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 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 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 Daughter board
External links intel.com – MDC specification.pdf