System and method for transferring data using a frame-scanning display device

• US 5,742,260 A
• Filed: 05/22/1995
• Issued: 04/21/1998
• Est. Priority Date: 05/22/1995
• Status: Expired due to Term

• Current Assignee: Microsoft Technology Licensing LLC (Microsoft Corporation)
• Original Assignee: Microsoft Corporation
• Inventors: Miller, J. Mark, Dvorachek, Thomas J. III, Fishman, Neil S.
• Primary Examiner(s): Hjerpe, Richard
• Assistant Examiner(s): CHANG, KENT WU
• Application Number:
  US08/447,012
• Time in Patent Office: 1,065 Days
• Field of Search: 345/1.2, 345/14, 370/105.1, 370/105.4, 370/513, 370/509, 370/510
• US Class Current: 345/2.3
• CPC Class Codes: G04G 21/00 Input or output devices integrated in time-pieces
• CPC Class Codes: H04L 1/004 by using forward error control H04L1/0618 takes precedence; coding, decoding or code conversion, for error detection or correction H03M13/00

Abstract

The invention encompasses a system and method for serially transferring a sequence of data bits having binary values. This includes a step of displaying sequential display frames on a frame-scanning graphics display device, wherein each sequential display frame is associated with an individual group of data bits. Each group of data bits is associated with one or more data framing bits. The framing bits are inverted from one sequential display frame to the next. Within each display frame, sequentially-scanned data transmission lines are selectively illuminated to represent the individual groups of data bits associated with the display frames and their associated data framing bits. Bits having a first binary value are represented by illuminated display frame lines. Bits having a second binary value are represented by non-illuminated display frame lines. A receiving device can determine the validity of a particular display frame by determining whether the framing bits of the display frame are inverted from the framing bits of the previous display frame. Further aspects of the invention provide error detection and correction capabilities, and also provide methods of making the most efficient utilization of the data transfer mechanism.

Claims

1. A method of serially transmitting a sequence of data bits, the method comprising the following steps:

displaying sequential display frames on a frame-scanning graphics display device, the sequential display frames being associated with individual groups of data bits;

associating at least one data framing bit with each individual group of data bits;

selectively illuminating sequentially-scanned data transmission lines within the display frames to represent the individual groups of data bits associated with the display frames and the associated data framing bits, wherein bits having a first binary value are represented by the data transmission lines which are illuminated, and wherein bits having a second binary value are represented by the data transmission lines which are not illuminated;

changing the binary values of the framing bits associated with the individual groups of data bits from one sequential display frame to the next;

wherein the illuminating step comprises writing the sequentially-scanned data transmission lines of the sequential display frames to a frame buffer, the data transmission line representing one of the data framing bits associated with an individual group of data bits being written only after all of the other data transmission lines of a particular display frame have been written.

2. A method as recited in claim 1, wherein the changing step comprises inverting the binary values of the framing bits associated with the individual groups of data bits from one sequential display frame to the next.

3. A method as recited in claim 1, wherein the associating step comprises associating a pair of the data framing bits with each individual group of data bits, the data framing bits within each pair having a predetermined binary relationship to each other.

4. A method as recited in claim 1, wherein the associating step comprises associating a pair of the data framing bits with each individual group of data bits, the data framing bits within each pair having a predetermined binary relationship to each other, wherein the method further comprises positioning the data framing bits of each pair in leading and trailing positions with respect to the associated individual groups of data bits;

the data transmission line representing the leading framing bit within a particular display frame being written only after all of the other data transmission lines of the particular display frame have been written.

5. A method as recited in claim 1 wherein the associating step comprises associating a pair of the data framing bits with each individual group of data bits, the data framing bits within each pair having a predetermined binary relationship to each other, the method further comprising:

optically monitoring the illumination of the sequentially-scanned data transmission lines of the sequential display frames to receive the individual groups of data bits and the associated data framing bits;

discarding the data bits of a particular display frame if the bits of the data framing bit pair of the particular display frame do not have the predetermined binary relationship to each other.

6. A method as recited in claim 1 wherein the associating step comprises associating a pair of the data framing bits with each individual group of data bits, the data framing bits within each pair having a predetermined binary relationship to each other, the method further comprising:

optically monitoring the illumination of the sequentially-scanned data transmission lines of the sequential display frames to receive the individual groups of data bits and the associated data framing bits;

storing the data bits of a particular display frame if the bits of the data framing bit pair of the particular display frame have the predetermined binary relationship to each other;

discarding the data bits of a particular display frame if the bits of the data framing bit pair of the particular display frame do not have the predetermined binary relationship to each other.

