15 July 2008 NeXT SXI data processing system
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Abstract
The Soft X-ray Imager (SXI) is the X-ray CCD detector system on board the NeXT mission that is to be launched around 2013. The system consists of a camera, an SXI-specific data processing unit (SXI-E) and a CPU unit commonly used throughout the NeXT satellite. All the analog signal handling is restricted within the camera unit, and all the I/O of the unit are digital. The camera unit and SXI-E are connected by multiple LVDS lines, and SXI-E and the CPU unit will be connected by a SpaceWire (SpW) network. The network can connect SXI-E to multiple CPU units (the formal SXI CPU and neighbors) and all the CPU units in the network have connections to multiple neighbors: with this configuration, the SXI system can work even in the case that one SpW connection or the formal SXI CPU is down. The main tasks of SXI-E are to generate the CCD driving pattern, the acquisition of the image data stream and HK data supplied by the camera and transfer them to the CPU unit with the Remote Memory Access Protocol (RMAP) over SpW. In addition to them, SXI-E also detects the pixels whose values are higher than the event threshold and both adjacent pixels in the same line, and send their coordinates to the CPU unit. The CPU unit can reduce its load significantly with this information because it gets rid of the necessity to scan whole the image to detect X-ray events.
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Masanobu Ozaki, Naohisa Anabuki, Daisuke Matsuura, Hiroshi Nakajima, Emi Miyata, Kiyoshi Hayashida, Hiroshi Tsunemi, Takeshi G. Tsuru, Hironori Matsumoto, Aya Bamba, Takahisa Fujinaga, Tadayasu Dotani, Takeshi Takashima, Tadayuki Takahashi, Hiroshi Tomida, Junko Hiraga, Hiroshi Murakami, Takayoshi Kohmura, Kazunori Masukawa, Masahiro Kato, Atsushi Nakajima, Yo Watanabe, "NeXT SXI data processing system", Proc. SPIE 7011, Space Telescopes and Instrumentation 2008: Ultraviolet to Gamma Ray, 70112L (15 July 2008); doi: 10.1117/12.788193; https://doi.org/10.1117/12.788193
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