2
BCM4330 Preliminary Data Sheet
I S Interface
Table 13: Timing for I2S Transmitters and Receivers
Transmitter Receiver
Lower LImit Upper Limit Lower Limit Upper Limit
Min
Max
Min
Max
Min
Max
Min
Max
Notes
Clock Period T
Ttr
–
–
–
Tr
–
–
–
1
Master Mode: Clock generated by transmitter or receiver
HIGH tHC
LOWtLC
0.35Ttr
0.35Ttr
–
–
–
–
–
–
0.35Ttr
0.35Ttr
–
–
–
–
–
–
2
2
Slave Mode: Clock accepted by transmitter or receiver
HIGH tHC
LOW tLC
Rise time tRC
–
–
–
0.35Ttr
0.35Ttr
–
–
–
–
–
–
–
–
–
0.35Ttr
0.35Ttr
–
–
–
–
–
–
3
3
4
0.15Ttr
Transmitter
Delay tdtr
Hold time thtr
–
0
–
–
–
–
0.8T
–
–
–
–
–
–
–
–
–
5
4
Receiver
Setup time tsr
Hold time thr
–
–
–
–
–
–
–
–
–
–
0.2Tr
0
–
–
–
–
6
6
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.
Note: The time periods specified in Figure 19 and Figure 20 are defined by the transmitter speed. The
receiver specifications must match transmitter performance.
®
BROADCOM
BCM4330 Preliminary Data Sheet
April 28, 2011 • 4330-DS304-RI
Page 64
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