7. A method as recited in claim 1, wherein the associating step comprises associating a pair of the data framing bits with each individual group of data bits, the data framing bits within each pair being equal to each other.

8. A method as recited in claim 1, the wherein associating step comprises associating a pair of the data framing bits with each individual group of data bits, the data framing bits within each pair being opposite to each other.

9. A method as recited in claim 1, wherein:

the associating step comprises associating only a single data framing bit with each group of data bits.

10. A method as recited in claim 1, wherein the associating step comprises associating only a single data framing bit with each group of data bits, the method further comprising positioning the single data framing bit of a particular group of data bits in a leading position with respect to that particular group of data bits.

11. A method as recited in claim 1, further comprising:

associating consecutive frame numbers with the sequential display frames, each of the frame numbers being represented by a plurality of frame number bits;

wherein the illuminating step includes selectively illuminating sequentially-scanned data transmission lines within each display frame to represent the frame number bits associated with that display frame.

12. A method as recited in claim 1, further comprising:

associating consecutive frame numbers with the sequential display frames, each frame number being represented by a plurality of frame number bits;

the illuminating step including selectively illuminating sequentially-scanned data transmission lines within each display frame to represent the frame number bits associated with that display frame;

optically monitoring the illumination of the sequentially-scanned data transmission lines of the sequential display frames to receive the individual groups of data bits, the associated data framing bits, and the consecutive frame numbers;

declaring a data reception error if the frame numbers are not consecutively received.

13. A method as recited in claim 1, further comprising:

optically monitoring the illumination of the sequentially-scanned data transmission lines of the sequential display frames to receive the individual groups of data bits and the associated data framing bits;

discarding data word bits from a particular display frame if the binary value of the at least one framing bit associated with the particular display frame'"'"'s group of data bits has not changed.

14. A method as recited in claim 1, further comprising:

optically monitoring the illumination of the sequentially-scanned data transmission lines of the sequential display frames to receive the individual groups of data bits and the associated data framing bits;

discarding data word bits from a particular display frame if the binary value of the at least one framing bit associated with the particular display frame'"'"'s group of data bits has not changed;

storing data word bits from a particular display frame if the binary value of the at least one framing bit associated with the particular display frame'"'"'s group of data bits has changed.

15. A method of serially transmitting a sequence of data words, each of said data words comprising data word bits, the method comprising:

composing groups of display frame words, each of said display frame words comprising display frame word bits;

displaying sequential display frames on a frame-scanning graphics display device, the sequential display frames being associated with respective groups of display frame words;

providing at least one data framing bit in each respective group of display frame words;

positioning bits of the data words in the display frame words of the display frame word groups;

while displaying each of the sequential display frames, selectively illuminating sequentially-scanned data transmission display frame lines of the frame-scanning graphics display device to represent the bits of that display frame'"'"'s associated display frame word group, wherein bits having a first binary value are represented by data transmission lines which are illuminated, and wherein bits having a second binary value are represented by data transmission lines which are not illuminated;

changing the binary values of the framing bits associated with the respective groups of display frame words from one sequential display frame to the next;

wherein the step of positioning data word bits further comprises interleaving the bits of the data words among a plurality of the display frame words to leave open bit positions for the data framing bits, individual data word bits being positioned at bit locations in the display frame words corresponding to the bit locations of said individual data word bits in the data words to allow the data words to be reconstructed from the display frame words with only minimal bit shifting.

16. A method as recited in claim 15 wherein the step of positioning data word bits comprises dividing the bits of a particular data word between at least two of the display frame words to leave open bit positions for the data framing bits.

17. A method as recited in claim 15, the step of positioning data word bits further comprising interleaving the bits of the data words among a plurality of the display frame words to leave open bit positions for the data framing bits.

18. A method as recited in claim 15, wherein the bit locations of said individual data word bits in the data words to allow the data words to be reconstructed from the display frame words without bit shifting.

19. A method as recited in claim 15, the method further comprising reconstructing the data words from the display frame words with only minimal bit shifting.

20. A method as recited in claim 15, further comprising positioning error indicating bits in the display frame words, said error indicating bits being derived from the data word bits positioned in the display frame word groups.

21. A method as recited in claim 15, further comprising:

deriving a single error indicating code from the data word bits of a plurality of the display frame word groups, said error indicating code comprising error indicating bits having binary values; and

distributing the error indicating bits in the display frame words of said plurality of display frame word groups.

22. A method as recited in claim 15, wherein the displaying step comprises writing the sequentially-scanned data transmission lines of the sequential display frames to a frame buffer, the data transmission line representing one of the data framing bits associated with a particular group of display frame words being written only after all of the other data transmission lines of a particular display frame have been written.