A practical example
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A detailed walkthrough of VHDL coding for a CPLD-based data acquisition engine. Covers translating hardware requirements into a working state machine, implementing an internal SPI peripheral latch, generating I2S clocking signals (LRCK and BCK) for a PCM1870 ADC, and routing ADC data to an nvSRAM via SPI. Uses two counter-based timing mechanisms (seqCount and CycleCnt) to drive all signal generation. Explains each state in the acquisition engine state diagram and the sequential logic for output signals including SPI SCK gating and nvSRAM chip select control.
