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CS8406 데이터시트(PDF) 7 Page - Cirrus Logic |
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CS8406 데이터시트(HTML) 7 Page - Cirrus Logic |
7 / 42 page DS580F5 7 CS8406 SWITCHING CHARACTERISTICS - CONTROL PORT - SPI MODE (Inputs: Logic 0 = 0 V, Logic 1 = VL; CL = 20 pF) Notes: 9. If Fs is lower than 51.850 kHz, the maximum CCLK frequency should be less than 115 Fs. This is dic- tated by the timing requirements necessary to access the Channel Status and User Bit buffer memory. Access to the control register file can be carried out at the full 6 MHz rate. 10. Tsch must be greater than the larger of the two values, either 1/256FS + 8 ns, or 66 ns. 11. Data must be held for sufficient time to bridge the transition time of CCLK. 12. For fsck < 1 MHz. Parameter Symbol Min Typ Max Units CCLK Clock Frequency (Note 9) fsck 0- 6.0 MHz CS High Time Between Transmissions tcsh 1.0 - - μs CS Falling to CCLK Edge tcss 20 - - ns CCLK Low Time tscl 66 - - ns CCLK High Time (Note 10) tsch MAX ((1/256 FS + 8), 66) ns CDIN to CCLK Rising Setup Time tdsu 40 - - ns CCLK Rising to DATA Hold Time (Note 11) tdh 15 - - ns CCLK Falling to CDOUT Stable tpd -- 50 ns Rise Time of CDOUT tr1 -- 25 ns Fall Time of CDOUT tf1 -- 25 ns Rise Time of CCLK and CDIN (Note 12) tr2 -- 100 ns Fall Time of CCLK and CDIN (Note 12) tf2 -- 100 ns t r2 t f2 t dsu t dh t sch t scl CS CCLK CDIN t css t pd CDOUT t csh Figure 3. SPI Mode Timing |
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