Pyramidal decoder

 

(57) Abstract:

The invention relates to computing. The purpose of the invention is the simplification of the device. The objective is achieved by the fact that the pyramidal desireto has two control input connected to the first and second control inputs of all nodes decode and each node decryption contains two element MAJORITARILY and the inverter, and the input sample is connected with the first inputs of the first and second elements MAJORITARILY, information input is connected to the inverter and the second input of the second element MAJORITARILY, the first and second control inputs connected to third inputs of the first and second elements MAJORITARILY respectively. 1 table, 2 Il.

The invention relates to computing and can be used to build lightactivated devices.

The purpose of the invention is to simplify the decoder.

In Fig. 1 shows a functional diagram of the node decryption with the bit of information input, and Fig. 2 is a functional diagram of the pyramid decoder with bit information input and the number of levels K = 3.

The node decryption (Fig. 1) contains information log X - 1 logs- 2 SEL is nventor 7, the first and second elements 8 and 9 MAJORITARILY.

Pyramidal decoder (Fig. 2) contains three levels of nodes 10 decode and 23outputs 11.

Pyramidal decoder has two modes - basic and test.

In native mode, the inputs U1U2- 3, 4 management is a combination of 0, 0. Each node decryption implements function

Fo= C; F1= CsX, and all the device performs the function of a complete decoder. For information input (bits X1-X3in native mode served decrypted word.

In the test mode for informational inputs X1the decoder serves only two combinations: all zeros or all ones. The inputs U1U2management pyramidal decoder is test consisting of four combinations and which is complete in the class of single stuck-at faults. The validation test and the proof of its completeness in the table. Four of the test set to detect stuck-at faults in all eleven control points (CP) node decoding. In this way, including logseach test set is activated and the sequence signal the th pyramidal decoder, the scheme for the case K = 3 is shown in Fig. 2, is a standard test (see table).

PYRAMIDAL DECODER with K levels decode (K - bit information input of the decoder), and the j-th bit data of the input of the decoder is connected to the information input nodes decode the j-th layer (j = ), each output node of the decoding of the j-th level is connected to the input of the sampling site, decode (j+1)-th level, the first and second control inputs of the decoder are connected respectively to the first and second control inputs of all nodes decoding, each node decryption contains two element MAJORITARILY, characterized in that, to simplify decoder, each node decryption contains an inverter, and the input sampling node decryption connected with the first inputs of the first and second elements majoritarily, the information input node decryption is connected to a second input of the second element majoritarily and the input of the inverter, the output of which is connected to a second input of the first element of MAJORITARILY, the first and second control inputs of the node decryption connected to third inputs of the first and second elements MAJORITARILY respectively, the first and second outputs of the node decode - output is

 

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