LAN83C171 datasheet(40/90 Pages) SMSC

40 / 90 page

1 - NON-DEFERRED TRANSMISSION: This

bit

set

the

frame

transmitted

successfully without deferring.

A deferred

transmission can only occur the first time an

attempt is made to send a packet. Collisions

are not deferred transmissions.

0 - PACKET TRANSMITTED: This bit is set to

indicate transmission

of a packet without

excessive collisions or abort.

DWORD 1 - DATA BUFFER/START OF

FRAGLIST

POINTER

bit

Number

Description

31 through 0: Starting address of data buffer

fragment list in host memory space.

Fragment list must be DWORD aligned. Data

buffer may be aligned on any byte.

DWORD 2 - CONTROL/DATA LENGTH Bit

Number Description

31 through 21 Reserved: Must always be set

to 0.

20 - LASTDESCR: Indicates that this is the

last descriptor for the current transmit frame

(Not used when FRAGLIST = 1).

19 - NOCRC: Disable automatic CRC generation

for this packet when set.

18 - IAF: When set, interrupt after this frame is

transmitted.

17 - LFFORM: Fragment list format - A "1"

indicates that the data length field comes before

the pointer in the fragment list. "0" indicates that

the pointer comes before the data length.

16 - FRAGLIST: Indicates that this descriptor

points to a fragment list.

15 through 0 - Length of data buffer (Not used

when FRAGLIST = 1).

DWORD 3 - NEXT DESCRIPTOR POINTER Bit

Number Description

31 through 2 - Starting address of next descriptor

in host memory space.

Descriptors must be

DWORD aligned.

1 - 0: Unused.

LAN83C171 Datasheet(PDF) 40 Page - SMSC Corporation

LAN83C171 Datasheet(HTML) 40 Page - SMSC Corporation

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