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GS8170LW72AGC-250I Datasheet(PDF) 9 Page - GSI Technology |
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GS8170LW72AGC-250I Datasheet(HTML) 9 Page - GSI Technology |
9 / 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 9/32 © 2003, GSI Technology SigmaRAM Late Write SRAM Burst Writes with Counter Wrap-around Burst Order The burst address counter wraps around to its initial state after four internal addresses (the loaded address and three more) have been accessed. SigmaRAMs always count in linear burst order. Note: The burst counter wraps to initial state on the 5th rising edge of clock. Echo Clock SRAMs feature Echo Clocks, CQ1, CQ2, CQ1, and CQ2 that track the performance of the output drivers. The Echo Clocks are delayed copies of the main RAM clock, CK. Echo Clocks are designed to track changes in output driver delays due to variance in die temperature and supply voltage. The Echo Clocks are designed to fire with the rest of the data output drivers. SigmaRAMs provide both in-phase, or true, Echo Clock outputs (CQ1 and CQ2) and inverted Echo Clock outputs (CQ1 and CQ2). Linear Burst Order A[1:0] 1st address 00 01 10 11 2nd address 01 10 11 00 3rd address 10 11 00 01 4th address 11 00 01 10 D1 D2 XX XX A2 Counter Wraps CQ Continue /E1 ADV DQ D2 ADV Continue CK Address A2 XXXXXX Continue Continue Write D0 /W A1 A2 A3 A0 D3 Internal Address |
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