memory products - Al Kossow's Bitsavers

M8571MASTER. READS AFTER SETTING WORD ADDRESS (WRITE WORD ADDRESS; READ DATA)acknowtedilefrom slaveacknowtedgefrom ,laveacknowledgefrom slaveacknowledgefrom meater~ ~ ~S SLAVE ADDRESS 0 A X WORD ADDRESS A S SLAVE ADDRESS DATA Aacknowledgefrom masterlise ~I : : :D~TA: : : I, I p IL..- last byte ~••• his moment mas.er } ~ n bytes --lItransmitter becomesmaster receiver andM8S71 slave receiverbecomes slave transmitterAI Wauto incrementword address4) EfW TIME SPECSAfter the beginning of an EfW operation at a certainlocation the M8571 is "busy" until the operationis finished. To show this busy state, the M8571refuses acknowledge of the next data bytes to removethe M8571 from the "busy" state a data bytemust be sent after the tEW is over. This "dummy"byte will not be acknowledged and written. The datato be written in the next address must be sent againand will be acknowledged and written by theM8571.The master device that wants to use the self incrementfeature must therefore keep sending the nextdata byte and monitoring the acknowledge bit untilit becomes active.The communication sequence on the bus becomes,therefore.O. STA1. 10100ss0 A2. xyyyyyyy A3. zzzzzzzz A4a. t t t t t t t t H (not acknowledged whent