From: Jozsef L. <len...@gm...> - 2007-04-11 07:30:25
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Hi Can anybody tell me what the "CCD camera signals" feature means in the Verdex features ? I can directly wire a CMOS camera chip to the Verdex board ? Regards, Jocc |
From: Pascal <pa...@pa...> - 2007-04-11 13:15:49
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Jozsef Lenart wrote: > Can anybody tell me what the "CCD camera signals" feature means in the > Verdex features ? That's the idea. Most sensors have pretty much the same signals (clock, synchronous parallel pixel data, H/V sync, I2C for control). Look up "Quick Capture" in the PXA270 documentation. > I can directly wire a CMOS camera chip to the Verdex > board ? Yes, if you can find a mating 120 pin connector and etch a circuit board with 0.4 mm pitch :-) Pascal |
From: Craig H. <cr...@gu...> - 2007-04-11 22:14:50
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On Apr 11, 2007, at 6:15 AM, Pascal wrote: >> I can directly wire a CMOS camera chip to the Verdex >> board ? > > Yes, if you can find a mating 120 pin connector and etch a circuit > board with 0.4 mm pitch :-) I just ran the concept of a "breakout-120-CCD" board past Gordon, and he seemed to think it would be a good idea. That is, it'd probably be something like a 120-pin version of one of our ethernet boards, with the CCD signals brought out to through-holes like on the breakout boards. Any thoughts? C |
From: Dave C. <gu...@mo...> - 2007-04-11 23:04:25
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I've been getting ready to build an imaging board around the verdex, and I'm wondering a few things about the CIF interface. Does anybody know: 1) Where is the best source of information about how to use the CIF interface, and what it is capable of? A while ago I had read some pretty good documentation on it somewhere on Intel's web site, but now the documentation seems to be gone because of the Marvell (sp? situation, and so I'm not sure where to begin looking. 2) I'm assuming that data coming in over the CIF interface, is somehow buffered inside the PXA270 in some type of small FIFO, and then written to memory in some efficient way under the management of a DMA controller. Is this the correct way of thinking about the data flows? Particularly why I'm wondering, is that I'm going to want to do some fast on-the-fly processing of acquired imagery, and I'm wondering how much contention there would be in practice, between a running thread doing image processing, and the simultaneous acquisition of another image via the CIF interface. Given that the bus speed for verdex memory seems to be 100 MHz I'm guessing that, if you have a pixel clock of (say) 25 MHz, that the image acquisition usage of the bus would be around 25% during acquisition. Therefore, it seems to me like other threads should be able to keep running pretty well even during the acquisition of an image; I would think you'd have the processor's internal cache(s) helping you out a lot too, to reduce the bus requirements of running threads. Anyway, I'm not sure how valid my ways of thinking about all this are, and it's hard for me to estimate how well such a system would work, without actually trying to build up a prototype to test it. Any thoughts, insights, suggestions, etc., would be most welcome... --dave >I just ran the concept of a "breakout-120-CCD" board past Gordon, and >he seemed to think it would be a good idea. That is, it'd probably >be something like a 120-pin version of one of our ethernet boards, >with the CCD signals brought out to through-holes like on the >breakout boards. Any thoughts? |
From: Joel W. <jo...@in...> - 2007-04-11 23:26:39
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> I just ran the concept of a "breakout-120-CCD" board past Gordon, and > he seemed to think it would be a good idea. That is, it'd probably > be something like a 120-pin version of one of our ethernet boards, > with the CCD signals brought out to through-holes like on the > breakout boards. Any thoughts? > A flex cable for connectivity to a "camera board" would be good. This could allow for odd mounting. These guys have a PXA270 compatible camera board. I like the concept but I think the interconnect should be a flex cable. http://www.e-consystems.com/camerasensor.asp It would be good the have a pad for an optional camera flex connector on as many as possible of the 120 pin boards. Ethernet included. Then sell a couple different camera boards. my 2 cents. Joel |
From: Pascal <pa...@pa...> - 2007-04-12 00:18:46
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Craig Hughes wrote: > I just ran the concept of a "breakout-120-CCD" board past Gordon, and > he seemed to think it would be a good idea. That is, it'd probably > be something like a 120-pin version of one of our ethernet boards, > with the CCD signals brought out to through-holes like on the > breakout boards. Any thoughts? I would definitely buy a few of those. And what about making the layout compatible with the C3088/C3188 sensor modules (2x16 pins, 0.1" header) ? http://www.electronics123.net/amazon/datasheet/c3188a.pdf http://www.electronics123.net/amazon/datasheet/c3188a_sch.pdf I haven't fully checked whether they are compatible with the Quick Capture interface, but this pinout seems to be popular. Pascal |