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Torsten Waaga
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Karl Eder
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DM9161A: 10/100 Fast Ethernet Physical Layer TX/FX Single Chip Transceiver


The DM9161A is a physical-layer single chip low power transceiver for 10Base-T, 100Base-TX and 100FX operations. It supports HP´s Auto MDI-X technology. Patch and cross cables can automatically be twisted/untwisted. The identical PHY Core is also being used in the MAC/PHY Controllers DM9000A and DM9010.
It provides a strong support for the auto-negotiation function utilizing media speed and full-/half-duplex protocol selection. Due to the built-in wave-shaping filter, the DM9161A does not need any external filters to transport signals to the media in 100M or 10M Ethernet operations. Through the Media Independent Interface (MII), the DM9161A connects to the Medium Access Control (MAC) layer, ensuring a high inter-oparability among products from different vendors. The DM9161A uses a low-power and high-performance 2.5V CMOS process with integrated 3.3V to 2.5V voltage regulator and 5V tolerant I/Os. It contains the entire physical layer functions of 100BASE-Tx as defined by IEEE802.3u:

  • Pysical Coding Sublayer (PCS)
  • Physical Medium Attachement (PMA)
  • Twisted Pair Physical Medium Dependent Sublayer (TP-PMD)
  • 10Base-TX Encoder/Decoder (ENC/DEC)
  • Twisted Pair Media Access Unit (TPMAU)

The power-down mode, selectacle 1:1 or 1.25 :1 TX-driver allows further savings in power consumption.



No Description / Download Type Version Date Size
01 Davicom General Layout-Guide PDF 1.01 2011/05/05 719kB
02 Davicom Hardware Layout Guide PDF   2009/01/08 9,4M
03 Dacom Ethernet Design-In Guide PDF 1.00 2011/11/18 2,64M
04 Connecting 2 Davicom devices without transformers PDF   2007/12/11 76kB
05 Design hint Center-Tabs Transformer to PHY PDF   2011/02/02 305kB
06 Crystal Information PDF   2013/09/24 59kB
07 Programming-Reference-Flow-Chart PDF 1.00 2009/01/07 130kB

Part Specific:

11 DM9161A ESD Test Report PDF   2006/10/05 100kB
12 DM9161A Additional Information PDF     6kB
13 DM9161A_Layout Guide PDF 1.1 2008/03/17 135kB
14 DM9161A_MII Interface to DM9013 PDF   2007/10/25 756kB
15 DM9161A_connection to W3100A PDF   2006/02/08 21kB
16 DM9161A connection to W3150A PDF 1.0 2006/02/15 68kB
17 DM9161A_Changes to DM9162 PDF 2.0 2011/05/05 29kB
18 DM9161A_MII with Auto MDI-X PDF 2.0 2005/05/26 34kB
19 DM9161A_RMII with Auto-MDI-X PDF 2.0 2005/07/11 29kB
20 DM8603 to DM9161A_and DM9161C connection PDF 2.0 2012/05/25 106kB
21 PHY to Connector with Auto MDI-X 1.8V PDF   2011/04/14 113kB
22 DM9161A/B/C - DM9162_Schematic_Daughterboard PDF 1.1 2013/03/28 132kB
23 DM9161A - DM9161B_connection to LPC1768 PDF 1.5 2010/04/29 23kB
24 DM9161 - DM9161A_Power-on-Reset PDF 1.0 2007/07/13 23kB
25 DM9161A - DM9161B_Migration to DM9161C PDF 1.0 2010/05/21 108kB
26 DM9161x Series differences and how to change PDF   2008/08/27 185kB
27 DM9161A/B/C MII with Auto MDI-X PDF 0.5 2010/05/21 106kB
28 DM9161A_Auto-MDI-X connection to transformer HA-113 JPG   2005/04/25 36kB
29 DM9161A_Non-Auto-MDI-X connection to HA-113 JPG   2005/04/25 39kB
30 DM9161A-IPC1752 Sheet PDF 1.1 2014/03/05 856kB
31 DM916x-to-DM9163-Design-Differences PDF   2017/03/29 251kB

Technical Models and Drawings:

No Description / Download Type Version Date Size
41 DM9161A IBIS-File ZIP   2007/09/13 13kB
42 DM9161A PCB-File ZIP   2009/06/17 45kB
43 DM916x & DM9162 Schematic_Daughterboard DSN-File ZIP   2013/03/28 128kB