ENC28J60-CSLASHML datasheet(43/96 Pages) MICROCHIP

43 / 96 page

Preliminary

DS39662B-page 41

ENC28J60

TABLE 7-1:

TRANSMIT STATUS VECTORS

Bit

Field

Description

55-52

Zero

Transmit VLAN Tagged Frame

Frame’s length/type field contained 8100h which is the VLAN protocol

identifier.

Backpressure Applied

Carrier sense method backpressure was previously applied.

Transmit Pause Control Frame

The frame transmitted was a control frame with a valid pause opcode.

Transmit Control Frame

The frame transmitted was a control frame.

47-32

Total Bytes Transmitted on Wire

Total bytes transmitted on the wire for the current packet, including all

bytes from collided attempts.

Transmit Underrun

Reserved. This bit will always be ‘0’.

Transmit Giant

Byte count for frame was greater than MAMXFL.

Transmit Late Collision

Collision occurred beyond the collision window (MACLCON2).

Transmit Excessive Collision

Packet was aborted after the number of collisions exceeded the

retransmission maximum (MACLCON1).

Transmit Excessive Defer

Packet was deferred in excess of 24,287 bit times (2.4287ms).

Transmit Packet Defer

Packet was deferred for at least one attempt but less than an excessive

defer.

Transmit Broadcast

Packet’s destination address was a broadcast address.

Transmit Multicast

Packet’s destination address was a multicast address.

Transmit Done

Transmission of the packet was completed.

Transmit Length Out of Range

Indicates that frame type/length field was larger than 1500 bytes (type

field).

Transmit Length Check Error

Indicates that frame length field value in the packet does not match the

actual data byte length and is not a type field. MACON3.FRMLNEN

must be set to get this error.

Transmit CRC Error

The attached CRC in the packet did not match the internally generated

CRC.

19-16

Transmit Collision Count

Number of collisions the current packet incurred during transmission

attempts. It applies to successfully transmitted packets and as such, will

not show the possible maximum count of 16 collisions.

15-0

Transmit Byte Count

Total bytes in frame not counting collided bytes.

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