alc658 Realtek Semiconductor Corporation, alc658 Datasheet - Page 47

• Manufacturer Part Number: alc658
• Description: Six-channel Ac?97 2.3 Audio Codec
• Manufacturer: Realtek Semiconductor Corporation

9.5. Odd Addressed Register Access
The ALC658 will return ‘0000h’ when odd-addressed and unimplemented registers are read.
9.6. Power Down Mode
For power saving reasons, it is important to pay special attention to the power down control register (index 26h), especially
PR4 (power down AC-link).
9.7. Test Mode
To provide compatibility with AC’97 rev2.2, the ALC658 will float its digital output pins in both ATE and Vendor-Specific
test modes. Refer to AC’97 rev 2.2 section 9.2 for a detailed description of the test modes.
9.7.1.
SDATA_OUT is sampled high at the trailing edge of RESET#. In this mode, the ALC658 will drive BIT_CLK, SDATA_IN,
EAPD, and S/PDIFO to high impedance.
9.7.2.
Vendor Specific Test mode is no longer supported.
Six-Channel AC’97 2.3 Audio Codec
ATE in Circuit Test Mode
Vendor Specific Test Mode
Normal
PR0=0
PR0=1
ADCs off
Codec Ready
PRI/J/K=1
PRI/J/K=0
PR1=1
PR1=0
Figure 83. Power Down Control
DACs off
PR2=1
PR3=1
PR2=0
PR3=1
43
Vref on/off
Mixer off
Default
PR4=1
Warm Reset
Digital I/F
off
Cold Reset
AC-LINK
Shut off
Datasheet
ALC658
Rev. 1.3