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ALC888S-VD Datenblatt(PDF) 28 Page - Realtek Semiconductor Corp.

Teilenummer ALC888S-VD
Bauteilbeschribung  7.12 CHANNEL HD AUDIO CODEC WITH TWO INDEPENDENT SPDIF OUTPUTS
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Hersteller  REALTEK [Realtek Semiconductor Corp.]
Direct Link  https://www.realtek.com/en/
Logo REALTEK - Realtek Semiconductor Corp.

ALC888S-VD Datenblatt(HTML) 28 Page - Realtek Semiconductor Corp.

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ALC888S-VD
Datasheet
7.1+2 Channel HD Audio Codec with Two Independent
SPDIF Outputs
20
Track ID: JATR-2265-11
Rev. 1.2
7.3. Reset and Initialization
There are two types of reset within an HDA link:
• Link Reset. Generated by assertion of the RST# signal, all codecs return to their power on state
• Codec Reset. Generated by software directing a command to reset a specific codec back to its default
state
An initialization sequence is requested after any of the following three events:
• Link Reset
• Codec Reset
• Codec changes its power state (for example, hot docking a codec to an HDA system)
7.3.1.
Link Reset
A link reset may be caused by 3 events:
1. The HDA controller asserts RST# for any reason (power up, or PCI reset)
2. Software initiates a link reset via the ‘CRST’ bit in the Global Control Register (GCR) of the HDA
controller
3. Software initiates power management sequences. Figure 13, shows the ‘Link Reset’ timing including
the ‘Enter’ sequence ( ~ ) and ‘Exit’ sequence ( ~ )
Enter ‘Link Reset’:
Software writes a 0 to the ‘CRST’ bit in the Global Control Register of the HDA controller to initiate a
link reset
When the controller completes the current frame, it does not signal the normal 8-bit frame SYNC at
the end of the frame
The controller drives SYNC and all SDOs to low. Codecs also drive SDIs to low
The controller asserts the RST# signal to low, and enters the ‘Link Reset’ state
All link signals driven by controller and codecs should be tri-state by internal pull low resistors


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