Dynamically reconfigurable silicon array of spiking neurons with conductance-based synapses
Dynamically reconfigurable silicon array of spiking neurons with conductance-based synapses
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DOI：
10.1109/tnn.2006.883007
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发表时间：
2007-01-01
影响因子：
--
通讯作者：
Cauwenberghs, Gert
中科院分区：
文献类型：
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作者：
Vogelstein, R. Jacob;Mallik, Udayan;Cauwenberghs, Gert
提出了一种用于大规模尖峰神经网络仿真的混合信号超大规模集成电路芯片。该芯片包含2400个具有完全可编程和可重新配置的突触连接的硅神经元。每个神经元实现一个单室细胞的离散时间模型。该模型允许模拟膜动力学和任意数量的突触连接，每个突触连接具有可调的电导和反转电位。硅片阵列。神经元起到地址-事件(AE)收发器的作用，传入和传出尖峰信号通过异步事件驱动的数字总线进行通信。尖峰事件的地址编码和冲突解决是通过随机仲裁方案实现的，该方案确保了跨阵列的事件请求的平衡服务。事件的路由是使用存储每个突触连接的突触后地址、电导和反转电位的动态可编程随机存取存储器在外部实现的。在这里，我们描述了硅神经元电路，给出了用0.5微米互补金属氧化物半导体(CMOS)工艺制造的3 mm×3 mm芯片的实验数据，并通过配置硬件来模拟大鼠海马区睡眠期间的吸引子动力学和神经活动波的模型，展示了其实用性。
A mixed-signal very large scale integration (VLSI) chip for large scale emulation of spiking neural networks is presented. The chip contains 2400 silicon neurons with fully programmable and reconfigurable synaptic connectivity. Each neuron implements a discrete-time model of a single-compartment cell. The model allows for analog membrane dynamics and an arbitrary number of synaptic connections, each with tunable conductance and reversal potential. The array of silicon. neurons functions as an address-event (AE) transceiver, with incoming and outgoing spikes communicated over an asynchronous event-driven digital bus. Address encoding and conflict resolution of spiking events are implemented via a randomized arbitration scheme that ensures balanced servicing of event requests across the array. Routing of events is implemented externally using dynamically programmable random-access memory that stores a postsynaptic address, the conductance, and the reversal potential of each synaptic connection. Here, we describe the silicon neuron circuits, present experimental data characterizing the 3 mm x 3 mm chip fabricated in 0.5-mu m complementary metal-oxide-semiconductor (CMOS) technology, and demonstrate its utility by configuring the hardware to emulate a model of attractor dynamics and waves of neural activity during sleep in rat hippocampus.