Samsung S3C2451X User Manual page 651

S3C2451X RISC MICROPROCESSOR
25
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, two 32x16 FIFOs (First-In-First-Out) 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
− 2-ch 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
− 32-bit width 16depth Tx FIFO, 32-bit width 16depth Rx FIFO
SIGNALS
Name
I2S1_LRCLK
I2S1_SCLK
I2S1_CDCLK
I2S1_SDI
I2S1_SDO
IIS-BUS INTERFACE
Direction
Input/Output IIS-Bus Audio channel select(word select) clock
Input/Output IIS-Bus Audio serial clock(bit clock)
Input/Output IIS-Bus Audio Codec clock
Input
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-Bus Audio serial data input
IIS-Bus Audio serial data output
IIS-BUS INTERFACE
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