TDM Protocolos compatibles

Audio

Time Division Multiplexing

¿Qué es TDM?

TDM (Time Division Multiplexing) is a multi-channel audio transport scheme that carries multiple audio channels on a single serial data line by assigning each channel to a specific time slot within a repeating frame. TDM is used in professional audio systems, telecommunications equipment, audio DSP arrays, and multi-codec architectures where more than two audio channels must share a bus. The interface typically uses CLK, SYNC (frame sync), and one or more DATA lines, with frame sizes ranging from 2 to 32 or more time slots. Engineers debugging TDM buses need to verify time-slot assignments, frame sync alignment, clock accuracy, and data integrity across all active channels.

TDM Referencia rápida

type	Serial, synchronous
signals	CLK, SYNC, DATA
max Speed	Up to 24.576 MHz
voltage Range	1.8V – 3.3V
features	Multi-channel audio

Instrumentos Acute compatibles con TDM

Soluciones recomendadas

Recomendado para decodificación

TB3016F

Con canales analógicos

MSO2116E

Todos los productos compatibles

Decodificación de protocolo

Disparo por hardware

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¿Cómo analizar TDM con instrumentos Acute

Conecte su analizador lógico Acute a las lineas TDM CLK, SYNC y DATA.

Conecte un cable de tierra a la referencia de tierra de la placa objetivo.

En el software Acute, seleccione el TDM protocol decoder y asigne cada señal al canal de entrada correspondiente.

Configure el número de time slots per frame, bit depth per slot, and frame sync polarity.

Capture y visualice los audio data for each time slot, verifying correct channel-to-slot mapping and frame alignment.

Preguntas frecuentes

Que tasa de muestreo se necesita para el análisis TDM ?

TDM bit clocks can be high — a 32-slot, 32-bit, 48 kHz TDM frame requires a 49.152 MHz bit clock. Sample at a minimum of 4x the TDM bit clock frequency. For a 24.576 MHz clock, use at least 100 MHz sampling. los analizadores lógicos Acute with up to 2 GHz timing analysis handle even the fastest TDM configurations.

Por que algunos slots de tiempo TDM muestran datos de audio incorrectos o faltantes?

Incorrect slot data usually indicates a frame sync misalignment or an incorrect slot count configuration in either the decoder or the hardware. If the frame sync edge is not aligned with the expected first bit of slot 0, all subsequent slot boundaries will be shifted. Verify the frame sync polarity and delay settings, and confirm that both the transmitter and receiver agree on the number of slots and bits per slot.

Cuantos canales necesito para el análisis de TDM ?

TDM requires a minimum of 3 channels: CLK, SYNC, and DATA. If your design uses multiple data lines (e.g., one for each direction or to double the slot count), add one channel per additional data line. Most TDM configurations can be fully analyzed with 3 to 5 logic analyzer channels.

Protocolos relacionados

I2S PCM

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