The CDB4923 and CDB49300 customer development boards provide the means to fully evaluate the CS4923/4/5/6/7/8 and CS49300 family of audio decoders. Compressed data can be delivered in IEC61937 format via the S/PDIF port and in bursty mode via the PC interface. PCM data can be accepted through the digital input connectors or from the on-board ADC. Six channels of audio are provided on the six analog outputs and on three optical S/PDIF transmitters. CLKIN for the DSP can be derived either from the on-board oscillator or the external PLL. MCLK can be extracted from incoming S/PDIF streams, generated with the external PLL, or mastered by the audio decoder.