Xilinx pg013 LogiCORE IP RGB to YCrCb Color-Space Converter v5 ...

Core Interfaces and Register SpaceCCOEF (0x012C) RegisterThe CCOEF register holds the CC coefficient expressed as an 18.16 floating point number.Multiply the CC floating point value by 65537 and round to the nearest integer.DCOEF (0x0130) RegisterThe DCOEF register holds the CD coefficient expressed as an 18.16 floating point number.Multiply the CD floating point value by 65537 and round to the nearest integer.The Interrupt SubsystemSTATUS register bits can trigger interrupts so embedded application developers canquickly identify faulty interfaces or incorrectly parameterized cores in a video system.Irrespective of whether the AXI4-Lite control interface is present or not, the RGB2YCrCbcore detects AXI4-Stream framing errors, as well as the beginning and the end of frameprocessing.When the core is instantiated with an AXI4-Lite Control interface, the optional interruptrequest pin (IRQ) is present. Events associated with bits of the STATUS register cangenerate a (level triggered) interrupt, if the corresponding bits of the interrupt enableregister (IRQ_ENABLE) are set. Once set by the corresponding event, bits of the STATUSregister stay set until the user application clears them by writing '1' to the desired bitpositions. Using this mechanism the system processor can identify and clear the interruptsource.Without the AXI4-Lite interface the user can still benefit from the core signaling error andstatus events. By selecting the Enable INTC Port check-box on the GUI, the core generatesthe optional INTC_IF port. This vector of signals gives parallel access to the individualinterrupt sources, as seen in Table 2-10.Unlike STATUS and ERROR flags, INTC_IF signals are not held, rather stay asserted onlywhile the corresponding event persists.Table 2-10: INTC_IF Signal FunctionsINTC_IF signalFunction0 Frame processing start1 Frame processing complete2 Reserved3 Reserved4 Video over AXI4-Stream Error5 EOL Early6 EOL LateRGB to YCrCb Color-Space Converter www.xilinx.com 22PG013 April 24, 2012Product Specification