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We Connect
We Connect
Table B-4. Signal Groups Associated with Their Audio Ground Plane
Ground Planes
Audio input signals: AUX_L. AUX_R, VIDEO_L, VIDEO_L, VIDEO_R, CD_L. CD_R,
CD_GND, LINE_IN_L, LINE_IN_OUT, MIC1, MIC2, PHONE_IN
GND_AUD
Audio reference signals: MONO_OUT, VREFOUT, VREF, AFILT1 and AFILT2
Analog Power signals: AVDD1, AVDD2, AVSS1 and AVSS2
GND_LOUT
Audio output signals: LINE_OUT_L, LINE_OUT_R, LNLVL_OUT_L and LNLVL_OUT_R
Game/MIDI port signals: JAB1, JBB1, JACX, JACB, MSO, JBCY, JACY, JBB2, JAB2
GND_MIDI
Digital power signals: DVDD1, DVDD2, DVSS1 and DVSS2
Digital Ground
AC link signals: SYNC, SDIN, SDOUT, -ACRST, and BIT_CLK
Miscellaneous signals: XTL_IN, XTL_OUT, PC_BEEP, EAPD, ID1 and ID0
Power planes
Referring to Figure B-4, no analog power plane partitions on the PCB power layer (3
signals had been laid on the component layer. These signals can directly refer to their respective ground plane. The power planes
represented on the component or solder layer should be placed directly over their respective ground plane. For example, the
AVDD5 power plane should not be outside of the GND_AUD (analog ground) plane.
All analog power supply connections and routing on the component layer should be over the analog ground planes and all of the
digital power connections and routing on the component layer should be over digital ground planes. The +12V input voltage to the
regulator should be a wide trace that routes over the digital ground plane. +12V routing over digital planes and located near the
edge of the board. Analog section is well bounded making it easy to create power/ground sandwich.
Preliminary Revision 0.5, November 19, 1999
Guidelines
Design Guide - VT82C694X Apollo Pro133 with VT82C686A
Audio Signals
Figure B-4. Power Layer Layout Example
104
rd
layer in our case) is required since all audio
Appendix B - Audio Codec and Game/MIDI Port Layout
Note
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