CYW20704
9.3.1 I2S Timing
Note: Timing values specified in Table 26 are relative to high and low threshold levels.
Table 26. Timing for I2S Transmitters and Receivers
Transmitter
Receiver
Lower Limit Upper Limit
Min Max
Lower LImit
Min Max
Upper Limit
Min Max
Notes
Min
Max
a
Clock Period T
T
–
–
–
T
–
–
–
tr
r
Master Mode: Clock generated by transmitter or receiver
b
b
HIGH tHC
LOWtLC
0.35T
0.35T
–
–
–
–
–
–
0.35T
0.35T
–
–
–
–
–
–
tr
tr
tr
tr
Slave Mode: Clock accepted by transmitter or receiver
c
c
d
HIGH tHC
–
–
–
0.35T
0.35T
–
–
–
–
–
–
–
–
–
0.35T
0.35T
–
–
–
–
–
–
–
tr
tr
tr
tr
LOW tLC
Rise time tRC
0.15T
tr
Transmitter
e
d
Delay tdtr
–
0
–
–
–
–
0.8T
–
–
–
–
–
–
–
–
Hold time thtr
–
Receiver
f
f
Setup time tsr
Hold time thr
–
–
–
–
–
–
–
–
–
–
0.2T
0
–
–
–
–
r
a. The system clock period T must be greater than Ttr and Tr because both the transmitter and receiver have to be able to handle the data
transfer rate.
b. At all data rates in master mode, the transmitter or receiver generates a clock signal with a fixed mark/space ratio. For this reason, tHC and
tLC are specified with respect to T.
c. In slave mode, the transmitter and receiver need a clock signal with minimum HIGH and LOW periods so that they can detect the signal.
So long as the minimum periods are greater than 0.35Tr, any clock that meets the requirements can be used.
d. Because the delay (tdtr) and the maximum transmitter speed (defined by Ttr) are related, a fast transmitter driven by a slow clock edge can
result in tdtr not exceeding tRC which means thtr becomes zero or negative. Therefore, the transmitter has to guarantee that thtr is greater
than or equal to zero, so long as the clock rise-time tRC is not more than tRCmax, where tRCmax is not less than 0.15Ttr.
e. To allow data to be clocked out on a falling edge, the delay is specified with respect to the rising edge of the clock signal and T, always giving
the receiver sufficient setup time.
f.
The data setup and hold time must not be less than the specified receiver setup and hold time.
Note: The time periods specified in Figure 18 and Figure 19 are defined by the transmitter speed. The receiver specifications must
match transmitter performance.
Document Number: 002-14786 Rev. *E
Page 40 of 49
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