92hd89c Integrated Device Technology, 92hd89c Datasheet - Page 27

• Manufacturer Part Number: 92hd89c
• Description: Six Channel Hd Audio Codec
• Manufacturer: Integrated Device Technology

92HD89C
Six channel HD Audio codec optimized for low power
©2009 INTEGRATED DEVICE TECHNOLOGY, INC.
IDT™ CONFIDENTIAL
2.14. Analog PC-Beep
The codec supports automatic routing of the PC_Beep pin to several outputs when the HD-Link is in
reset. The codec will route PC_Beep to ports A, B, D, and F by default when reset is applied. To pre-
vent pops, beep is not enabled immediately when power is applied. The codec will mute outputs and
wait until references and amplifiers have stabalized before enabling beep pass thru after power on
reset. To prevent pops when removing power, automatic routing of PC_Beep is not supported in
D3cold, D4, or D5.
Analog PC-Beep may also be supported during HD-Link Reset if analog PC_Beep is manually
enabled before entering reset. Analog PC_Beep is mixed at the port and only ports enabled as out-
puts will pass PC_Beep.
PC-Beep may be attenuated and distorted when the CODEC is in D3 depending on the load imped-
ance seen by the output amplifier since all ports are in a low power state while in D3. Load imped-
ances of 10K or larger can support full scale outputs but lower impedance loads will distort unless
the output amplitude is reduced.
Analog PC_Beep is not supported in D3 Cold, or the vendor specific states D4/D5.
Analog PC_Beep is typically used during POST to route error beep codes to internal speakers for
diagnostic purposes. When using a legacy OS such as DOS, analog PC_Beep routes “Bell” and
“Alarm” tones from the south bridge to internal speakers or headphones. Keyboard controller “Key-
click” sounds are also routed to internal speakers using the analog beep function in both Windows
and legacy operating systems
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92HD89C