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®
Intel
855GME Chipset and Intel
Figure 106.
Motherboard AC'97 CNR Implementation without Codec Down On Board
From
6300ESB
I/O Cntrlr
Hub
To
6300ESB
I/O Cntrlr
Hub
9.5.2
CNR Routing Summary
Table 81
Table 81.
CNR Routing Summary
Trace Impedance
90 Ω Differential
55 Ω ± 10%
Motherboard
(CNR 1.2 Compliant)
®
Intel
To GPIO
Intel
AC_SDIN0
AC_SDIN1
AC_SDIN2
represents a summary of the various interfaces routing requirements to the CNR Riser.
CNR Routing
Requirements
USB (7.5 on 7.5)
(See
Section 9.6.1.6
for
more details)
AC'97 (5 on 10)
January 2007
®
6300ESB ICH Embedded Platform Design Guide
®
Intel
AC_RST#
CDC_DN_ENAB#
R = 10K
Maximum Trace Length
to CNR connector
No more than 150 mils
10 inches
AC_BIT_CLK
(See
Table
76)
AC_SDOUT
(See
Table
77)
AC_SDIN (See
Table
78)
6300ESB Design Guidelines
CNR Connector
B1158-02
Signal Length
Signal
Matching
Referencing
Ground
trace mismatch.
N/A
Ground
209
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