CNR Riser Card Pinout
CNR Riser Bus Description
The Communication and Networking Riser {CNR} specification defines
a hardware scalable Original Equipment Manufacturer (OEM) mother board
riser and interface that supports the audio, modem, and local area
network (LAN) interfaces of core logic chipsets. This standard does not
support an expansion slot, but an OEM built in board to include the
Motherboard connector [CNR Connector]. Supported interface buses include,
AC '97, SMBus and USB including Power and a LAN interface. The board
size and pinout are also defined in the specification for the ATX series
of motherboard form factor. It appears Intel no longer produces CNR slots
on its Pentium 4 Processor
based Motherboards. The CNR standard was
replaced by another standard, refer to the main PC Riser Card page for
other Rise card form factors. The CNR specification defined two connector
types. The pinout for types 'A' and type 'B' are listed below.
The Type 'A' pinout is listed first, followed by the Type 'B' pin out.
CNR Riser Card Pinout, Type A
Pin # |
B Side |
A Side |
1 |
Reserved |
Reserved |
2 |
Reserved |
Reserved |
3 |
Reserved |
GND |
4 |
GND |
Reserved |
5 |
Reserved |
Reserved |
6 |
Reserved |
GND |
7 |
GND |
LAN_TXD2 |
8 |
LAN_TXD1 |
LAN_TXD0 |
9 |
LAN_RSTSYNC |
GND |
10 |
GND |
LAN_CLK |
11 |
LAN_RXD2 |
LAN_RXD1 |
12 |
LAN_RXD0 |
Reserved |
13 |
GND |
USB+ |
14 |
Reserved |
GND |
15 |
+5Vdual |
USB- |
16 |
USB_OC# |
+12V |
17 |
GND |
GND |
18 |
-12V |
+3.3Vdual |
19 |
+3.3VD |
+5VD |
KEY |
KEY |
20 |
GND |
GND |
21 |
EE_DOUT |
EE_DIN |
22 |
EE_SHCLK |
EE_CS |
23 |
GND |
SMB_A1 |
24 |
SMB_A0 |
SMB_A2 |
25 |
SMB_SCL |
SMB_SDA |
26 |
CDC_DN_ENAB# |
AC97_RESET# |
27 |
GND |
Reserved |
28 |
AC97_SYNC |
AC97_SDATA_IN1 |
29 |
AC97_SDATA_OUT |
AC97_SDATA_IN0 |
30 |
AC97_BITCLK |
GND |
CNR Riser Card Pinout, Type B
Pin # |
B Side |
A Side |
1 |
MIL_MDIO |
MIL_MDC |
2 |
MIL_COL |
MIL_CRS |
3 |
MIL_TXC |
GND |
4 |
GND |
MIL_RXDV |
5 |
MIL_RXERR |
MIL_RXC |
6 |
MIL_TXD3 |
GND |
7 |
GND |
MIL_TXD2 |
8 |
MIL_TXD1 |
MIL_TXD0 |
9 |
MIL_TXEN |
GND |
10 |
GND |
Reserved |
11 |
MIL_RXD2 |
MIL_RXD1 |
12 |
MIL_RXD0 |
MIL_RXD3 |
13 |
GND |
USB+ |
14 |
Reserved |
GND |
15 |
+5V dual |
USB- |
16 |
USB_OC# |
+12V |
17 |
GND |
GND |
18 |
-12V |
+3.3V dual |
19 |
+3.3VD |
+5VD |
KEY |
KEY |
20 |
GND |
GND |
21 |
EE_DOUT |
EE_DIN |
22 |
EE_SHCLK |
EE_CS |
23 |
GND |
SMB_A1 |
24 |
SMB_A0 |
SMB_A2 |
25 |
SMB_SCL |
SMB_SDA |
26 |
CDC_DN_ENAB# |
AC97_RESET# |
27 |
GND |
Reserved |
28 |
AC97_SYNC |
AC97_SDATA_IN1 |
29 |
AC97_SDATA_OUT |
AC97_SDATA_IN0 |
30 |
AC97_BITCLK |
GND |
Note AC97 is dated, or maybe out-dated depending on your view point.
Modified: 3/05/12
Copyright © 1998 - 2016 All rights reserved Larry Davis