The SCI Tracer
نویسندگان
چکیده
We present a powerful diagnosis tool for the IEEE Std.1596 Scalable Coherent Interface (SCI): the SCI Tracer. The purpose of the SCI Tracer is to acquire data and analyze the activities on SCI links. The SCI Tracer consists of a hardware module and a software environment. The hardware is implemented in a multi-board module matching the Double Europe VME standard. It evaluates the flag bit in SCI packets and multiplexes SCI symbols in groups of four to reduce the high frequency of SCI packet transmission. The conditions which define acquisition and storage of SCI symbols and the usage of the Tracer registers are implemented as bitmaps in SRAM. With physically 256 Kbyte Tracer memory, much useful information can be saved, such as SCI packets, time stamps, etc. The UNIX based software environment consists of a hardware related programming language, called the Tracer Control Language (TCL) and a TCL compiler that translates a source program into Tracer SRAM bitmaps.
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