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CMS4A16LAG Datasheet(PDF) 8 Page - FIDELIX |
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CMS4A16LAG Datasheet(HTML) 8 Page - FIDELIX |
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8 / 46 page  Rev. 0.5, May. ‘07 CMS4A16LAx–75Ex 8 sequential and the interleaved burst types, and a full-page burst is available for the sequential type. The full-page burst is used in conjunction with the BURST TERMINATE command to gene- rate arbitrary burst lengths. Reserved states should not be used, as unknown operation or incompatibility with future versions may result. When a READ or WRITE command is issued, a block of columns equal to the burst length is effectively selected. All accesses for that burst take place within this block, meaning that the burst will wrap within the block if a boundary is reached. The block is uniquely selected by A1-A8 when the burst length is set to two; by A2-A8 when the burst length is set to four; and by A3-A8 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. Burst Type The burst type can be set to either Sequential or Interleaved by using the M3 bit in the Mode register. The ordering of accesses within a burst is determined by the burst length, the burst type and the starting column address, as shown in Table 2. [4.5.6.7.8.9.10.] Table 1. Mode Register Definition. CAS Latency M6-A6 M5-A5 M4-A4 BT M3-A3 Burst Length M2-A2 M1-A1 WB M9-A9 Op Mode M8-A8 M7-A7 Reserved(Set to ‘0’) M0-A0 M10- A10 M11- A11 M12- BA0 M13- BA1 Reserved Reserved 1 0 1 Reserved Reserved 1 1 0 8 8 0 1 1 Reserved Reserved 1 0 0 2 2 0 0 1 4 4 0 1 0 Reserved Full Page 1 1 1 1 1 0 0 0 M3=1 M3=0 Burst Length M2 M1 M0 Reserved 1 1 1 Reserved 1 0 1 Reserved 1 1 0 3 0 1 1 Reserved 1 0 0 1 0 0 1 2 0 1 0 Reserved 0 0 0 CAS Latency M6 M5 M4 Interleaved 1 Sequential 0 Burst Type M3 Prog. Burst Length 0 Single Mode Access 1 Write Burst Mode M9 - Defined M6-M0 - 0 M7 All other states reserved - Standard Operation 0 Operating Mode M8 Note : 4. For full-page accesses: y = 512 5. For a burst length of two, A1-A8 select the block-of-two burst; A0 selects the starting column within the block. 6. For a burst length of four, A2-A8 select the block-of-four burst; A0-A1 select the starting column within the block. 7. For a burst length of eight, A3-A8 select the block-of-eight burst; A0-A2 select the starting column within the block. 8. For a full-page burst, the full row is selected and A0-A8 select the starting column. 9. Whenever a boundary of the block is reached within a given sequence above, the following access wraps within the block. 10. For a burst length of one, A0-A8 select the unique column to be accessed,and mode register bit M3 is ignored. |
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