PIC16F639-E/SO【PDF 18/74 页】IC MCU FLASH 2KX14 20SOIC

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Sheet目录3878

14页 15页 16页 17页 [18页]19页 20页 21页 22页

Micrel, Inc.

KSZ8841-PMQL

October 2007

M9999-100407-1.5

Bit

Description

UDPE UDP Checksum Error

When set, indicates that the received frame is an UDP/IP packet and its UDP checksum field

does not match.

This bit is valid only when last descriptor is set.

ES Error Summary

Indicates the logical OR of the following RDES0 bits:

CRC error

Frame too long

Runt frame

This bit is valid only when last descriptor is set.

MF Multicast Frame

When set, indicates that this frame has a multicast address.

This bit is valid only when last descriptor is set.

23 - 20

SPN Switch Engine Source Port Number

This field indicates the source port where the packet originated.

If bit 20 is set, it indicates the packet was received from port 1. If bit 21 is set, it indicates the

packet was received from port 2.

This field is valid only when the last descriptor is set.

(Bits 23 and 22 are not used, but reserved for backward compatibility and future expansion.)

RE Report on MII Error

When set, indicates that a receive error in the physical layer was reported during the frame

reception.

TL Frame Too Long

When set, indicates that the frame length exceeds the maximum size of 1518 bytes.

This bit is valid only when last descriptor is set.

Note: Frame too long is only a frame length indication and does not cause any frame

truncation.

RF Runt Frame

When set, indicates that this frame was damaged by a collision or premature termination

before the collision window has passed. Runt frames are passed on to the host only if the

pass bad frame bit is set.

CE CRC Error

When set, indicates that a CRC error occurred on the received frame.

This bit is valid only when last descriptor is set.

FT Frame Type

When set, indicates that the frame is an Ethernet-type frame (frame length field is greater

than 1500 bytes). When clear, indicates that the frame is an IEEE 802.3 frame.

This bit is not valid for runt frames.

This bit is valid only when last descriptor is set.

14 - 11

Reserved

10 - 0

FL Frame Length

Indicates the length, in bytes, of the received frame, including the CRC.

This field is valid only when last descriptor is set and descriptor error is reset.

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