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ALC5611-GR Datasheet(PDF) 17 Page - Realtek Semiconductor Corp.

Part # ALC5611-GR
Description  AC??7 AUDIO CODEC TOUCH PANEL CONTROLLER
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Manufacturer  REALTEK [Realtek Semiconductor Corp.]
Direct Link  https://www.realtek.com/en/
Logo REALTEK - Realtek Semiconductor Corp.

ALC5611-GR Datasheet(HTML) 17 Page - Realtek Semiconductor Corp.

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ALC5611
Datasheet
AC’97 Audio Codec + Touch Panel Controller
9
Track ID: JATR-1076-21
Rev. 1.1
7.3. Clocking
The Stereo_SYSCLK can be selected from MCLK or PLL. This means MCLK is always provided
externally, and the driver should arrange the clock of each block and setup each divider.
7.3.1.
Phase-Locked Loop
A Phase-Locked Loop (PLL) is used to provide a flexible input clock from 2.048MHz to 40MHz. Typical
choices are 2.048MHz, 4.096MHz, and 13MHz. The source of the PLL can be set to MCLK or MCLK/2
by setting PLL_pre_div.
The ALC5611 SYSCLK frequency is 24.576MHz. If the system cannot provide 24.576MHz to the
ALC5611, the PLL of the ALC5611 can be used to generate a frequency near 24.576MHz. As the PLL
parameter is configured through the AC link, the input clock to the MCLK pin must be between
2.048MHz and 80MHz. After the AC link is connected, the driver must configure the PLL in order to
output a frequency close to the SYSCLK (24.576MHz). The accuracy of audio output frequency will
depend on the accuracy of PLL output.
The PLL transmit formula is:
FOUT = (MCLK * (N+2))/((M+2) * (K+2)) {Typical K=2}
Table 8.
AC-Link Clock Setting Table (Unit: MHz)
MCLK
N
M
FVCO
K
FOUT
13
66
7
98.222
2
24.555
3.6864
78
1
98.304
2
24.576
2.048
94
0
98.304
2
24.576
4.096
70
1
98.304
2
24.576
After a Cold Reset, PLL related Registers are reset to default values, however, they are not reset to
default values after a soft-reset (write Reg00). Firmware should not power down the PLL when the PLL
output is used as Stereo_SYSCLK.
Note: The ALC5611 will only be enabled after an AC-Link Warm Reset.
7.3.2.
AC’97 Mode
For the AC-Link controller, the BIT_CLK driven by PLL will only be enabled after a warm reset.
The sampling rate of the stereo ADC and stereo DAC can be configured separately and is controlled by
Reg2C (stereo DAC) and Reg32 (stereo ADC).


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