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hello, i am trying to make a video grabber for the 21065 ez-kit lite connected through the emafe. since i already have the ez-kit, i thought of using the 21065l chip for the video grabber. i was thinking of developing it using the kit for ease. would anyone know whether the 21065l is fast enough to accept video input (something like reading at intervals of 30ns - 80 ns). i tried making a simple loop through the emafe, and the fastest i got was about 500+ns. (a simple do-until, output register value and modify register) maybe the latches add some more seconds to the output timing. could anyone suggest a way to verify whether i could reach the timing specs using the code? or a more accurate way of calculating the timing of the code? the adsp-21065 says 66MIPS, so i assumed 66M instructions per sec. would that be accurate enough. thanks.. carlo |
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ez-lite 21065l video grabber
Started by ●July 14, 2003
Reply by ●July 14, 20032003-07-14
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Carlo wrote: > hello, > i am trying to make a video grabber for the 21065 ez-kit lite > connected through the emafe. since i already have the ez-kit, i > thought of using the 21065l chip for the video grabber. i was > thinking of developing it using the kit for ease. would anyone know > whether the 21065l is fast enough to accept video input (something > like reading at intervals of 30ns - 80 ns). Hi Carlo, you have to specify data stream rate: how much data do you want to read at these intervals? For example: Video frame rate: 25 Hz Frame resolution: 256 x 256 = 64k pixels Pixel depth: 8 bits => Data rate: 25 x 64k x 8 = 13.1 Mbps (mega bits per second). The serial ports of the 65L at 66MHz accept a maximum rate of 33 Mbps, so this example application would work. At this rate you have about 40 instructions per pixel (66 MIPS / frame rate / frame resolution), not counting main loop overhead. If you have substantially higher data rate (due to higher resolution or coloured pixels) I would suggest either the 21161N-EZKIT, or even better, a TigerSHARC-EZKIT. Regards, Andor |
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Reply by ●July 15, 20032003-07-15
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Hi! Also the ADSP-BF533-EZLITE can be of interest. It already has the analog video in/out and converters, and the DSP chip runs at 600 MHz!!! JaaC andor_bariska <> wrote: Carlo wrote: > hello, > i am trying to make a video grabber for the 21065 ez-kit lite > connected through the emafe. since i already have the ez-kit, i > thought of using the 21065l chip for the video grabber. i was > thinking of developing it using the kit for ease. would anyone know > whether the 21065l is fast enough to accept video input (something > like reading at intervals of 30ns - 80 ns). Hi Carlo, you have to specify data stream rate: how much data do you want to read at these intervals? For example: Video frame rate: 25 Hz Frame resolution: 256 x 256 = 64k pixels Pixel depth: 8 bits => Data rate: 25 x 64k x 8 = 13.1 Mbps (mega bits per second). The serial ports of the 65L at 66MHz accept a maximum rate of 33 Mbps, so this example application would work. At this rate you have about 40 instructions per pixel (66 MIPS / frame rate / frame resolution), not counting main loop overhead. If you have substantially higher data rate (due to higher resolution or coloured pixels) I would suggest either the 21161N-EZKIT, or even better, a TigerSHARC-EZKIT. Regards, Andor _____________________________________ Note: If you do a simple "reply" with your email client, only the author of this message will receive your answer. You need to do a "reply all" if you want your answer to be distributed to the entire group. _____________________________________ About this discussion group: To Join: Send an email to To Post: Send an email to To Leave: Send an email to Archives: http://groups.yahoo.com/group/adsp Other Groups: http://www.dsprelated.com/groups.php3 ">http://docs.yahoo.com/info/terms/ --------------------------------- |
