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GS8170DW36AC-350I 데이터시트(PDF) 9 Page - GSI Technology |
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GS8170DW36AC-350I 데이터시트(HTML) 9 Page - GSI Technology |
9 / 32 page GS8170DW36/72AC-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 Double 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). 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. 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 ADV Counter Wraps D1 D2 D0 /E1 /W CQ DQ D2 D3 Write Continue XX Internal Address A2 A3 A0 A1 A2 CK Address A2 XX Continue Continue Continue XX XX XX |
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