Here is a list of all documented struct and union fields with links to the struct/union documentation for each field:

c_m : neuron_params_t
clear_input_buffer : local_only_config
clear_packets : delay_parameters
colour : dma_buffer
colour_mask : dma_buffer
colour_shift : key_config
continue_if_not_different : motor_control_config_t
core_mask : key_info, master_population_table_entry
core_params : neuron_regions
cores : source_dim
cores_per_source_height : source_info
cores_per_source_width : source_info
cores_per_width_div : source_info
count : key_info, master_population_table_entry, post_event_history_t, source_expand_details
count_input_buffer_packets_late : delay_extension_provenance
count_minus_one : post_event_history_t
cum_cores : source_dim
cum_cores_div : source_dim
cum_size_last_core : source_dim
cum_size_last_core_div : source_dim
cum_size_per_core : source_dim
cum_size_per_core_div : source_dim
current_source_params : neuron_regions
current_timer_tick : neuron_provenance