Datasheet

6.8.10 I
2
S switching specifications
This section provides the AC timings for the I
2
S in master (clocks driven) and slave
modes (clocks input). All timings are given for non-inverted serial clock polarity
(TCR[TSCKP] = 0, RCR[RSCKP] = 0) and a non-inverted frame sync (TCR[TFSI] = 0,
RCR[RFSI] = 0). If the polarity of the clock and/or the frame sync have been inverted, all
the timings remain valid by inverting the clock signal (I2S_BCLK) and/or the frame sync
(I2S_FS) shown in the figures below.
Table 46. I
2
S master mode timing (limited voltage range)
Num Description Min. Max. Unit
Operating voltage 2.7 3.6 V
S1 I2S_MCLK cycle time 2 x t
SYS
ns
S2 I2S_MCLK pulse width high/low 45% 55% MCLK period
S3 I2S_BCLK cycle time 5 x t
SYS
— ns
S4 I2S_BCLK pulse width high/low 45% 55% BCLK period
S5 I2S_BCLK to I2S_FS output valid — 15 ns
S6 I2S_BCLK to I2S_FS output invalid -2.5 — ns
S7 I2S_BCLK to I2S_TXD valid — 15 ns
S8 I2S_BCLK to I2S_TXD invalid -3 — ns
S9 I2S_RXD/I2S_FS input setup before I2S_BCLK 20 — ns
S10 I2S_RXD/I2S_FS input hold after I2S_BCLK 0 — ns
S1 S2 S2
S3
S4
S4
S5
S9
S7
S9 S10
S7
S8
S6
S10
S8
I2S_MCLK (output)
I2S_BCLK (output)
I2S_FS (output)
I2S_FS (input)
I2S_TXD
I2S_RXD
Figure 25. I
2
S timing — master mode
Peripheral operating requirements and behaviors
K20 Sub-Family Data Sheet Data Sheet, Rev. 7, 02/2013.
Freescale Semiconductor, Inc. 61