Chapter 9

Chapter 9 - 8086/8088 Hardware Specifications Power...

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Unformatted text preview: 8086/8088 Hardware Specifications ¡ Power supply: ¢ +5V with tolerance of ±10%; ¢ 360mA. ¡ Input characteristics: ¢ Logic 0 – 0.8V maximum, ±10μA maximum; ¢ Logic 1 – 2.0V minimum, ±10μA maximum. ¡ Output characteristics: ¢ Logic 0 – 0.45V maximum, 2mA maximum; ¢ Logic 1 – 2.4V minimum, -400μA maximum. Pinout ¡ Pins are divided into three separate buses: ¢ Address (output); ¢ Data (input/output); ¢ Control (input/output); Pinout ¡ Address/Data bus: ¢ AD7-AD0 (8088) or AD15-AD0 (8086). ¡ These lines are multiplexed address and data. ¡ Address bus: ¢ A15-A8 (8088). ¡ These are address lines only. ¡ Address/Control (status) bus: ¢ A19/S6 – A16/S3. ¡ These lines are multiplexed address and status. ¡ S6 is always logic 0, S5 indicates condition of the IF flag bits, S4 and S3 indicate which segment is being accessed during the current bus cycle. Pinout ¡ Control bus: ¢ RD’ ¡ When asserted it indicates a read operation is happening....
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This note was uploaded on 01/25/2012 for the course EE 3750 taught by Professor Desouza during the Fall '08 term at LSU.

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Chapter 9 - 8086/8088 Hardware Specifications Power...

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