STAC9704 Datasheet, PDF (33/49 Pages) Hynix Semiconductor – Multimedia Audio Codec for AC97

SigmaTel, Inc.
STAC9704/7
6. TESTABILITY
The STAC9704/7 has two test modes. One is for ATE in-circuit test and the other is restricted for SigmaTel’s
internal use. STAC9704/7 enters the ATE in circuit test mode if SDATA_OUT is sampled high at the trailing
edge of RESET#. Once in the ATE test mode, the digital AC-link outputs (BIT_CLK and SDATA_IN) are
driven to a high impedance state. This allows ATE in-circuit testing of the AC’97 controller. This case will
never occur during standard operating conditions. Once either of the two test modes have been entered, the
STAC9704/7 must be issued another rest with all AC-link signals held low to return to the normal operating
mode.
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10/02/98