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 Data acquisition method and protocol controller circuit

Details
Inventors: Taki, Nobuhiro;
Assignee: Fujitsu Limited (Kawasaki, JP)
Primary Examiner: Kizou; Hassan
Assistant Examiner: Omar; Omar A.
Attorney, Agent or Firm: Staas & Halsey

A protocol control circuit for transferring data conforms to the IEEE 1394 standard. The control circuit includes a decoder and RS-type flip-flops.

DETAILED DESCRIPTION Briefly, the present invention is directed to a data acquisition circuit for acquiring transfer data having first and second logical values using a strobe signal having first and second logical values.
The transfer data and the strobe signal being arranged such that coincidence and uncoincidence of the first and second logical values thereof are alternately repeated.
The data acquisition circuit includes a decoder and first and second elements.
The decoder determines a coincidence and an uncoincidence between the transfer data and the strobe signal.
When there is a coincidence, the decoder outputs a first or second discrimination signal.
The first discrimination signal indicates coincidence between the first logical values of the transfer data and strobe signals.
The second discrimination signal indicates coincidence between the second logical values of the transfer data and strobe signals.
When there is an uncoincidence, the decoder further outputting a third or fourth discrimination signal.
The third discrimination signal indicates uncoincidence between the first logical value of the transfer data and the second logical value of the strobe signal.
The fourth discrimination signal indicates uncoincidence between the second logical value of the transfer data and the first logical value of the strobe signal.
The first element is connected to the decoder and outputs a signal having the first logical value in response to the first discrimination signal and further outputs a signal having the second logical value in response to the second discrimination signal.
The second element is connected to the decoder and outputs a signal having the first logical value in response to the third discrimination signal and further outputs a signal having the second logical value in response to the fourth discrimination signal.
The present invention further provides a data acquisition circuit including the decoder, a plurality of first and second elements, first and second write pointers, and first and second read pointers



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