E T H E R N E T C O M M U N I C A T I O N M O D U L E

. .

 

Ethernet Transmit Status register..

 

.

Register bit

assignment

Bits

Access

Mnemonic

Reset

Description

 

 

 

 

 

 

 

D31:16

N/A

Reserved

N/A

N/A

 

 

 

 

 

 

 

D15

R

TXOK

0x0

Frame transmitted OK

 

 

 

 

 

When set, indicates that the frame has been delivered to

 

 

 

 

 

and emptied from the transmit FIFO without problems.

 

 

 

 

 

 

 

D14

R

TXBR

0x0

Broadcast frame transmitted

 

 

 

 

 

When set, indicates the frame’s destination address was

 

 

 

 

 

a broadcast address.

 

 

 

 

 

 

 

D13

R

TXMC

0x0

Multicast frame transmitted

 

 

 

 

 

When set, indicates the frame’s destination address was

 

 

 

 

 

a multicast address.

 

 

 

 

 

 

 

D12

R

TXAL

0x0

TX abort — late collision

 

 

 

 

 

When set, indicates that the frame was aborted due to a

 

 

 

 

 

collision that occurred beyond the collision window set

 

 

 

 

 

in the Collision Window/Retry register. If this bit is set,

 

 

 

 

 

the TX_WR logic stops processing frames and sets the

 

 

 

 

 

TXERR bit in the Ethernet Interrupt Status register.

 

 

 

 

 

 

 

D11

R

TXAED

0x0

TX abort — excessive deferral

 

 

 

 

 

When set, indicates that the frame was deferred in

 

 

 

 

 

excess of 6071 nibble times in 100 Mbps or 24,287

 

 

 

 

 

times in 0 Mbps mode. This causes the frame to be

 

 

 

 

 

aborted if the excessive deferral bit is set to 0 in MAC

 

 

 

 

 

Configuration Register #2. If TXAED is set, the

 

 

 

 

 

TX_WR logic stops processing frames and sets the

 

 

 

 

 

TXERR bit in the Ethernet Interrupt Status register.

 

 

 

 

 

 

 

D10

R

TXAEC

0x0

TX abort — excessive collisions

 

 

 

 

 

When set, indicates that the frame was aborted because

 

 

 

 

 

the number of collisions exceeded the value set in the

 

 

 

 

 

Collision Window/Retry register. If this bit is set, the

 

 

 

 

 

TX_WR logic stops processing frames and sets the

 

 

 

 

 

TXERR bit in the Ethernet Interrupt Status register.

 

 

 

 

 

 

 

D09

R

TXAUR

0x0

TX abort — underrun

 

 

 

 

 

When set, indicates that the frame was aborted because

 

 

 

 

 

the TX_FIFO had an underrun. If this bit is set, the

TX_WR logic stops processing frames and sets the

TXERR bit in the Ethernet Interrupt Status register.

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Digi NS9215 manual Frame transmitted OK, Broadcast frame transmitted, Multicast frame transmitted, TX abort late collision

NS9215 specifications

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