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MTD800

Integrated Fast Ethernet Controller

Myson Century Inc 

MYSON

TECHNOLOGY

MTD 800

(Preliminary)

O Reserved

TSW

TCW

PKTS[10:0]

TBS[10:0]

Tx Data Buffer Start Address

Next Descriptor Address

Figure 3.2 The Transmit Descriptor Format

Table 3.1 Transmit Descriptor 0 ( TDES0)

Bit

31

30 -13

13

12

11

10

9

8

7- 0

Symbol

OWN

-

ABORT

CSL

LC

EC

DFR

HF

NCR[7:0]

Descr iption

Owner: This bit is controlled by driver, When set, identifies that the

descriptor is owned by the MTD800. When reset, indicates that the

descriptor is owned by the host; Driver must reset this bit when initializa-

tion.

Reserved

Transmit Status Word (TSW)

Abort: This bit is set when the current transmitting packet is aborted due

to the excessive collision or late collision,

Carrier Sense Lost: When set, the carrier is lost during the transmission

of packet.

Late Collision: This bit is set when late collision occurs.

Excessive Collisions: This bit is set when the successive collision count

exceeds 16 or 256 and the transmitting packet will be aborted.

Deferred: When set, indicates that MTD800 has to defer while ready to

transmit a frame because of carrier sense asserted.

Heart-beat Failure: This bit is only effective in 10Base-T mode. When

set, indicates a heartbeat collision check failure.

Collision Retry Count: This 8-bit counter indicates that the number of

collisions have occurred.

aa

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MTD800 Revision 0.0 07/20/1999

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