LM4546AVH NSC [National Semiconductor], LM4546AVH Datasheet - Page 25

• Manufacturer Part Number: LM4546AVH
• Description: AC 97 Rev 2 Multi-Channel Audio Codec with Sample Rate Conversion and National 3D Sound
• Manufacturer: NSC [National Semiconductor]

Extended Audio ID register (28h): Support for Multiple Codecs
Test Modes
AC '97 Rev 2 defines two test modes: ATE test mode and
Vendor test mode. Cold Reset is the only way to exit either of
them. The ATE test mode is activated if SDATA_OUT is sam-
pled high by the trailing edge (zero-to-one transition) of RE-
SET#. In ATE test mode the codec AC Link outputs
SDATA_IN and BIT_CLK are then configured to a high
impedance state to allow tester control of the AC Link inter-
Reg
28h
Extended
Audio ID
Name
D15 D14 D13 D12 D11 D10
ID1
ID0
X
200308 Version 5 Revision 1
FIGURE 9. Multiple Codecs using Extended AC Link
X
X
X
D9
X
Print Date/Time: 2009/07/15 15:26:52
25
D8
X
face for controller testing. ATE test mode timing parameters
are given in the Electrical Characteristics table. The Vendor
test mode is entered if SYNC is sampled high by the zero-to-
one transition of RESET#. Neither of these entry conditions
can occur in normal AC Link operation but care must be taken
to avoid mistaken activation of the test modes when using non
standard controllers.
D7
X
D6
X
D5
X
D4
X
D3
X
D2
X
20030823
D1
X
VRA
D0
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