LAN9500AI datasheet(160/213 Pages) MICROCHIP

160 / 213 page

LAN950x

DS00001875A-page 160

 2010 - 2015 Microchip Technology Inc.

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

multicast hash table register.

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