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CDP1806ACQ Datasheet(PDF) 8 Page - Intersil Corporation |
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CDP1806ACQ Datasheet(HTML) 8 Page - Intersil Corporation |
8 / 30 page 8 NOTES: † This Timing Diagram is used to show signal relationships only, and does not represent any specific machine cycle. † All measurements are referenced to 50% point of the wave forms. † Shaded areas indicate “don’t care” or undefined state. Multiple transitions may occur during this period. † For the run (RAM only) mode only. †† For the run (RAM/ROM) mode only. FIGURE 5. TIMING WAVEFORMS 00 01 10 11 20 21 30 31 40 41 50 51 60 61 70 0 71 00 01 1 2 3 4 5 6 7 0 tW CLOCK tPLH tPHL TPA tPLH, tPHL tPLH tPHL TPB tSU tPLH, tPHL HIGH ORDER ADDRESS BYTE LOW ORDER ADDRESS BYTE tH MEMORY ADDRESS tPLH tSU tPHL tPHL MRD (MEMORY READ CYCLE) MWR (MEMORY WRITE CYCLE) tPHL tPLH † ME (MEMORY ENABLE) tSU IS ALLOWABLE INTERNAL RAM ACCESS TIME tSU tH tPHL tPLH †† EMS (EXTERNAL MEMORY SELECT) tPLH, tPHL tH DATA FROM CPU TO BUS DATA FROM INTERNAL MEMORY TO BUS (ME = LOW) tPLH tPHL tPLH, tPLH STATE CODES tPLH, tPHL Q N0, N1, N2 (I/O EXECUTION CYCLE) tPLH tPHL DATA LATCHED IN CPU tSU DATA FROM BUS TO CPU tH DMA SAMPLED (S1, S2, S3) tSU DMA REQUEST INTERRUPT SAMPLED (S1, S2) tSU tH INTERRUPT REQUEST EF1 - EF4 tSU tH WAIT tSU tH tSU tH tWL CLEAR tH tPLH, tPHL FLAG LINES SAMPLED END OF S0 tH tPLH, tPHL CDP1805AC, CDP1806AC |
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