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TLC320AD90CPM Datasheet(PDF) 48 Page - Texas Instruments |
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TLC320AD90CPM Datasheet(HTML) 48 Page - Texas Instruments |
48 / 51 page 5–2 5.2 The Texas Instruments TLC320AD90C Connected to an AC‘97 Compliant Digital Controller The TLC320AD90C communicates with an AC‘97 compliant digital controller through the digital serial link or AC-Link. In addition to all digital audio streams, command and status information is also communicated over this point-to-point serial connection. This connection is shown in Figure 5–2. AC’97 Compliant Digital Controller TLC320AC90C SYNC BIT_CLK SDATA_OUT SDATA_IN RESET Figure 5–2. Connection to an AC‘97 Digital Controller 5.3 Testability 5.3.1 Activating the Test Modes The TLC320AD90C has two test modes. One mode is for ATE in circuit test and the other mode is for Texas Instruments specific tests. The two test modes are activated according to the following: • The TLC320AD90C enters the ATE in circuit test mode if SDATA_OUT is sampled high at the trailing edge of RESET. • The TLC320AD90C enters the Texas Instruments test mode when coming out of reset if SYNC is high. • The TLC320AD90C enters Texas Instruments Scan Test mode when coming out of RESET when both SYNC and SDATA_OUT are held high. These cases should never occur during standard operating conditions. Regardless of the test mode, the digital controller must issue a cold reset to resume normal operation of the TLC320AD90C. 5.3.2 Test Mode Functions – ATE in Circuit Test Mode When the TLC320AD90C is placed in the ATE test mode, the TLC32AD90C digital AC-Link outputs (i.e., BIT_CLK and SDATA_IN) are driven to a high-impedance state. This condition allows ATE in circuit testing of the digital controller. |
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