alc203-lf Realtek Semiconductor Corporation, alc203-lf Datasheet - Page 40

• Manufacturer Part Number: alc203-lf
• Description: Two-channel Ac?97 2.3 Audio Codec
• Manufacturer: Realtek Semiconductor Corporation

9.3 Reset
There are 3 types of reset operations: Cold, Register, and Warm.
Cold
Register
Warm
The AC97 controller should drive SYNC and SDATA_OUT low during the period of RESET# assertion to guarantee that the
ALC203 has reset successfully.
9.4 CD Input
It is important to pay attention to differential CD input. Below is an example of differential CD input.
9.5 Odd Addressed Register Access
The ALC203 will return “0000h” when odd-addressed and unimplemented registers are read.
9.6 Power-down Mode
It is important to pay special attention to the power down control register (index 26h), especially PR4 (powerdown AC-link).
9.7 Test Mode
To provide compatibility with AC’97 rev2.2, the ALC203 will float its digital output pins in both ATE and Vendor-Specific test
modes. Please refer to AC’97 rev2.2 section 9.2 for a detailed description of the test modes.
9.7.1 ATE In Circuit Test Mode
SDATA_OUT is sampled high at the trailing edge of RESET#. In this mode, the ALC203 will drive BIT_CLK, SDATA_IN,
EAPD and SPDIFO to high impedance.
9.7.2 Vendor Specific Test Mode
The Vendor Specific Test mode is no longer supported.
Two-Channel AC’97 2.3 Audio Codec
Reset Type
Assert RESET# for a specified period
Write register indexed 00h
Driven SYNC high for specified period without
BIT_CLK
Trigger condition
Example of differential CD input
36
Reset all hardware logic and all registers to its default
value.
Reset all registers to its default value.
Reactivates AC-LINK, no change to register values.
CODEC response
ALC203 DataSheet
Rev1.6