Rainbow Electronics W90N740 User Manual

Page 77

W90N740

Publication Release Date: November 26, 2004

- 73 -

Revision A4

Tx Status (TXSTA)

CCNT

SEQ

PAU

TXHA

LC TXABT NCS EXDEF

TXCP

Reserved

DEF TXINTR

TXINTR: Interrupt on Transmit

Set if transmission of packet causes an interrupt condition. It includes TXCP.

DEF: Transmit deferred

Set when MAC has to defer, if MAC is ready to transmit a frame, because the carrier sense input is
asserted before the MAC gets granted to acquire the network media.

TXCP: Transmission Completion

Set when MAC completes a transmission or discard one packet.

EXDEF: Exceed Deferral

Set if MAC deferring time to transmit exceeds 0.32768ms for 100Mbit/s or 3.2768ms for 10Mbit/s.

NCS: No Carrier Sense Error

Set if carrier sense is not detected during the entire transmission of a packet..

TXABT: Transmission Abort

Set if transmitting aborted because 16 collisions occurred in the same packet.

LC: Late Collision

Set if there is collision occurs after 64 bytes collision window.

TXHA: Transmission halted

Transmission halted by clearing TXON bit in the MCMDR.

PAU: Paused

Transmit is paused by a remote flow control command.

SQE: SQE error

After transmitting a frame, set if the fake collision signal did not come from the PHY for 1.6 µs.

CCNT: Transmit Collision Count

Count of collisions during transmission of a single packet. After 16 collisions, CCNT is 1111, and TXABT
is set.

7.5.2 7.5.2 EMC Register Mapping

This set of registers is used to convey status/control information to/from the Ethernet MAC controller.