Samsung S3C2451X User Manual page 671

S3C2451X RISC MICROPROCESSOR
26
OVERVIEW
IIS (Inter-IC Sound) is one of the popular digital audio interface. The bus has only to handle audio data, while the
other signals, such as sub-coding and control, are transferred separately. Surely, it is possible to transmit data
between two IIS bus. To minimize the number of pins required and to keep wiring simple, basically, a 3-line serial
bus is used consisting of a line for two time-multiplexed data channels, a word select line and a clock line.
IIS interface transmits or receives sound data from external stereo audio codec. For transmitting and receiving
data, three 32x16 TXFIFOs(First-In-First-Out) and one 32x16 RXFIFO data structures are included and DMA
transfer mode for transmitting or receiving samples can be supported. IIS-specific clock can be supplied from
internal system clock controller through IIS clock divider or direct clock source.
FEATURE
− Up to 5.1ch IIS-bus for audio interface with DMA-based operation
− Serial, 8/16/24 bit per channel data transfers
− Supports IIS, MSB-justified and LSB-justified data format
− Three 32-bit width 16 depth Tx FIFOs, One 32-bit width 16 depth Rx FIFO
SIGNALS
Name
I2SLRCLK
I2SSCLK
I2SCDCLK
I2SSDI
I2SSDO
I2SSDO_1
I2SSDO_2
IIS MULTI AUDIO INTERFACE
Direction
Input/Output IIS Multi Audio channel select(word select) clock
Input/Output IIS Multi Audio serial clock(bit clock)
Input/Output IIS Multi Audio Codec clock
Input
Output
Output
Output
Preliminary product information describe products that are in development,
for which full characterization data and associated errata are not yet available.
Specifications and information herein are subject to change without notice.
Description
IIS Multi Audio serial data input
IIS Multi Audio serial data output 0
IIS Multi Audio serial data output 1
IIS Multi Audio serial data output 2
IIS MULTI AUDIO INTERFACE
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