Mobile daughter card
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
External links
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