Propeller DEMO: 20MHz BITstream Reader

Beau Schwabe · 2007-11-18 23:08

Originally I put this together thinking that it would work well for the Spectrum Analyzer, but it turns out that 12.5nS control with the waitcnt is a much better approach for the Spectrum Analyzer·application.

Anyway, this DEMO uses 4-COGs to read an Input pin at a·rate of 20MHz (50nS) and store 128,000 Bits of data in 6.4mS
·
Note: The VGA resolution in this DEMO was reduced to 512x192 to allocate more memory to the data Buffer.
········ The Data is stored in two Buffer locations..· Buffer1 and Buffer2 and is·interdigitated to one another as·indicated below...·

''  Buffer1 - X X X X _ X X X X _ X X X X _ X X X X _ X X X X _ X X X X _ X X X X _ X X X X
''  Buffer2 -  X X X X _ X X X X _ X X X X _ X X X X _ X X X X _ X X X X _ X X X X _ X X X X
''              
''            &#61600;                                                                            &#61600;
''           BIT0                                                                        BIT63

Enjoy!
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Beau Schwabe

IC Layout Engineer
Parallax, Inc.

Post Edited (Beau Schwabe (Parallax)) : 11/18/2007 11:55:05 PM GMT