PRELIMINARY
CYW43340
Table 14. Timing for I2S Transmitters and Receivers
Transmitter
Lower LImit Upper Limit
Receiver
Lower Limit Upper Limit
Min Max
Notes
Min
Max
Min
Max
Min
Max
Clock Period T
T
–
–
–
T
–
–
–
1
tr
r
Master Mode: Clock generated by transmitter or receiver
High tHC
Low tLC
0.35T
0.35T
–
–
–
–
–
–
0.35T
0.35T
–
–
–
–
–
–
2
2
tr
tr
tr
tr
Slave Mode: Clock accepted by transmitter or receiver
High tHC
–
–
–
0.35T
0.35T
–
–
–
–
–
–
–
–
–
0.35T
0.35T
–
–
–
–
–
–
3
3
4
tr
tr
tr
Low tLC
tr
Rise time tRC
0.15T
tr
Transmitter
Delay tdtr
–
0
–
–
–
–
0.8T
–
–
–
–
–
–
–
–
5
4
Hold time thtr
–
Receiver
Setup time tsr
Hold time thr
–
–
–
–
–
–
–
–
–
–
0.2T
0
–
–
–
–
6
6
r
Note:
■ 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.
■ 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.
■ 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.
■ 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.
■ 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.
■ The data setup and hold time must not be less than the specified receiver setup and hold time.
■ The time periods specified in Figure 17 and Figure 18 on page 33 are defined by the transmitter speed. The receiver specifications
must match transmitter performance.
Document Number: 002-14943 Rev. *L
Page 32 of 96
CYPRESS [ CYPRESS ]
