LM4549B datasheet(27/28 Pages) NSC

부품명	LM4549B

상세설명	AC ??7 Rev 2.1 Multi-Channel Audio Codec with Sample Rate Conversion and National 3D Sound

PDF	28 Pages

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제조업체	NSC [National Semiconductor (TI)]

홈페이지	http://www.national.com

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Multiple Codecs (Continued)

Test Modes

AC ’97 Rev 2.1 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

sampled high by the trailing edge (zero-to-one transition) of

RESET#. In ATE test mode the codec AC Link outputs

SDATA_IN and BIT_CLK are configured to a high imped-

ance state to allow tester control of the AC Link interface 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.

20123523

FIGURE 9. Multiple Codecs using Extended AC Link

LM4549B 데이터시트(PDF) 27 Page - National Semiconductor (TI)