Iis Multi Audio Interface; Overview Of Iis Multi Audio Interface; Key Features Of Iis Multi Audio Interface - Samsung S5PC110 Manual

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IIS MULTI AUDIO INTERFACE

2.1 OVERVIEW OF IIS MULTI AUDIO INTERFACE

Inter-IC Sound (IIS) is one of the popular digital audio interface. The IIS bus handles audio data and the other
signals, namely, sub-coding and control, are transferred separately. 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. This
consists 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. To transmit and receive data,
32bitsx64 FIFOs (First-In-First-Out) for each channel are included and DMA transfer mode to transmit and receive
samples can be supported. IIS-specific clock can be supplied from internal system clock controller through IIS
clock divider or direct clock source.
IIS V5.1 can handle up to 2 sound sources. For example, OS (Operating Sound)-controlled sound can be
delivered to primary sound path and OS-independent sound can be delivered to secondary sound path. IIS V5.1
can mix primary sound source and secondary sound source.

2.2 KEY FEATURES OF IIS MULTI AUDIO INTERFACE

• Mixes up to two sound sources: Primary and Secondary sound source.
• Primary sound source can drive up to 5.1ch IIS-bus for audio interface with external DMA-based operation
• Secondary sound source can support stereo sound channels with internal DMA
• Serial, 8/16/24-bit per channel data transfers
• Supports IIS, MSB-justified and LSB-justified data format
• IIS v5.1 interrupt can wake-up system from IDLE and DEEP_IDLE mode.
• Master /slave mode support
• Auxiliary clock out support for codec chip
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