Pattern Summary

In order to readout the device, we must output a variety of waveforms to clock the fast & slow muxes, reset the arrays/row, and indicate when to samples pixel values. Much of the wave forms are highly repetitive. After studing the array information, we have combined a sets of waveform into functional unit called patterns.

These patterns are stored as text files. There are 2 formats: nsfcam, and Spex format. In the spex format a preserve mask is introduced into the file. See the format definition and examples below:
 

The naming convension for the pattern files are described below.

1. The file names start with p1,p2..p5. This prefix indicates the general function the pattern performs.

 p1   - frame start.
 p2*  - Address next row.
 p3*  - Address next column
 p4*  - Reset a row/pair
 p5*  - idle state.

p1.pat - Frame start (clears row mux).

p2at.pat - Address Next Row 'A' with Toggle.
p2an - Address Next Row 'A' No Toggle.
p2bn - Address Next Row 'B' No Toggle.
p2ct - Address Next Row 'C' with Toggle.
p2cn - Address Next Row 'C' No Toggle.
p2dn - Address Next Row 'D' No Toggle.

p3q - Address column - (time delay after row select).
p3s - Address column Skip
p3f - Address column First Convert.
p3m - Address column Middle Converts.
p3l - Address column Last Converts.

Guidedog 512x512: P3 clocks/samples Two column (8 pixel/column): 512 = 32 * 2*8
Bigdog 1024x1024: P3 clocks/sample Two column (pixels/column) + duel channes: 1024 = 32 * (2*8*2)

p4 - Reset the Row-Pair.

p5 - Dead Time (integrating) pattern.
 
 
 

3. Using patterns to clock the array.

   A simple ARC (array_reset_clocking, or non-destructive readout).

      // full array
      nrow = 512
      ncol = 512
      P1                         // frame start, or initialize Row Mux
      // row muxes, are named A,B,C,D. Two row-pairs.
      for( y=0; y < nrows; y+=4 )  // upto 128 loops:  512 row / 4 row_per_loop
      {
         P2at                  // Skip to next AB row-pair, addresss A
         clock_next_row(ncol, row_reset=False);
         P2bn                  // address B
         clock_next_row(ncol, row_reset=False);
         P2ct                  // skip to next CD row-pair, address C
         clock_next_row(ncol, row_reset=False);
         P2dn                  // address D
         clock_next_row(ncol, row_reset=False);
      }

      clock_next_row(ncol, row_reset);
      {
         if( ncol > 0 )
            P2q                // delay after 'row select'

         P3s * ncol_to_skip;    // clock but don't sample (subarrays).

         P3f * 1;                  // sample 1st

         P3m * ncol_to_sample-2;   // sample middle pixels

         P3l * 1;                  // last pixel

         if( row_reset )
            P4
      }

   A simple CDS (cooralated double sample, resetting by row pairs) 

      // full array
      nrow = 512
      ncol = 512
      P1                         // frame start, or initialize Row Mux
      // row muxes, are named A,B,C,D. Two row-pairs.
      for( y=0; y < nrows; y+=4 )  // upto 128 loops:  512 row / 4 row_per_loop
      {
         // AB pair's sample
         P2at                  // Skip to next AB row-pair, addresss A
         clock_next_row(ncol, row_reset=False);
         P2bn                  // address B
         clock_next_row(ncol, row_reset=TRUE);
         // AB pair's pedestal
         P2an                  // addresss A (no toggle)
         clock_next_row(ncol, row_reset=False);
         P2bn                  // address B
         clock_next_row(ncol, row_reset=False);

         // CD pair's sample 
         P2ct                  // skip to next CD row-pair, address C
         clock_next_row(ncol, row_reset=False);
         P2dn                  // address D
         clock_next_row(ncol, row_reset=False);

         // CD pair's sample 
         P2cn                  // address C (no toggle)
         clock_next_row(ncol, row_reset=False);
         P2dn                  // address D
         clock_next_row(ncol, row_reset=False);
      }