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GS8170LW36AC-250 Datasheet(PDF) 10 Page - GSI Technology |
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GS8170LW36AC-250 Datasheet(HTML) 10 Page - GSI Technology |
10 / 32 page GS8170LW36/72AC-350/333/300/250 Specifications cited are subject to change without notice. For latest documentation see http://www.gsitechnology.com. Rev: 1.04 4/2005 10/32 © 2003, GSI Technology It should be noted that deselection of the RAM via E2 and E3 also deselects the Echo Clock output drivers. The deselection of Echo Clock drivers is always pipelined to the same degree as output data. Deselection of the RAM via E1 does not deactivate the Echo Clocks. Programmable Enables ΣRAMs feature two user-programmable chip enable inputs, E2 and E3. The sense of the inputs, whether they function as active low or active high inputs, is determined by the state of the programming inputs, EP2 and EP3. For example, if EP2 is held at VDD, E2 functions as an active high enable. If EP2 is held to VSS, E2 functions as an active low chip enable input. Programmability of E2 and E3 allows four banks of depth expansion to be accomplished with no additional logic. By programming the enable inputs of four SRAMs in binary sequence (00, 01, 10, 11) and driving the enable inputs with two address inputs, four SRAMs can be made to look like one larger RAM to the system. Example Four Bank Depth Expansion Schematic— Σ1x1Lp A CK E1 E2 E3 W A0–An CK W DQ0–DQn Bank 0 Bank 1 Bank 2 Bank 3 Bank Enable Truth Table EP2 EP3 E2 E3 Bank 0 VSS VSS Active Low Active Low Bank 1 VSS VDD Active Low Active High Bank 2 VDD VSS Active High Active Low Bank 3 VDD VDD Active High Active High E1 An – 1 An A0–An – 2 An – 1 An A0–An – 2 An – 1 An A0–An – 2 An – 1 An A0–An – 2 DQ A CK E2 E3 W DQ A CK E2 E3 W DQ A CK E2 E3 W DQ E1 E1 E1 CQ CQ CQ CQ CQ EP2 EP3 0 0 EP2 EP3 1 0 EP2 EP3 0 1 EP2 EP3 1 1 |
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