Mobile daughter card

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The mobile daughter card, also known as an MDC or CDC (communications daughter card), is a notebook version of the AMR slot on the motherboard of a desktop computer. It is designed to interface with special Ethernet (EDC), modem (MDC) or bluetooth (BDC) cards.

Intel MDC specification 1.0[edit]

In 1999, Intel published a specification for mobile audio/modem daughter cards. The document defines a standard connector (AMP* 3-179397-0), mechanical elements including several form factors, and electrical interface. The 30-pin connector carries power, several audio channels and AC-Link serial data. Up to two AC'97 codecs are supported on such a card.

Several form factors are specified:

  • 45 × 27 mm
  • 45 × 37 mm
  • 55 × 27 mm with RJ11 jack
  • 55 × 37 mm with RJ11 jack
  • 45 × 55 mm
  • 45 × 70 mm

30-pin AMP* 3-179397-0 pinout[edit]

1 MONO_OUT/PC_BEEP AUDIO_PWRDN 2
3 GND MONO_PHONE 4
5 AUXA_RIGHT RESERVED 6
7 AUXA_LEFT GND 8
9 CD_GND 5 Vmain 10
11 CD_RIGHT RESERVED 12
13 CD_LEFT RESERVED 14
15 GND PRIMARY_DN 16
17 3.3Vaux/dual 5VD 18
19 GND GND 20
21 3.3 Vmain AC97_SYNC 22
23 AC97_SDATA_OUT AC97_SDATA_INB 24
25 AC97_RESET# AC97_SDATA_INA 26
27 GND GND 28
29 AC97_MSTRCLK AC97_BITCLK 30

See also[edit]

External links[edit]