[NEST Users] The buffering mechanism of neurons and synapses in nest

When I check the nest source code, the updates for each neuron are based on the ringbuffer. Its size is max_ Delay.The code defines moduli, whose size should be max as analyzed earlier_ Delay+min_ Delay, But I don't quite understand the mechanism of moduli because it involves the minimum delay of many neuron update steps, the size of ringbuffer, and the size of moduli. Can I see the relevant detailed information there, or can you guide me