synapse_dynamics_stdp_mad_impl.c File Reference

STDP core implementation. More...

#include "post_events.h"
#include "synapse_dynamics_stdp_common.h"

Go to the source code of this file.

Data Structures
struct	synapse_row_plastic_data_t
	The format of the plastic data region of a synaptic row. More...

Functions
static final_state_t	plasticity_update_synapse (const uint32_t time, const uint32_t last_pre_time, const pre_trace_t last_pre_trace, const pre_trace_t new_pre_trace, const uint32_t delay_dendritic, const uint32_t delay_axonal, update_state_t current_state, const post_event_history_t *post_event_history)
	Synapse update loop core. More...
bool	synapse_dynamics_initialise (address_t address, uint32_t n_neurons, uint32_t n_synapse_types, uint32_t *ring_buffer_to_input_buffer_left_shifts)
	Initialise the synapse dynamics. More...
void	synapse_dynamics_print_plastic_synapses (synapse_row_plastic_data_t *plastic_region_data, synapse_row_fixed_part_t *fixed_region, uint32_t *ring_buffer_to_input_buffer_left_shifts)
	Print the synapse dynamics. More...
static index_t	sparse_axonal_delay (uint32_t x)
	Get the axonal delay. More...
void	synapse_dynamics_process_post_synaptic_event (uint32_t time, index_t neuron_index)
	Inform the synapses that the neuron fired. More...
static plastic_synapse_t	process_plastic_synapse (uint32_t control_word, uint32_t last_pre_time, pre_trace_t last_pre_trace, pre_trace_t new_pre_trace, weight_t *ring_buffers, uint32_t time, uint32_t colour_delay, plastic_synapse_t synapse)
bool	synapse_dynamics_process_plastic_synapses (synapse_row_plastic_data_t *plastic_region_address, synapse_row_fixed_part_t *fixed_region, weight_t *ring_buffers, uint32_t time, uint32_t colour_delay, bool *write_back)
	Process the dynamics of the synapses. More...
bool	synapse_dynamics_find_neuron (uint32_t id, synaptic_row_t row, weight_t *weight, uint16_t *delay, uint32_t *offset, uint32_t *synapse_type)
	Search the synaptic row for the the connection with the specified post-synaptic ID. More...
bool	synapse_dynamics_remove_neuron (uint32_t offset, synaptic_row_t row)
	Remove the entry at the specified offset in the synaptic row. More...
bool	synapse_dynamics_add_neuron (uint32_t id, synaptic_row_t row, weight_t weight, uint32_t delay, uint32_t type)
	Add an entry in the synaptic row. More...

Variables
uint32_t	skipped_synapses

Detailed Description

STDP core implementation.

Definition in file synapse_dynamics_stdp_mad_impl.c.

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Data Structure Documentation

synapse_row_plastic_data_t

struct synapse_row_plastic_data_t

The format of the plastic data region of a synaptic row.

Definition at line 45 of file synapse_dynamics_stdp_izhikevich_neuromodulation.c.

Data Fields
union synapse_row_plastic_data_t	__unnamed__
pre_event_history_t	history	The pre-event history.
plastic_synapse_t	synapses[]	The per-synapse information.
uint32_t	pre_spike: 31
uint32_t	is_update: 1
updatable_synapse_t	synapses[]

Function Documentation

plasticity_update_synapse()

static final_state_t plasticity_update_synapse ( const uint32_t  time, const uint32_t  last_pre_time, const pre_trace_t  last_pre_trace, const pre_trace_t  new_pre_trace, const uint32_t  delay_dendritic, const uint32_t  delay_axonal, update_state_t  current_state, const post_event_history_t *  post_event_history  )

inlinestatic

Synapse update loop core.

Parameters

[in]	time	The current time
[in]	last_pre_time	The time of the last previous pre-event
[in]	last_pre_trace	The last previous pre-trace
[in]	new_pre_trace	The new pre-trace
[in]	delay_dendritic	The dendritic delay for the synapse
[in]	delay_axonal	The axonal delay for the synapse
[in]	current_state	The current state
[in]	post_event_history	The history

Returns

The new basic state of the synapse

Definition at line 43 of file synapse_dynamics_stdp_mad_impl.c.

synapse_dynamics_initialise()

bool synapse_dynamics_initialise	(	address_t	address,
		uint32_t	n_neurons,
		uint32_t	n_synapse_types,
		uint32_t *	ring_buffer_to_input_buffer_left_shifts
	)

Initialise the synapse dynamics.

