27-1
MB86R02 ‘Jade-D’ Hardware Manual V1.64
27 Serial Audio Interface (I2S)
This chapter describes function and operation of serial audio interface (hereafter called, I2S.)
27.1 Outline
MB86R02 incorporates a one channel audio I/O interface in I2S format.
Note:
I2S stands for the Inter-IC Sound Bus by Philips Semiconductors (now NXP).
27.2 Features
I2S interface in MB86R02 has following features:
•
Selecting master/slave operations by programmable
•
Supporting state of transmission only, reception only, and simultaneous
transmission/reception
•
Selecting 1 sub frame and 2 sub frame constructions
•
Setting up to 32 channels to each sub frame
•
Individually setting number of channel in each sub frame
•
Individually setting channel length of each sub frame (number channel bit)
•
Individually setting word length in channel of each sub frame
•
Setting valid/invalid of each channel in each sub frame
(Note 1)
•
Setting word length from 7 to 32 bit
•
Programming frequency of frame synchronous signal
•
Setting up to 3071 bit in 1 frame
•
Programming width of frame synchronous signal (1 bit or 1 channel length)
•
Programming phase of frame synchronous signal (0 bits or 1 bit delay)
•
Setting polarity of frame synchronous signal
•
Setting polarity of serial bit clock
•
Programming sampling point of received data
•
Selecting clock frequency dividing source of serial bit clock in the master mode (internal and
external clock.)
•
Setting clock frequency dividing ratio in the master mode
Frequency of I2S_SCLK = frequency of AHB clock (or external clock)/2
×
CKRT[5:0]
Frequency dividing ratio is settable within 0 – 126 in multiple of 2 (when the ratio is 0,
frequency dividing source is by-passed)
•
Data transfer to system memory by DMA (block transfer only, refer to the DMA chapter),
interrupt, and polling
Note 1:
Data is not sent or received to invalid channels
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