Motherboard connectors pinouts
Audio Modem riser (AMR) slot is used for connecting a specific hardware, such as Cable Modem or Audio Codec.

This slot uses a 46-pin, 50-position PCI-like connector; 2 pairs of positions are occupied by key.

This slot may be designated as slightly repositioned cutted 3.3V PCI slot: short parts of AMR and PCI slot have equal length (it made ACR - an extension to AMR - possible with use of standard PCI connector).

As PCI, AMR may share its place with ISA slot.

Generally, color of slot is grey-brown.

Component (primary) and solder (secondary) sides of board are identical to PCI.

Pins are counted from card bracket to the deeper edge of board; B is primary side of board, A is secondary (as with the PCI).

Connector is divided into 2 sections by a key, as in PCI.

Instead of PCI-like numbering of contacts, AMR does not specify numbers for positions occupied by key. For example, 3.3V PCI slot ends its first part at A11/B11, and starts second at A14/B14 (as these 12th and 13th positions may be populated in 5V slot), but AMR continues at A12/B12, because populating the key area with contacts is not planned.

 

B1

AUDIO_MUTE#

AUDIO_PWRDN

A1

B2

GND

MONO_PHONE

A2

B3

MONO_OUT/PC_BEEP

RESERVED

A3

B4

RESERVED

RESERVED

A4

B5

RESERVED

RESERVED

A5

B6

PRIMARY_DN#

GND

A6

B7

-12V

+5V dual / +5VSB

A7

B8

GND

USB_OC#

A8

B9

+12V

GND

A9

B10

GND

USB+

A10

B11

+5V Digital

USB-

A11

 

Keyway

Keyway

 

 

Keyway

Keyway

 

B12

GND

GND

A12

B13

RESERVED

S/P-DIF_IN

A13

B14

RESERVED

GND

A14

B15

+3.3V Digital

+3.3V dual / +3.3VSB

A15

B16

GND

GND

A16

B17

AC97_SDATA_OUT

AC97_SYNC

A17

B18

AC97_RESET#

GND

A18

B19

AC97_SDATA_IN3

AC97_SDATA_IN1

A19

B20

GND

GND

A20

B21

AC97_SDATA_IN2

AC97_SDATA_IN0

A21

B22

GND

GND

A22

B23

AC97_MSTRCLK

AC97_BITCLK

A23

 


unknown connector
at the computer mainboard
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Source(s) of this and additional information: http://www.infobytes.de/pages/AudioModemRiser.pdf
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