Parameters

[in]	address	Where the configuration data is
[in]	n_neurons	Number of neurons
[in]	n_synapse_types	Number of synapse types
[in]	ring_buffer_to_input_buffer_left_shifts	How to interpret the values from the ring buffers

Returns

Whether the initialisation succeeded.

Definition at line 105 of file synapse_dynamics_stdp_mad_impl.c.

synapse_dynamics_print_plastic_synapses()

void synapse_dynamics_print_plastic_synapses	(	synapse_row_plastic_data_t *	plastic_region_data,
		synapse_row_fixed_part_t *	fixed_region,
		uint32_t *	ring_buffer_to_input_buffer_left_shifts
	)

Print the synapse dynamics.

Parameters

[in]	plastic_region_data	Where the plastic data is
[in]	fixed_region	Where the fixed data is
[in]	ring_buffer_to_input_buffer_left_shifts	How to interpret the values from the ring buffers

Definition at line 125 of file synapse_dynamics_stdp_mad_impl.c.

sparse_axonal_delay()

static index_t sparse_axonal_delay ( uint32_t  x )

inlinestatic

Get the axonal delay.

Parameters

[in]

x

The packed plastic synapse control word

Returns

the axonal delay

Definition at line 171 of file synapse_dynamics_stdp_mad_impl.c.

synapse_dynamics_process_post_synaptic_event()

void synapse_dynamics_process_post_synaptic_event	(	uint32_t	time,
		index_t	neuron_index
	)

Inform the synapses that the neuron fired.

Parameters

[in]	time	The current simulation time
[in]	neuron_index	Which neuron are we processing

Definition at line 182 of file synapse_dynamics_stdp_mad_impl.c.

synapse_dynamics_process_plastic_synapses()

bool synapse_dynamics_process_plastic_synapses	(	synapse_row_plastic_data_t *	plastic_region_data,
		synapse_row_fixed_part_t *	fixed_region,
		weight_t *	ring_buffers,
		uint32_t	time,
		uint32_t	colour_delay,
		bool *	write_back
	)

Process the dynamics of the synapses.

Parameters

[in,out]	plastic_region_data	Where the plastic data is
[in]	fixed_region	Where the fixed data is
[in,out]	ring_buffers	The ring buffers
[in]	time	The current simulation time
[out]	Whether	to write back anything

Returns

Whether the processing was successful or not

Definition at line 228 of file synapse_dynamics_stdp_mad_impl.c.

synapse_dynamics_find_neuron()

bool synapse_dynamics_find_neuron	(	uint32_t	id,
		synaptic_row_t	row,
		weight_t *	weight,
		uint16_t *	delay,
		uint32_t *	offset,
		uint32_t *	synapse_type
	)

Search the synaptic row for the the connection with the specified post-synaptic ID.

Parameters

[in]	id	the (core-local) ID of the neuron to search for in the synaptic row
[in]	row	the core-local address of the synaptic row
[out]	weight	address to contain the weight of the connection
[out]	delay	address to contain the delay of the connection
[out]	offset	address to contain the offset of the connection
[out]	synapse_type	the synapse type of the connection

Returns

was the search successful?

Definition at line 266 of file synapse_dynamics_stdp_mad_impl.c.

synapse_dynamics_remove_neuron()

bool synapse_dynamics_remove_neuron	(	uint32_t	offset,
		synaptic_row_t	row
	)

Remove the entry at the specified offset in the synaptic row.

Parameters

[in]	offset	the offset in the row at which to remove the entry
[in]	row	the core-local address of the synaptic row

Returns

was the removal successful?

Definition at line 297 of file synapse_dynamics_stdp_mad_impl.c.

synapse_dynamics_add_neuron()

bool synapse_dynamics_add_neuron	(	uint32_t	id,
		synaptic_row_t	row,
		weight_t	weight,
		uint32_t	delay,
		uint32_t	type
	)

Add an entry in the synaptic row.

Parameters

[in]	id	the (core-local) ID of the post-synaptic neuron to be added
[in]	row	the core-local address of the synaptic row
[in]	weight	the initial weight associated with the connection
[in]	delay	the delay associated with the connection
[in]	type	the type of the connection (e.g. inhibitory)

Returns

was the addition successful?

Definition at line 318 of file synapse_dynamics_stdp_mad_impl.c.

Variable Documentation

skipped_synapses

uint32_t skipped_synapses

extern

Count of the synapses that have been skipped because the delay wasn't big enough given how long the spike took to arrive

Definition at line 84 of file synapses.c.