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UPD4218165LG5-A60-7JF Datasheet(PDF) 6 Page - NEC |
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UPD4218165LG5-A60-7JF Datasheet(HTML) 6 Page - NEC |
6 / 48 page µPD42S18165L, 4218165L 6 Hyper Page Mode (EDO) The hyper page mode (EDO) is a kind of page mode with enhanced features. The two major features of the hyper page mode (EDO) are as follows. 1. Data output time is extended. In the hyper page mode (EDO), the output data is held to the next CAS cycle’s falling edge, instead of the rising edge. For this reason, valid data output time in the hyper page mode (EDO) is extended compared with the fast page mode (= data extend function). In the fast page mode, the data output time becomes shorter as the CAS cycle time becomes shorter. Therefore, in the hyper page mode (EDO), the timing margin in read cycle is larger than that of the fast page mode even if the CAS cycle time becomes shorter. 2. The CAS cycle time in the hyper page mode (EDO) is shorter than that in the fast page mode. In the hyper page mode (EDO), due to the data extend function, the CAS cycle time can be shorter than in the fast page mode if the timing margin is the same. Taking a device whose tRAC is 60 ns as an example, the CAS cycle time in the fast page mode is 25 ns while that in the fast page mode is 40 ns. In the hyper page mode (EDO), read (data out) and write (data in) cycles can be executed repeatedly during one RAS cycle. The hyper page mode (EDO) allows both read and write operations during one cycle. The following shows a part of the hyper page mode (EDO) read cycle. Specifications to be observed are described in the next page. Hyper Page Mode (EDO) Read Cycle tHPC tOEA tOEZ tAA Hi - Z Hi - Z Row Col.A Col.B Col.C tOEA tOLZ RAS VIH– VIL– CAS VIH– VIL– Address VIH– VIL– VIH– VIL– OE VIH– VIL– I/O VOH– VOL– Data out A Data out B Data out C Data out C tOEZ tAA tCAC tOEZ tOEP tOEP tOCH tCHO tCHO WE tRAC tAA tCAC tCLZ tCAC tCLZ tWPZ tDHC tOFC tOFR tWEZ tOCH tRRH tRCH |
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