Semiconductor content addressable memory device
A memory and semiconductor technology, applied in static memory, digital memory information, information storage, etc., can solve problems such as use limitation, area reduction, power consumption difficulty, etc., and achieve the effect of low power consumption and large capacity
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no. 1 Embodiment approach
[0042] The associative memory device of this embodiment is such as figure 1 As shown, a plurality of unit search memory cells 100 are connected in series in the row direction to form a search word string 200 , and a plurality of search word strings 200 are arranged in a column direction to form a search block 201 .
[0043] Unit retrieval memory unit 100(MC) such as figure 2 As shown, digital data equivalent to "0" or "1" is held, and when one or both of the signal input from the first data input terminal 101 and the digital data held is "1", the data output terminal 103 outputs the same signal as the signal input from the second data input terminal 102 . That is, when the signal input from the second input terminal 102 is "1", "1" is output, and when it is "0", "0" is output. Also, when both the signal input from the first input terminal 101 and the held digital data are "0", "0" or indeterminate is output irrespective of the input signal from the second input terminal 102...
no. 2 Embodiment approach
[0061] In the first embodiment described above, the two regions of the D region and the Db region are connected in series, but in this embodiment, as Image 6 These are connected to the respective output terminals as shown, and the "AND" operation of the output of each output terminal is output as a word. Moreover, in and figure 1 The same symbols are assigned to the same parts, and their detailed descriptions are omitted.
[0062] In the present embodiment, the search character string is configured to include: a first character string (D region) 210 connected in series between a plurality of adjacent cells of the memory unit 100 by connecting the second input terminal and output terminal; and The second character string (Db area) 220 having the same structure as the first character string 210; "AND" (logical product) using the output terminal of the memory cell at the end of each of the first and second character strings 210, 220 as input Door 230. A search block is formed...
no. 3 Embodiment approach
[0066] Figure 7 It is a block diagram showing a schematic configuration of the associative memory device according to the third embodiment of the present invention. Moreover, in and figure 1 The same symbols are attached to the same parts, and their detailed descriptions are omitted. Also, although the representation of the retrieval block is simplified, the functionality and figure 1 Are the same.
[0067] The first retrieval block 501 except figure 1 In addition to the search block 201 of the search block 201, a sense amplifier 250 (250a-250c) for sensing each output of the search character string 200 is provided. The second search block 502 basically has the same structure as the first search block 501 . The output of the first search block 501 is provided as searched words I and Ib input to the D area and the Db area of the second search block 502 . Also, a circle attached to Ib of the search block 502 indicates that the data is input reversed.
[0068] In this e...
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