6-Exams_Major_2 - King Fahd University of Petroleum &...

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King Fahd University of Petroleum & Minerals Electrical Engineering Department EE-390; Exam-2(071); 6 th January, 2008 Prob.1 Prob.2 Prob.3 Total Name : Section : I.D. Answer all three questions, which carries equal marks. Exam TIME: 6:30 to 8:00 PM 1(a). Find the address of Port A and Port C of 0 th PPI. Show how you obtain your answers and write them in the specified box below. Assume don’t care address pins are at ‘logic 0’ state. Port A (Physical address) (in Hex) Port C (Physical address) (in Hex) **Remember to use 0’s for don’t cares address pins.
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1(b). As shown in the previous figure, the data pins (D 0 -D 7 ) of the scanner are connected with the PA 0 -PA 7 (port A) of the 0 th PPI and the strobe signal (STB) of the scanner is connected with the LSB of Port C, of the 0 th PPI. Assume that once a byte-data is scanned, the scanner generates a short strobe- pulse (‘1’ Î ‘0’ Î ’1’), during which the computer receives the scanned data- byte. ( Thus , during ‘logic 0’ state of STB signal, PA 0 -PA 7 of the 0 th PPI receives the scanned data-byte but during ‘logic 1’ state, PA 0 -PA 7 of the 0 th PPI do not receive any data from the scanner )
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6-Exams_Major_2 - King Fahd University of Petroleum &...

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