Advanced communication apparatus and method for verified communication
View Patent ↗A communication circuit for verified communication comprising a transmitter having input terminals to receive a data word, an encoder configured to encode the data word to create an encoded word different from the data word, and output terminals configured to transmit the data word and the encoded word. A receiver is coupled to the transmitter and includes input terminals to receive the data word as a received word and the encoded word, a decoder configured to decode the encoded word to create a decoded word, and a comparator configured to compare the received word and the decoded word to create a select signal, and a selector responsive to the select signal and configured to select the received data word or the decoded word based at least in part on the select signal. Advantages of the invention include the ability to verify redundant received data without decreasing bandwidth or increasing latency.
1. An apparatus for providing verified communication, comprising:
a transmitter including: input terminals to receive a data word, an encoder configured to encode the data word to create an encoded word different from the data word, and output terminals configured to transmit the data word and the encoded word; and,
a receiver coupled to the transmitter and including: input terminals to receive the data word as a received word and the encoded word, a decoder configured to decode the encoded word to create a decoded word, and a comparator configured to compare the received word and the decoded word to create a select signal, and a selector responsive to the select signal and configured to select the received data word or the decoded word based at least in part on the select signal;
wherein the transmitter is configured to simultaneously transmit the data word and the encoded word; and
wherein the receiver is configured to simultaneously receive the data word and the encoded word;
a first signal detector coupled to a first communications channel including a set of received words;
a second signal detector coupled to a second communications channel including a set of the encoded words;
wherein, if the first communications channel is not available, the first signal detector notifies the comparator which instructs the selector to choose the set of encoded words from the second communications channel; and,
wherein, if the second communications channel is not available, the second signal detector notifies the comparator which instructs the selector to choose the set of received words from the first communications channel.
2. The apparatus of claim 1 , wherein:
the encoder is configured to create the encoded word having the same number of bits as the data word.
3. The apparatus of claim 1 , wherein:
the encoder is configured, for each bit of the data word, to Exclusively OR (XOR) the other bits of the data word to create the encoded word.
4. The apparatus of claim 3 , wherein:
the decoder is configured, for each bit of the encoded word, to Exclusively OR (XOR) the other bits of the encoded word to create the decoded word.
5. The apparatus of claim 4 , wherein:
the comparator is configured to compare the bits in the received word with those in the decoded word and to select the valid bits in each word to recreate the data word.
6. The apparatus of claim 1 , wherein:
the decoder is configured, for each bit of the encoded word, to Exclusively OR (XOR) the other bits of the encoded word to create the decoded word.
7. The apparatus of claim 1 , wherein:
the comparator is configured to compare the bits in the received word with those in the decoded word and to select the valid bits in each word to recreate the data word.
8. The apparatus of claim 1 , wherein:
the comparator is configured to compare the bits in the received word with those in the decoded word and to instruct the selector to choose the valid bits in each word to recreate the data word according to the following rules:
(a) when there is no difference between the received word and the decoded word, then both words are correct;
(b) when there is a single bit difference between the received word and the decoded word, then the decoded word is correct;
(c) when there is an n−1 bit difference (where n is the number of bits in the data word) between the received word and the decoded word, then the received word is correct; and,
(d) when neither (a) or (b) or (c) is true, discarding the word as invalid.
9. The apparatus of claim 1 , wherein the receiver is coupled to the transmitter using a primary channel.
10. The apparatus of claim 9 , wherein the primary channel is the primary communications channel for the data word.
11. The apparatus of claim 10 , wherein a secondary channel is coupled to the transmitter through the encoder, and further coupled to the receiver through the decoder.
12. The apparatus of claim 11 , wherein the secondary channel comprises a redundant communications channel for transmission of the encoded word.