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--- ao:camera_link [2018/07/06 13:37]
127.0.0.1 external edit
+++ ao:camera_link [2018/07/07 08:37] (current)
jones
@@ Line 1: / Line 1: @@
- For details on the Camera Link specification and the underlying protocol, see:\\ [[/file/view/CameraLinkSPEC.pdf/378907154/CameraLinkSPEC.pdf|CameraLinkSPEC.pdf]]\\  and\\ [[/file/view/channellink_design_guide.pdf/378907302/channellink_design_guide.pdf|channellink_design_guide.pdf]].\\ \\  Camera Link is based on the National Semiconductor "Channel Link". To be a 100% compatible Camera Link device, both the camera transmitter and the interface card receiver must be National Semiconductor devices, specifically, DS90CR2xxx and DS90LV04x chipsets.\\ \\  Camera Link has 3 basic modes, "base", "medium", and "full". Base uses only one of the Camera Link connectors (most interface cards come equipped with two connectors to be able to run in anyone of these modes), while medium and full use two Camera Link connectors. Since the Andor Xion camera has the potential to only run in base mode, pretty much any card that we get will work.\\ \\  Latency:\\  None of the "simple to obtain" brochures and literature have information on latency, they all talk about modes and throughputs, and whether the interface can provide power through the link. That said, the information on the National Semiconductor Channel Link chip lists something that might be useful: "2.5 / 0 ns Set & Hold Times on TxINPUTs". I interpret this to mean that it takes 2.5 ns to set a word and 0 ns to hold that value. Since the computer DRAM clocking is on the order of 10-40 ns, I suspect most of the latency is going to be in the computer DMA, transfer which is probably why the interface card manufacturers don't list it.\\ \\  PCI vs PCIe:\\  Camera Link interface cards come in many different formats, but in only two basic bus interfaces, PCI and PCIe. Base and medium modes can work with a PCI bus, but full mode requires a PCIe. A few of the cards have PCI versions that fit in 3U compact PCI chassis (like the metrology fiber interface in the OPLE rack), 6U compact PCI, and PC104. The AO computer at the telescope has both PCI and PCIe interfaces, so any traditional bus interface PCI/PCIe will work for us. The following table lists typical data rates for the various interfaces.\\
+====== Camera Link ======
+ For details on the Camera Link specification and the underlying protocol, see:\\
+{{ao:CameraLinkSPEC.pdf|CameraLinkSPEC.pdf}}\\
+and\\
+{{ao:channellink_design_guide.pdf|channellink_design_guide.pdf}}.\\
+\\
+Camera Link is based on the National Semiconductor "Channel Link". To be a 100% compatible Camera Link device, both the camera transmitter and the interface card receiver must be National Semiconductor devices, specifically, DS90CR2xxx and DS90LV04x chipsets.\\
+\\
+Camera Link has 3 basic modes, "base", "medium", and "full". Base uses only one of the Camera Link connectors (most interface cards come equipped with two connectors to be able to run in anyone of these modes), while medium and full use two Camera Link connectors. Since the Andor Xion camera has the potential to only run in base mode, pretty much any card that we get will work.\\ \\  Latency:\\  None of the "simple to obtain" brochures and literature have information on latency, they all talk about modes and throughputs, and whether the interface can provide power through the link. That said, the information on the National Semiconductor Channel Link chip lists something that might be useful: "2.5 / 0 ns Set & Hold Times on TxINPUTs". I interpret this to mean that it takes 2.5 ns to set a word and 0 ns to hold that value. Since the computer DRAM clocking is on the order of 10-40 ns, I suspect most of the latency is going to be in the computer DMA, transfer which is probably why the interface card manufacturers don't list it.\\ \\  PCI vs PCIe:\\  Camera Link interface cards come in many different formats, but in only two basic bus interfaces, PCI and PCIe. Base and medium modes can work with a PCI bus, but full mode requires a PCIe. A few of the cards have PCI versions that fit in 3U compact PCI chassis (like the metrology fiber interface in the OPLE rack), 6U compact PCI, and PC104. The AO computer at the telescope has both PCI and PCIe interfaces, so any traditional bus interface PCI/PCIe will work for us. The following table lists typical data rates for the various interfaces.\\
 | \\ | Peak\\ | Continuous\\ | Max Pixel Rate\\ |

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