Date: 0ct 17, 2013 Subject: Spex (sparc,ixthos) dsp timing and slow counts, and pixel rates 1. guidedog Table of slowcnt, pixel_reate, and Frame_rate.... slowcnt Clock_nsec clock_between pixel_rate Frame_rate samples usec msec fastmd 125 15 1.875 65.495 3 225 15 3.375 117.882 4 250 15 3.750 130.952 5 275 15 4.125 144.022 10 400 15 6.000 209.369 20 650 15 9.750 340.064 Notes: Slowcnt is a user parameter to slow down the clocking of the waveforms. The default for guidedog and bigdog are 20 (as of oct 17, 2013). Clock_nsec = 150 + slow_cnt*25 Clock_between_sample = there are 15 clocks between each 8 channel convert/sample. Pixel_rate_usec = clock_nsec x 15 Frame_rate_msec in the table is measured from guidedog. Frame_rate_msec (est) = pixel_rate * 512row * (512col/8ch) * 1.0644(add 6.44% overhead ) * 0.001(usec2msec) pixel_rate * 512 * 64 * 1.0644 * 0.001 2. bigdog Bigdog is similar except that there are 23 clocks between sample (vs 15 for guidedog). For Bigdog, I only measured 05, 10, and 20 slow counts. slowcnt Clock_nsec clock_between pixel_rate Frame_rate samples usec msec 5 275 23 6.325 216.955 10 400 23 9.200 315.454 20 650 23 14.950 512.452 Frame_rame is meaused from bigdog. me_rate_msec (est) = pixel_rate * 512row * (512col/8ch) * 1.0644(add 4.6% overhead ) * 0.001(usec2msec) pixel_rate * 512 * 64 * 1.046 * 0.001 References Saved some FITS files and DSPTiming files for Guidedog, Bigdog here in bigdog_data_timing/ and guidedog_data_timing/.