DM9008F datasheet(17/68 Pages) ETC

17 / 68 page

DM9008

ISA/Plug & Play Super Ethernet Contoller

Final

Version :DM9008-DS-F02

June 14, 2000

Transmit Configuration Register (TCR)

The transmit configuration register determines the actions of the transmitter section of the DM9008 during transmission of a packet on

the network. LB1 and LB0 power up as 0.

5432

OFST

ATD

LB1

LB0

CRC

Bit

Symbol

Description

CRC

Inhibit CRC

0: CRC appended by transmitter

1: CRC inhibited by transmitter

LB0

LB1

Encoded Loopback Control: These encoded configuration bits set the type ofloopback that

is to be performed. Note that loopback in mode 2 sets the ENA in loopback mode and

that D3 of the DCR must be set to zero for loopback operation

LB1

LB0

Mode 0

Normal Operation

Mode 1

ENC moduleLoopback

Mode 2

ENA moduleLoopback

Mode 3

Loopback to Coax

ATD

Auto Transmit Disable: This bit allows another station to disable the DM9008 transmitter by

transmission of a particular multicast packet. The transmitter can be re-enabled by

resetting this bit or by reception of a second particular multicast packet

0: Normal Operation

1: Reception of multicast address hashing to bit 62 disables transmitter; reception of

multicast address hashing to bit 63 enables transmitter

OFST

Collision Offset Enable: This bit modifies the backoff algorithm to allow propitiation of

nodes

0: Backoff Logic implements normal algorithm

1: Forces Backoff algorithm modification to 0 to 2

min(3+n,10) slot times for first

three collisions, then follows standard backoff. (For first three collisions, station has

higher average backoff delay, resulting in a low priority mode.)

Reserve must be set to zero

Reserved

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