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    • 6. 发明授权
    • Semiconductor memory
    • 半导体存储器
    • US4692901A
    • 1987-09-08
    • US762632
    • 1985-08-05
    • Masaki KumanoyaKazuyasu FujishimaHideshi MiyatakeHideto HidakaKatsumi DosakaYasumasa Nishimura
    • Masaki KumanoyaKazuyasu FujishimaHideshi MiyatakeHideto HidakaKatsumi DosakaYasumasa Nishimura
    • G11C29/34G11C7/00
    • G11C29/34
    • A semiconductor memory comprises memory cells (15-18, 27-30), a data writing terminal (1), a data readout terminal (48), transistors (3-10, 35-42), address signal input terminals (23-26), subdecode signal input terminals (43-46), driving signal generating circuits (49-52), parallel readout circuits (79-82) and test mode switching signal input terminal (53, 88). In writing of function test data for the memory cells, the driving signal generating circuits turn all of the transistors (3-10) on in response to a test mode switching signal with no regard to address signals, thereby to simultaneously write data in the memory cells (15-18). Further, in readout of the function test data for the memory cells, the parallel readout circuits read the storage contents of the memory cells (27-30) storing the test data in response to a test mode switching signal with no regard to subdecode signals. Logic circuit means (90, 91, 94) may be provided to output logical value corresponding to the test data stored in the memory cells when all of the logical values of the test data are at the same level.
    • 半导体存储器包括存储单元(15-18,27-30),数据写入端(1),数据读出端(48),晶体管(3-10,35-42),地址信号输入端(23- 26),子代码信号输入端子(43-46),驱动信号发生电路(49-52),并行读出电路(79-82)和测试模式切换信号输入端子(53,88)。 在写入存储单元的功能测试数据时,驱动信号发生电路响应于测试模式切换信号而使所有晶体管(3-10)响应于地址信号,从而同时将数据写入存储器 细胞(15-18)。 此外,在读出存储单元的功能测试数据时,并行读出电路响应于不考虑子代码信号的测试模式切换信号读取存储测试数据的存储单元(27-30)的存储内容。 可以提供逻辑电路装置(90,91,94)以当测试数据的所有逻辑值处于相同电平时输出与存储在存储单元中的测试数据相对应的逻辑值。