The phase generator circuit is also associated with each of the 8 sections. Internal muxing circuits will allow flexibility in interconnecting the correlator sections. This is the Mark IV digital correlator board in use at MIT Haystack Observatory. It utilizes 32 VLSI chips and allows over 16,000 real lags to be computed at a rate of 64 million samples per second. At the end of an integration period the data in the accumulators is parallel-loaded into 1024 output registers.
New integration can begin immediately.
The chip supports data multiplexing and all control signals are passed through the chip, to simplify cascading. Narrow Band Auto Correlator for the JPL Microwave LIMB Sounder was delivered in November 1991. The inputs are 2-bit data words. Data can be output at a 10 MHz data rate. The processor contains 1024 independent correlators and consumes 2 watts while operating at 100 MHz.