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CS8412 Datasheet(PDF) 5 Page - Cirrus Logic |
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CS8412 Datasheet(HTML) 5 Page - Cirrus Logic |
5 / 38 page CS8411 CS8412 DS61F1 5 SWITCHING CHARACTERISTICS - SERIAL PORTS (TA = 25 °C for suffixes '-CP' and '-CS'; TA = -40 to 85 °C for suffixes '-IP' and '-IS'; VD+, VA+ = 5V ± 10%; Inputs: Logic 0 = DGND, logic 1 = VD+; CL = 20 pF) 6. The output word rate, OWR, refers to the frequency at which an audio sample is output from the part. (A stereo pair is two audio samples.) Therefore, in Master mode, there are always 32 SCK periods in one audio sample. In Slave mode, exactly 32 SCK periods per audio sample must be provided in most serial port formats. Therefor, if SCK is 128 x Fs, then SCK must be gated to provide exactly 32 periods per audio sample. 7. In master mode SCK and FSYNC are outputs. In Slave mode they are inputs. In the CS8411, control reg. 2 bit 1, MSTR, selects master. In the CS8412, formats 1, 3 and 9 are slaves. 8. The table above assumes data is output on the falling edge and latched on the rising edge. With the CS8411 the edge is selectable. The table is defined for the CS8411 with control reg. 2 bit 0, SCED, set to one, and for the CS8412 in formats 2, 3, 5, 6 and 7. For the other formats, the table and figure edges must be reversed (i.e.. "rising" to "falling" and vice versa). Parameter Symbol Min Typ Max Unit SCK Frequency Master Mode Notes 6, 7 Slave Mode Note 7 fsck OWRx32 OWRx32 128xFs Hz Hz SCK falling to FSYNC delay Master Mode Notes 7, 8 tsfdm -20 20 ns SCK Pulse Width Low Slave Mode Note 7 tsckl 40 ns SCK Pulse Width High Slave Mode Note 7 tsckh 40 ns SCK rising to FSYNC edge delay Slave Mode Notes 7,8 tsfds 20 ns FSYNC edge to SCK rising setup Slave Mode Notes 7,8 tfss 20 ns SCK falling (rising) to SDATA valid Note 8 tssv 20 ns C, U, CBL valid to FSYNC edge CS8412 Note 8 tcuvf 1/fsck s MCK to FSYNC edge delay FSYNC from RXN/RXP tmfd 15 ns sfds t ssv t SDATA SCK FSYNC fss t MSB sckh t ssv t sckl t SDATA SCK FSYNC MSB (Mode 1) (Mode 3) sfdm t ssv t cuvf t SDATA SCK FSYNC C, U Serial Output Timing - Slave Mode Serial Output Timing - Master Mode & C, U Port FSYNC Generated From Received Data FSYNC mfd t MCK fss t sfds t sckh t sckl t SCK (Modes 2,3,5,6, 7,10,12, and 13) (Modes 0,1,4, 8,9, and 11) |
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