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    • 68. 发明授权
    • Application specific exclusive of based logic module architecture for
FPGAs
    • 专用于FPGA的基于逻辑模块架构的应用
    • US5338983A
    • 1994-08-16
    • US166330
    • 1993-12-10
    • Manisha Agarwala
    • Manisha Agarwala
    • G06F7/00G06F7/50G06F7/501H03K19/173H03K19/177
    • G06F7/501H03K19/1736G06F2207/4812
    • A logic module (20) includes five input terminals (a-e), two output terminals (F1, F2), and control logic (22, 24, 26, 28, 30, 32, 36) for selectively coupling one or more of the input terminals to one of the output terminals. First and second input terminals (a, b) are connected to inputs of a first XOR gate (22); a third input terminal (c) is connected to one input of a multiplexor (24) through an inverter (26); a fourth input terminal (d) is connected to the other input of the multiplexor (24) and to one input of a first NAND gate (28); and a fifth input terminal (e) is connected to one input of a second XOR gate (30) and to one input of a second NAND gate (32). The first XOR gate (22) has its output connected to the other input of the first NAND gate (28) and to the control input of the multiplexor (24). The output of the multiplexor (24) is connected to the other inputs of the second XOR gate (30) and second NAND gate (32). The outputs of the first and second NAND gates (28, 32) are connected to the inputs of a third NAND gate (36). The outputs of the third NAND gate (36) and second XOR gate (30) are the output terminals (F2, F1) of the logic module (10). The configuration of the logic module (20) permits implementation of adders and subtractors for DSPs with only one logic module.
    • 逻辑模块(20)包括五个输入端(ae),两个输出端(F1,F2)和控制逻辑(22,24,26,28,30,32,36),用于选择性地耦合一个或多个输入 端子到其中一个输出端子。 第一和第二输入端子(a,b)连接到第一异或门(22)的输入端; 第三输入端(c)通过反相器(26)连接到多路复用器(24)的一个输入端; 第四输入端(d)连接到多路复用器(24)的另一输入端和第一NAND门(28)的一个输入端; 和第五输入端(e)连接到第二异或门(30)的一个输入端和第二与非门(32)的一个输入端。 第一异或门(22)的输出端连接到第一与非门(28)的另一个输入端和多路复用器(24)的控制输入端。 多路复用器(24)的输出端连接到第二异或门(30)和第二与非门(32)的其它输入端。 第一与非门(28,32)的输出端连接到第三与非门(36)的输入端。 第三与非门(36)和第二异或门(30)的输出是逻辑模块(10)的输出端子(F2,F1)。 逻辑模块(20)的配置允许仅使用一个逻辑模块来实现DSP的加法器和减法器。