Adaptive lookup table module with internal feedback
A look-up table, self-adaptive technology, applied in simulators, instruments, computer control, etc., can solve the problem of incomplete m input LUT function, etc., to achieve multi-functional effects
Active Publication Date: 2016-05-11
INST OF ELECTRONICS CHINESE ACAD OF SCI
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[0012] When k is constant, the larger the number of input m, the more incomplete the m-input LUT function realized by the unit
In addition, mapping is an important step in the EDA tool flow corresponding to FPGA, and the existing mapping algorithm has been able to achieve optimal depth
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[0024] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in further detail below in conjunction with specific embodiments and with reference to the accompanying drawings. It should be noted that, in the drawings or descriptions of the specification, similar or identical parts all use the same figure numbers. Implementations not shown or described in the accompanying drawings are forms known to those of ordinary skill in the art. Additionally, while illustrations of parameters including particular values may be provided herein, it should be understood that the parameters need not be exactly equal to the corresponding values, but rather may approximate the corresponding values within acceptable error margins or design constraints. The directional terms mentioned in the embodiments, such as "upper", "lower", "front", "rear", "left", "right", etc., are only referring to the directions of the...
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The invention provides an adaptive lookup table module with internal feedback. The adaptive lookup table module comprises a first lookup table, a second lookup table, a first either-or multiplexer, and a second either-or multiplexer. A first input port of the first either-or multiplexer is connected to an output port of the first lookup table, a second input port of the first either-or multiplexer is connected to an input end [2k-3] of the adaptive lookup table module, and a control port of the first either-or multiplexer is connected to a mode selection end of the adaptive lookup table module. A first input port of the second either-or multiplexer is connected to the output port of the first lookup table, a second input port of the second either-or multiplexer is connected to an output port of the second lookup table, a control port of the second either-or multiplexer is connected to an input end [2k-2] of the adaptive lookup table module, and an output port of the second either-or multiplexer is used as an output end of the adaptive lookup table module. According to the invention, as a multiplexer and a feedback path are added to the existing LUT module, a cascade mode is achieved in addition to the normal mode, and more functions are achieved in the LUT module.
Description
technical field [0001] The invention relates to the technical field of Field Programmable Logic Gate Array (FPGA) in the electronics industry, in particular to an adaptive lookup table module (LookUpTable, LUT for short) with internal feedback. Background technique [0002] The current field programmable logic gate array (FPGA) is mostly an island structure, and its basic units are such as figure 1 shown. 15 is called a logic array block (LogicArrayBlock, referred to as LAB), and LAB includes a plurality of logic elements (LogicElement, referred to as LE) 14, and LE is generally formed by connecting a k-input lookup table (LookUpTable, LUT) 11 and a register 12, A full k-input LUT means 2 k Bit sram (static random access memory) and corresponding address gating logic. Both the output ends of 11 and 12 can be output outside the LAB, up to the channel interconnection structure, and can be connected to other logic resources. Before the input signal from the channel enters t...
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IPC IPC(8): G05B19/042
Inventor 杨海钢林郁贾瑞李天一郭珍红杜方清王飞李威魏金宝
Owner INST OF ELECTRONICS CHINESE ACAD OF SCI