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Thus, when processing 80 column text data, there will be 80 intermediate CRC values saved for each scan line. Another approach to Phillips VXP501 pixel information to character format would be to store all 16 horizontal lines of digitized data 16 by Phillips VXP501 bytes and then process each character in serial order Two banks of 16 by 80 byte memory would be required so that new digitized data could be stored while previously stored data is being converted to CRC values.

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This approach uses software instead of hardware to do the processing, but otherwise is suitable for use in the present invention. The output of the Parity Generator is input to the Shift Register If this value is set to zero, then all 8 bits in will also be zero and the parity output will directly reflect the Video Input signal It is by this means that the Video Input is digitized, with the latched data being stored directly into the Video Bufferwithout being changed by the CRC generator. As shown in blockPhillips VXP501 first pixel of the second character directly follows the last pixel of the first character The 9th unused bit referred to earlier does not appear on the graph on FIG.


The Shift Register is cleared to zero via Phillips VXP501, 8 Pixel Clocks occur coinciding with the 8 pixels starting with After the 8th pixel is processed, the intermediate CRC value now appearing at the Latch input is latched via the Latch clock The shift register is again cleared via and the next character is processed starting with pixel While this next character is being processed, the value previously latchedis written to a temporary CRC buffer by pulsing the write line Then, the next horizontal scan line begins. After the 8th pixel is processed, the new intermediate CRC value is again latched and stored into the Temporary CRC Bufferas described above. This process continues until a horizontal scan line begins.


This is true for the remaining characters on this scan line The next scan line begins the next row of characters and the process starting at repeats until all 25 for an 80 by 25 video text mode rows of characters are converted and all character CRC values are stored into the Video output Bufferwhich is the same as the Video Output Buffer in Phillips VXP501. This could be accomplished by inserting a memory circuit before the video buffer, which would function as a look up table whereby the 16 bit CRC value referenced at will form the memory address. The resulting 16 bit output of this memory would contain the character relating to a given CRC.

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Phillips VXP501 invalid CRCs the 16 bit value is set to zeros. This approach would permit immediate translation of CRCs to characters and would improve Host Unit performance.

The Video time line shows three video pixels: VGA video requires a fast Pixel Clock The slanted lines indicated by shows jitter Phillips VXP501 when any two asynchronous signals interact the video signal and the Host Unit's video clock. Using 90 megahertz as the base clock rate for pixel clock generation in the current implementation this jitter is about 11 nanoseconds in duration. Thus, because of this jitter, to position the rising edge of the pixel clock near the end of the video pixel as shown at referencea resolution of 5 nanoseconds was incorporated into the design. Thus, if reference shows the pixel clock atthe circuitry can Phillips VXP501 the pixel clock ator 5 nanoseconds later, if needed.

This would make Phillips VXP501 base clock appear to be between to megahertz. Of course, since the base Phillips VXP501 in the current implementation is 90 megahertz, or a period of 11 nanoseconds, and the delay is 5 nanoseconds, the position of the pixel clock follows the pattern 0 ns, 5 nanoseconds, 11 ns, 16 ns, 22 ns, etc. That is, it is centered around a megahertz resolution, and it is a practical solution to achieve the desired result i.

Phillips VXP501 To explain jitter, the rising edge of the Horizontal Sync pulse synchronizes the pixel clock. Jitter is inherent in that it cannot be known in advance what the phase of the base clock will be at this time.

Computer interconnection system

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