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LM3S5D91 Datasheet, PDF (829/1340 Pages) Texas Instruments – Stellaris® LM3S5D91 Microcontroller | |||
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Stellaris® LM3S5D91 Microcontroller
16 Inter-Integrated Circuit Sound (I2S) Interface
The I2S module is a configurable serial audio core that contains a transmit module and a receive
module. The module is configurable for the I2S as well as Left-Justified and Right-Justified serial
audio formats. Data can be in one of four modes: Stereo, Mono, Compact 16-bit Stereo and Compact
8-Bit Stereo.
The transmit and receive modules each have an 8-entry audio-sample FIFO. An audio sample can
consist of a Left and Right Stereo sample, a Mono sample, or a Left and Right Compact Stereo
sample. In Compact 16-Bit Stereo, each FIFO entry contains both the 16-bit left and 16-bit right
samples, allowing efficient data transfers and requiring less memory space. In Compact 8-bit Stereo,
each FIFO entry contains an 8-bit left and an 8-bit right sample, reducing memory requirements
further.
Both the transmitter and receiver are capable of being a master or a slave.
The Stellaris® I2S module has the following features:
â Configurable audio format supporting I2S, Left-justification, and Right-justification
â Configurable sample size from 8 to 32 bits
â Mono and Stereo support
â 8-, 16-, and 32-bit FIFO interface for packing memory
â Independent transmit and receive 8-entry FIFOs
â Configurable FIFO-level interrupt and µDMA requests
â Independent transmit and receive MCLK direction control
â Transmit and receive internal MCLK sources
â Independent transmit and receive control for serial clock and word select
â MCLK and SCLK can be independently set to master or slave
â Configurable transmit zero or last sample when FIFO empty
â Efficient transfers using Micro Direct Memory Access Controller (µDMA)
â Separate channels for transmit and receive
â Burst requests
â Channel requests asserted when FIFO contains required amount of data
January 22, 2012
829
Texas Instruments-Production Data
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