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DM9102DEP датащи(PDF) 44 Page - Davicom Semiconductor, Inc.

номер детали DM9102DEP
подробное описание детали  Single Chip Fast Ethernet NIC Controller
PDF  70 Pages
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производитель  DAVICOM [Davicom Semiconductor, Inc.]
домашняя страница  http://www.davicom.com.tw
Logo DAVICOM - Davicom Semiconductor, Inc.

DM9102DEP датащи(HTML) 44 Page - Davicom Semiconductor, Inc.

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44
Final
Version: DM9102D-DS-F01
May 10, 2006
31
0
OWN
Status
Control
bits
Buffer Address
Next Descriptor Address
TDES0
TDES1
TDES2
TDES3
Buffer Length
OWN
Transmit Descriptor Format
TDES0: Owner Bit with Transmit Status
Bit 31: OWN,
1=owned by DM9102D, 0=owned by host, this bit should be
set when the transmitting buffer is filled with data and ready
to be transmitted. It will be reset by DM9102D after
transmitting the whole data buffer.
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
ES
EC
0
CC
TX
JT
LOC
NC
LC
0
FUE
DF
This word wide content includes status of transmitted frame.
They are loaded after the data buffer that belongs to the
corresponding descriptor is transmitted.
Bit 15: ES, Error Summary
It is set for the following error conditions:
Transmit Jabber Time-out (TXJT=1), Loss of Carrier
(LOC=1), No Carrier (NC=1), Late Collision (LC=1),
Excessive Collision (EC=1), FIFO Underrun Error (FUE=1).
Bit 14: TXJT, Transmit Jabber Time Out
It is set to indicate the transmitted frame is truncated due to
transmit jabber time out condition. The transmit jabber time
out interrupt CR5<3> is set.
Bit 11: LOC, Loss of Carrier
It is set to indicate the loss of carrier during the frame
transmission. It is not valid in internal loopback mode.
Bit 10: NC, No Carrier
It is set to indicate that no carrier signal from transceiver is
found. It is not valid in internal loopback mode.
Bit 9: LC, Late Collision
It is set to indicate a collision occurs after the collision
window of 64 bytes. Not valid if FUE is set.
Bit 8: EC, Excessive collision
It is set to indicate that the transmission is aborted due to 16
excessive collisions.
Bit 7: Reserved
This bit is 0 when read.
Bits 6-3: CC, Collision Count
These
bits
show
the
number
of
collision
before
transmission. Not valid if excessive collision bit is also set.
Bit 2: Reserved
This bit is 0 when read.
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
OWN



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