DM9008F datasheet(18/68 Pages) ETC

18 / 68 page

DM9008

ISA/Plug & Play Super Ethernet Contoller

Final

Version :DM9008-DS-F02

June 14, 2000

Transmit Status Register (TSR)

This register records events that occur on the media during

transmission of a packet. It is cleared when the next

transmission is initiated by the host.

All bits remain low unless the event that corresponds to

a particular bit occurs during transmission. Each transmission

should be followed by a read of this register. The contents of

this register are not specified until after the first transmission.

5432

OWC

CDH

CRS

ABT

COL

PTX

Bit

Symbol

Description

PTX

Packet Transmitted: Indicates transmission without error (no excessive colli-sions or FIFO

underrun) (ABT ="0", FU ="0")

Reserved

COL

Transmit Collided: Indicates that transmission collided at least once with another station on

the network. The number of collisions is recorded in the Number ofColli-sions Register (NCR)

ABT

Transmit Aborted: Indicates the DM9008 aborted transmission because of excessive

collisions (total number of transmissions including original transmission attempt equals 16)

CRS

Carrier Sense Lost: This bit is set when carrier is lost during transmission of the packet.

Carrier Sense is monitored from the end of Preamble/Synch until the end of transmission.

Transmission is not aborted on loss of carrier

FIFO Underrun: If the ENC cannot gain access to the bus before the FIF empties, this bit is

set. Transmission of the packet will be aborted

CDH

CD Heartbeat: Failure of the transceiver to transmit a collision signal after transmission of a

packet will set this bit. The Collision Detect (CD) heartbeat signal must commence during the

first 6.4

µs of the interframe gap followinga transmission. In certain collisions, the CD heartbeat

bit will be set even though the transceiver is not performing the CD heartbeat test

OWC

Out

of Window Collision: Indicates that a collision occurred after a slot time (51.2

µs).

Transmissions are rescheduled as in normal collisions

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