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HYE18L512160BF-7.5 Datasheet(PDF) 10 Page - Qimonda AG |
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HYE18L512160BF-7.5 Datasheet(HTML) 10 Page - Qimonda AG |
10 / 57 page Data Sheet. Rev. 1.22, 2006-12 10 01132005-06IU-IGVM HY[B/E]18L512160BF-7.5 512-Mbit Mobile-RAM 2.2.1.1 Burst Length READ and WRITE accesses to the Mobile-RAM are burst oriented, with the burst length being programmable. The burst length determines the maximum number of column locations that can be accessed for a given READ or WRITE command. Burst lengths of 1, 2, 4, 8 locations are available for both the sequential and interleaved burst types. A full-page burst mode is available for the sequential burst type. When a READ or WRITE command is issued, a block of columns equal to the burst length is selected. All accesses for that burst take place within this block, meaning that the burst wrap within the block if a boundary is reached. The block is uniquely selected by: • A1-A9 when the burst length is set to two • A2-A9 when the burst length is set to four • A3-A9 when the burst length is set to eight. The remaining (least significant) address bit(s) is (are) used to select the starting location within the block. Full page bursts wrap within the page if the boundary is reached. Please note that full page bursts do not self-terminate; this implies that full-page read or write bursts with Auto Precharge are not legal commands. TABLE 6 Burst Definition BT 3w Burst Type 0 Sequential 1 Interleaved BL [2:0] w Burst Length 000 1 001 2 010 4 011 8 111 full page (Sequential burst type only) Note: All other bit combinations are RESERVED. Burst Length Starting Column Address Order of Accesses Within a Burst A2 A1 A0 Sequential Interleaved 2 0 0 - 1 0 - 1 1 1 - 0 1 - 0 4 0 0 0 - 1 - 2 - 3 0 - 1 - 2 - 3 0 1 1 - 2 - 3 - 0 1 - 0 - 3 - 2 1 0 2 - 3 - 0 - 1 2 - 3 - 0 - 1 1 1 3 - 0 - 1 - 2 3 - 2 - 1 - 0 Field Bits Type Description |
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