memory products - Al Kossow's Bitsavers

MK4511(N,K)-12115/20Interr~Reque8t1cancel __REQ/CANx {ADxol and REQ/CANy (ADyo)Assuming that the Enable and Ready flags are set,writing a1 into a REO/CAN bit drives an enabledinterrupt output pin on the opposite port low. Theinterrupt line will be driven low tWIL foliOWinactheend of the write that places a 1 in the REal ANbit. For example, when XXXXXXXXhls written intolocation OOOH setting REQ/~x, INT y will go activelow within tWIL' Writing a 0 into the REO/CANbit cancels the interrupt request, returning the INToutput to a high state tWIH after the end ofwrite.FIGURE 6. INTERRUPT REOUEST TIMINGIIEAliVDATAInterrupt Acknowledge/Rea~ACKIRDY x (AD X2) and ACKIRDY y (ADY2) :Once an interrupt has been received at a port, theinterrupt can be turned off by' writing a1(XXXXXX1XX~ into the ACKIRDY bit of the receiv­Ing port. Writing an acknowledge will cause the interruptoutput to go high tWIH ·after the end of thewrite. The interrupt request flag cannot be set whilethe acknowledge flag is active. Ali acknowledgemust always be followed with a ready (writing a 0over the 1) before requests from the other'port canbe recognized. Interrupt requests can be recognizedtRRR after a ready. ' .ACKNOWLEDGEDATAj~j -"""'\'-__....J/ENABLE AND/ORREQUEST DATA~AND/oRIlliAI!![ DATAINTERRUPT OUTPUT TIMINGAC ELECTRICAL CHARACTERISTICS(OOC:sT A :s70OC) (Vcc = 5.0 V ± 10 percent)MK4511-12 MK4511-15 MK4511-20SYM PARAMETERS MIN MAX MIN MAX MIN MAX UNITS NOTEStWIL End of Write toTliiT Low , 50 60 85 nstWIH End of Write to TIiiT High 50 60 85 nstRRR Ready to Request Recognized 10 10 15. hs6111434