission of the collided frame even after the collision

period (late collision). When reset, the MAC disables frame transmission on a

late collision. In any case, the Late Collision status is appropriately updated in

the Transmit Packet status.

R/W

Disable Broadcast Frames (BCAST)

When set, disables the reception of broadcast frames. When reset, forwards

all broadcast frames to the application.

Note:

When Wakeup Frame detection is enabled via the Wakeup Frame

Enable (WUEN) bit of the Wakeup Control and Status Register

(WUCSR), a broadcast Wakeup Frame will wake up the device

despite the state of this bit.

R/W

Disable Retry (DISRTY)

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

on the bus, the MAC ignores the current frame and goes to the next frame and

a retry error is reported in the Transmit status. When reset, the MAC attempts

16 transmissions before signaling a retry error.

R/W

RESERVED

Automatic Pad Stripping (PADSTR)

When set, the 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 characters, 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 reset, the MAC passes all incoming

frames to system memory unmodified.

R/W

Bits

Description

Type

Default

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