Electronic Components Datasheet Search
  English  ▼

Delete All


Preview PDF Download HTML

DM9006 Datasheet(PDF) 68 Page - Davicom Semiconductor, Inc.

Part No. DM9006
Description  10/100 Mbps 2-port Ethernet Switch Controller with General Processor Interface
Download  76 Pages
Scroll/Zoom Zoom In 100% Zoom Out
Maker  DAVICOM [Davicom Semiconductor, Inc.]
Homepage  http://www.davicom.com.tw
Logo DAVICOM - Davicom Semiconductor, Inc.

DM9006 Datasheet(HTML) 68 Page - Davicom Semiconductor, Inc.

Back Button DM9006 Datasheet HTML 64Page - Davicom Semiconductor, Inc. DM9006 Datasheet HTML 65Page - Davicom Semiconductor, Inc. DM9006 Datasheet HTML 66Page - Davicom Semiconductor, Inc. DM9006 Datasheet HTML 67Page - Davicom Semiconductor, Inc. DM9006 Datasheet HTML 68Page - Davicom Semiconductor, Inc. DM9006 Datasheet HTML 69Page - Davicom Semiconductor, Inc. DM9006 Datasheet HTML 70Page - Davicom Semiconductor, Inc. DM9006 Datasheet HTML 71Page - Davicom Semiconductor, Inc. DM9006 Datasheet HTML 72Page - Davicom Semiconductor, Inc. Next Button
Zoom Inzoom in Zoom Outzoom out
 68 / 76 page
background image
2-port Switch with Processor Interface
Preliminary datasheet
September 1, 2009 Code Group Alignment
The Code Group Alignment block receives un-aligned
5B data from the descrambler and converts it into 5B
code group data. Code Group Alignment occurs after
the J/K is detected and subsequent data is aligned on
a fixed boundary. 4B5B Decoder
The 4B5B Decoder functions as a look-up table that
translates incoming 5B code groups into 4B (Nibble)
data. When receiving a frame, the first 2 5-bit code
groups receive the start-of-frame delimiter (J/K
symbols). The J/K symbol pair is stripped and two
nibbles of preamble pattern are substituted. The last
two code groups are the end-of-frame delimiter (T/R
The T/R symbol pair is also stripped from the nibble,
presented to the Reconciliation layer.
9.3.3 10Base-T Operation
The 10Base-T transceiver is IEEE 802.3u compliant.
When the DM9006 is operating in 10Base-T mode,
the coding scheme is Manchester. Data processed
for transmit is presented in nibble format, converted
to a serial bit stream, then the Manchester encoded.
When receiving, the bit stream, encoded by the
Manchester, is decoded and converted into nibble
9.3.4 Collision Detection
For half-duplex operation, a collision is detected
when the transmit and receive channels are active
simultaneously. Collision detection is disabled in full
duplex operation.
9.3.5 Carrier Sense
Carrier Sense (CRS) is asserted in half-duplex
operation during transmission or reception of data.
During full-duplex mode, CRS is asserted only during
receive operations.
9.3.6 Auto-Negotiation
The objective of Auto-negotiation is to provide a
means to exchange information between linked
devices and to automatically configure both devices
to take maximum advantage of their abilities. It is
important to note that Auto-negotiation does not test
the characteristics of the linked segment. The
Auto-Negotiation function provides a means for a
device to advertise supported modes of operation to
a remote link partner, acknowledge the receipt and
understanding of common modes of operation, and to
reject un-shared modes of operation. This allows
devices on both ends of a segment to establish a link
at the best common mode of operation. If more than
one common mode exists between the two devices, a
mechanism is provided to allow the devices to
resolve to a single mode of operation using a
predetermined priority resolution function.
Auto-negotiation also provides a parallel detection
function for devices that do not support the
Auto-negotiation feature. During Parallel detection
there is no exchange of information of configuration.
Instead, the receive signal is examined. If it is
discovered that the signal matches a technology,
which the receiving device supports, a connection will
be automatically established using that technology.
This allows devices not to support Auto-negotiation
but support a common mode of operation to establish
a link.

Html Pages

1  2  3  4  5  6  7  8  9  10  11  12  13  14  15  16  17  18  19  20  21  22  23  24  25  26  27  28  29  30  31  32  33  34  35  36  37  38  39  40  41  42  43  44  45  46  47  48  49  50  51  52  53  54  55  56  57  58  59  60  61  62  63  64  65  66  67  68  69  70  71  72  73  74  75  76 

Datasheet Download

Go To PDF Page

Link URL

Privacy Policy
Does ALLDATASHEET help your business so far?  [ DONATE ]  

About Alldatasheet   |   Advertisement   |   Datasheet Upload   |   Contact us   |   Privacy Policy   |   Alldatasheet API   |   Link Exchange   |   Manufacturer List
All Rights Reserved© Alldatasheet.com

Mirror Sites
English : Alldatasheet.com  |   English : Alldatasheet.net  |   Chinese : Alldatasheetcn.com  |   German : Alldatasheetde.com  |   Japanese : Alldatasheet.jp
Russian : Alldatasheetru.com  |   Korean : Alldatasheet.co.kr  |   Spanish : Alldatasheet.es  |   French : Alldatasheet.fr  |   Italian : Alldatasheetit.com
Portuguese : Alldatasheetpt.com  |   Polish : Alldatasheet.pl  |   Vietnamese : Alldatasheet.vn