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S71GS256 Datasheet(PDF) 170 Page - SPANSION |
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S71GS256 Datasheet(HTML) 170 Page - SPANSION |
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170 / 195 page  170 CellularRAM Type 2 cellRAM_00_A0 October 4, 2004 Advan ce In form ati o n How Extended Timings Impact CellularRAM™ Operation Introduction This section describes CellularRAM™ timing requirements in systems that per- form extended operations. CellularRAM products use a DRAM technology that periodically requires refresh to ensure against data corruption. CellularRAM devices include on-chip circuitry that performs the required refresh in a manner that is completely transparent in sys- tems with normal bus timings. The refresh circuitry imposes constraints on timings in systems that take longer than 4µs to complete an operation. WRITE operations are affected if the device is configured for asynchronous operation. Both READ and WRITE operations are affected if the device is configured for page or burst-mode operation. tVP 10 10 ns tVPH 10 10 ns tVS 70 85 ns tWC 70 85 ns tWHZ 88 ns tWP 46 55 ns tWPH 10 10 ns tWR 00 ns Table 63. READ Timing Parameters—Asynchronous WRITE Followed by Asynchronous READ Symbol 70ns/80 MHz 85ns/66 MHz Units MinMax MinMax tAA 70 85 ns tBHZ 88 ns tBLZ 10 10 ns tCBPH 55 ns tCEM 44 µs tHZ 88 ns tLZ 10 10 ns tOE 20 20 ns tOHZ 88 ns tOLZ 55 ns Table 62. WRITE Timing Parameters—Asynchronous WRITE Followed by Asynchronous READ Symbol 70ns/80 MHz 85ns/66 MHz Units MinMax MinMax |
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