关于FPGA最基础的解释 LUT
A LUT, which stands for LookUp Table, in general terms is basically a table that determines what the output is for any given input(s). In the context of combinational logic, it is the truth table. This truth table effectively defines how your combinatorial logic behaves.
In other words, whatever behavior you get by interconnecting any number of gates (like AND, NOR, etc.), without feedback paths (to ensure it is state-less), can be implemented by a LUT.
The way FPGAs typically implement combinatorial logic is with LUTs, and when the FPGA gets configured, it just fills in the table output values, which are called the "LUT-Mask", and is physically composed of SRAM bits. So the same physical LUT can implement Y=AB and Y=AB', but the LUT-Mask is different, since the truth table is different.
You can also create your own lookup tables. For example, you could build a table for a complex mathematical function, which would work much faster than actually calculating the value by following an algorithm. This table would be stored in RAM or ROM.
This brings us to viewing the LUTs simply as memory, where the inputs are the address, and the corresponding outputs are the data stored in the given address.
A LUT, which stands for LookUp Table, in general terms is basically a table that determines what the output is for any given input(s). In the context of combinational logic, it is the truth table. This truth table effectively defines how your combinatorial logic behaves.
In other words, whatever behavior you get by interconnecting any number of gates (like AND, NOR, etc.), without feedback paths (to ensure it is state-less), can be implemented by a LUT.
The way FPGAs typically implement combinatorial logic is with LUTs, and when the FPGA gets configured, it just fills in the table output values, which are called the "LUT-Mask", and is physically composed of SRAM bits. So the same physical LUT can implement Y=AB and Y=AB', but the LUT-Mask is different, since the truth table is different.
You can also create your own lookup tables. For example, you could build a table for a complex mathematical function, which would work much faster than actually calculating the value by following an algorithm. This table would be stored in RAM or ROM.
This brings us to viewing the LUTs simply as memory, where the inputs are the address, and the corresponding outputs are the data stored in the given address.
历史上的8月20日街机“街霸一代”发售。
1987年8月20日 "/>
1987年8月20日，街机街霸一代发售。
游戏中玩家只能选择RYU和KEN两名角色，如果进行对战的话，对战后无论是谁胜出都会直接结束游戏，这个设定实在是太恶了，估计当时CAPCOM的制作人员也并没有意识到对战的乐趣所在，也正因此游戏并没有引发对战的热潮。过于超前的理念和晦涩的操作方式导致本作无法得到广泛认可，不过其中蕴藏的巨大潜力却不容忽视。1988年底，HUDSON将本作作为PC-E CD-ROM2的首发游戏推出；1989年，CAPCOM使用CPS主板制作的经典过关游戏快打旋风也使用了街霸89的宣传名称，这就是盛世的开端啊。#今日贴纸打卡# #SUX爽吸#
1987年8月20日 "/>
1987年8月20日，街机街霸一代发售。
游戏中玩家只能选择RYU和KEN两名角色，如果进行对战的话，对战后无论是谁胜出都会直接结束游戏，这个设定实在是太恶了，估计当时CAPCOM的制作人员也并没有意识到对战的乐趣所在，也正因此游戏并没有引发对战的热潮。过于超前的理念和晦涩的操作方式导致本作无法得到广泛认可，不过其中蕴藏的巨大潜力却不容忽视。1988年底，HUDSON将本作作为PC-E CD-ROM2的首发游戏推出；1989年，CAPCOM使用CPS主板制作的经典过关游戏快打旋风也使用了街霸89的宣传名称，这就是盛世的开端啊。#今日贴纸打卡# #SUX爽吸#
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