系数RAM访问机制

　　Introduction For clarity， this application report organizes several devices into two families that share a common coefficient RAM （C-RAM） access mechanism：

　　• Family 1： – TSC2117 – TLV320AIC3111 – TLV320AIC3100 – TLV320AIC3120 – TLV320DAC3120 – TLV320DAC3101 – TLV320DAC3100 – TLV320AIC36 – TLV320ADC3101 – TLV320ADC3001

　　• Family 2： – TLV320AIC3254 – TLV320AIC3204 – TLV320AIC3253 – TLV320AIC3256

　　Note that some features do not apply to some devices within a family. For instance， the TLV320ADC3101 does not have digital-to-analog converter （DAC） channels， therefore， any mention of DAC channel filtering does not apply for this device. In a similar fashion， the TLV320AIC3204 does not have a programmable miniDSP， therefore， any miniDSP mention does not apply for this device. Although the C-RAM access mechanism can be the same， some devices differ on the C-RAM size and word length. The following conventions are used throughout this document： • miniDSP_D – miniDSP associated with the DAC channel. • miniDSP_A – miniDSP associated with the analog-to-digital converter （ADC） channel. • PRB_Px – DAC processing block x， where x denotes any processing block for playback. • PRB_Ry – ADC processing block y， where y denotes any processing block for recording. • DAC（s） – it means that a statement applies if an action is performed to one or both DACs. • DACs – it means that a statement applies if an action is performed to both DACs. • ADC（s） – it means that a statement applies if an action is performed to one or both ADCs. • ADCs – it means that a statement applies if an action is performed to both ADCs. • Page X or Page Y – X refers to the first page of DAC Buffer A whereas Y refers to the first page of ADC Buffer A.