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ESMMC64 Datasheet(PDF) 7 Page - Eorex Corporation |
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ESMMC64 Datasheet(HTML) 7 Page - Eorex Corporation |
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7 / 8 page  64MB/128MB/256MB/512MB MultiMediaCardTM Eorex Corporation www.eorex.com 7/8 Timing Diagram of Data Input and Output The access time (tAT) is divided into two parts: TSAD: The synchronous access time. This time defines the time of the maximum number of cycles which are required to access a byte of the memory field. TAAD: The synchronous access time to read a byte out of the memory field. The synchronous part of the access time is sum of the command frame length and some additional internal cycles (NSAD = 16 cycles). At 20MHz one cycle is 50ns (1/fCLK), multiplied with NSAD the resulting frame time is TSAD = 0.8µs. The asynchronous access delay TAAD = 600µs maximum. The resulting memory access time tAT is the sum of both parts: tAT = TSAD + TAAD with TSAD = NSAD/ fCLK |
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