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IS82C89 Datasheet(PDF) 9 Page - Intersil Corporation |
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IS82C89 Datasheet(HTML) 9 Page - Intersil Corporation |
9 / 15 page 4-351 TABLE 1. SUMMARY OF 82C89 MODES, REQUESTING AND RELINQUISHING THE MULTI-MASTER SYSTEM BUS SINGLE LINES FROM 80C86 OR 80C88 OR 8088 IOB MODE ONLY IOB = LOW RESB = LOW RESB MODE ONLY IOB = HIGH, RESB = HIGH IOB MODE RESB MODE IOB = LOW, RESB = HIGH SINGLE BUS MODE IOB = HIGH RESB = LOW S2 S1 S0 SYSB/RESB = HIGH SYSB/RESB = LOW SYSB/RESB = HIGH SYSB/RESB = LOW I/O Commands 0 0 0 0 0 1 0 1 0 X X X † † † X X X X X X X X X † † † Halt 0 1 1 X XXXX X Memory Commands 1 1 1 0 0 1 0 1 0† † † † † † † X X X † † † X X X † † † Idle 1 1 1 X XXXX X NOTES: 1. X = Multi-Master System Bus is allowed to be Surrendered. 2. † = Multi-Master System Bus is Requested. MODE PIN STRAPPING MULTI-MASTER SYSTEM BUS REQUESTED** SURRENDERED* Single Bus Multi-Master Mode IOB = High RESB = Low Whenever the processor’s status lines go active HLT + TI • CBRQ + HPBRQ ‡ RESB Mode Only IOB = High RESB = High SYSB/RESB + High • ACTIVE STATUS (SYSB/RESB = Low + TI) • CBRQ + HLT + HPBRQ IOB Mode Only IOB = Low RESB = Low Memory Commands (I/O Status + TI) • CBRQ + HLT + HPBRQ IOB Mode RESB Mode IOB = Low RESB = High (Memory Command) • (SYSB/RESB = High) (I/O Status Commands) + SYSB/RESB = Low) • CBRQ + HPBRQ + HLT NOTES: * LOCK prevents surrender of Bus to any other arbiter, CRQLCK prevents surrender of Bus to any lower priority arbiter. ** Except for HALT and Passive or IDLE Status. ‡ HPBRQ, Higher priority Bus request or BPRN = 1. 1. IOB Active Low. 2. RESB Active High. 3. + is read as “OR” and • as “AND” 4. TI = Processor Idle Status S2, S1, S0 = 111 5. HLT = Processor Halt Status S2, S1, S0 = 011 82C89 |
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