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Table 66. AC'97 AC_SDOUT/AC_SYNC Routing Summary
AC'97 Routing
Requirements
5 on 5
NOTES:
1. Simulations were performed using Analog Device's* Codec (AD1885) and the Cirrus Logic's* Codec
(CS4205b). Results showed that if the AD1885 codec was used a 33- Ω resistor was best for R1 and if the
CS4205b codec was used a 47- Ω resistor for R1 was best.
2. Bench data shows that a 47- Ω resistor for R1 is best for the Sigmatel* 9750 codec.
Figure 79. ICH4-M AC'97 – AC_SDIN Topology
Table 67. AC'97 AC_SDIN Routing Summary
AC'97 Routing
Requirements
5 on 5
NOTES:
1. Simulations were performed using Analog Device's Codec (AD1885) and the Cirrus Logic's Codec (CS4205b).
Results showed that if the AD1885 codec was used a 33- Ω resistor was best for R1 and if the CS4205b codec
was used a 47- Ω resistor for R1 was best.
2. Bench data shows that a 47- Ω resistor for R1 is best for the Sigmatel 9750 codec.
®
Intel
852GM Chipset Platform Design Guide
Maximum Trace Length
(inches)
L1 = (1 to 6) – L3
L2 = 1 to 8
L3 = 0.1 to 0.4
L4 = (0.1 to 6) – L3
ICH4-M
Y2
AC_SDIN2
Y3
AC_SDIN1
Y3
AC_SDIN0
Maximum Trace Length
(inches)
Y1 = 0.1 to 0.4
Y2 = (1 to 8) – Y1
Y3 = (1 to 14) – Y1
Y4 = (1 to 6) – Y1
Y5 = (0.1 to 6) – Y1
Series Termination
Resistance
R1 = 33 Ω - 47 Ω
R2 = R1 if the connector
card that will be used with
the platform does not have a
series termination on the
card. Otherwise R2 = 0 Ω
Codec
Y5
R1
Y1
R2
Y1
Y4
R2
Y1
R2
Y1
Series Termination
Resistance
R1 = 33 Ω - 47 Ω
R2 = R1 if the connector
card that will be used
with the platform does
not have a series
termination on the card.
Otherwise R2 = 0 Ω
I/O Subsystem
AC_SDOUT/AC_SYNC
Signal Length
Matching
N/A
CONN
AC97_SDATA_IN2
AC97_SDATA_IN1
AC97_SDATA_IN0
AC_SDIN Signal
Length Matching
N/A
161
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