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CY7C1648KV18 데이터시트(PDF) 23 Page - Cypress Semiconductor |
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CY7C1648KV18 데이터시트(HTML) 23 Page - Cypress Semiconductor |
23 / 29 page Document Number: 001-44061 Rev. *L Page 23 of 29 CY7C1648KV18 CY7C1650KV18 Switching Waveforms Read/Write/Deselect Sequence Figure 6. Waveform for 2.0 Cycle Read Latency [37, 38, 39, 40] DON’T CARE UNDEFINED 1 2 34 5 6 7 8 9 10 READ READ READ NOP WRITE WRITE t NOP 11 K K LD R/W A tKH tKL tCYC tHC tSA tHA SC A0 A1 A2 A3 A4 CQ CQ QVLD QVLD t NOP t QVLD t tCCQO tCQOH t tCQOH QVLD t NOP DQ KHKH 12 (Read Latency = 2.0 Cycles) NOP NOP CCQO tSD HD tSD tHD t CLZ tCHZ D20 D21 D30 D31 t CQDOH Q00 Q11 Q01 Q10 tDOH tCO Q40 Q41 tCQD t t tCQH CQHCQH Notes 37. Q00 refers to output from address A0. Q01 refers to output from the next internal burst address following A0, that is, A0 + 1. 38. Outputs are disabled (High Z) one clock cycle after a NOP. 39. The third NOP cycle between read to write transition is not necessary for correct device operation when Read Latency = 2.0 cycles; however at high frequency operation, it is required to avoid bus contention. 40. In this example, if address A4 = A3, then data Q40 = D30 and Q41 = D31. Write data is forwarded immediately as read results. This note applies to the whole diagram. |
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