Audio Codec '97 Revision 2.1

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AC ‘97 Component Specification Revision 2.1 9.2.2 Clocks AC ’97 2.1 Appendix D updates DC and AC characteristics. Chapter 9 should NOT be used for new designs. (50pF external load) BIT_CLK SYNC T sync_high T clk_high T clk_period 52 T clk_low T sync_low T sync_period Figure 21. BIT_CLK to SYNC timing diagram Parameter Symbol Min Typ Max Units BIT_CLK frequency - 12.288 - MHz BIT_CLK period Tclk_period - 81.4 - ns BIT_CLK output jitter - - 750 ps BIT_CLK high pulse width (note 1) Tclk_high 32.56 40.7 48.84 ns BIT_CLK low pulse width (note 1) Tclk_low 32.56 40.7 48.84 ns SYNC frequency - 48.0 - kHz SYNC period Tsync_period - 20.8 - us SYNC high pulse width Tsync_high - 1.3 - us SYNC low pulse width Tsync_low - 19.5 - us Notes: 1) Worst case duty cycle restricted to 40/60. Table 25. BIT_CLK to SYNC timing parameters May 22, 1998
AC ‘97 Component Specification Revision 2.1 9.2.3 Data Setup And Hold AC ’97 2.1 Appendix D updates DC and AC characteristics. Chapter 9 should NOT be used for new designs. (50pF external load) BIT_CLK SYNC, SDATA_OUT T setup T hold Figure 22. Data setup and hold timing diagram Parameter Symbol Min Typ Max Units Setup to falling edge of BIT_CLK Tsetup 15.0 - - ns Hold from falling edge of BIT_CLK Thold 5.0 - - ns Table 26. Data setup and hold timing parameters Note 1: Setup and hold time parameters for SDATA_IN are with respect to the AC ‘97 Controller. 9.2.4 Signal Rise and Fall Times AC ’97 2.1 Appendix D updates DC and AC characteristics. Chapter 9 should NOT be used for new designs. (50pF external load; from 10% to 90% of Vdd) BIT_CLK SYNC SDATA_IN SDATA_OUT Trise clk Trise sync Trise din Trise dout 53 Tfall clk Tfall sync Tfall din Tfall dout Figure 23. Signal rise and fall times diagram Parameter Symbol Min Typ Max Units BIT_CLK rise time Triseclk 2 - 6 ns BIT_CLK fall time Tfallclk 2 - 6 ns SYNC rise time Trisesync 2 - 6 ns SYNC fall time Tfallsync 2 - 6 ns SDATA_IN rise time Trisedin 2 - 6 ns SDATA_IN fall time Tfalldin 2 - 6 ns SDATA_OUT rise time Trisedout 2 - 6 ns SDATA_OUT fall time Tfalldout 2 - 6 ns Table 27. Signal rise and fall times parameters May 22, 1998
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Audio Codec '97 Revision 2.1

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