LAN9730 datasheet(56/222 Pages) MICROCHIP

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LAN9730/LAN9730i

DS00001946A-page 56

 2012-2015 Microchip Technology Inc.

4.4.2.6

TX Status Format

After an Ethernet frame is transmitted, the TLI returns the TX Status Word to the FCT, as illustrated in Table 4-44. The

contents of the TX Status Word is used for statistics generation and interrupt status creation. Refer to Section 4.3.1.7,

"Statistics" and Section 6.3.2, "Interrupt Status Register (INT_STS)" for further details.

TABLE 4-44:

TX STATUS WORD FORMAT

Bits

Description

31:16

RESERVED

Error Status (ES)

When set, this bit indicates that the TLI has reported an error. This bit is the logical OR of bits 11, 10, 9,

8, 2, 1 in this status word.

14:12

RESERVED

Loss of Carrier

When set, this bit indicates the loss of carrier during transmission.

No Carrier

When set, this bit indicates that the carrier signal from the transceiver was not present during transmis-

sion.

Late Collision

When set, indicates that the packet transmission was aborted after the collision window of 64 bytes.

Excessive Collisions

When set, this bit indicates that the transmission was aborted after 16 collisions while attempting to

transmit the current packet.

RESERVED

6:3

Collision Count

This counter indicates the number of collisions that occurred before the packet was transmitted. It is not

valid when Excessive Collisions (bit 8) is also set.

Excessive Deferral

If the deferred bit is set in the Control register, the setting of the Excessive Deferral bit indicates that the

transmission has ended because of a deferral of over 24288 bit times during transmission.

Underrun Error

When set, this bit indicates that the transmitter aborted the associated frame because of an underrun

condition on the TX Data FIFO. TX Underrun will cause the assertion of the TDFU flag in the Interrupt

Status Register (INT_STS) and the interrupt Endpoint.

Deferred

When set, this bit indicates that the current packet transmission was deferred.

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