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AS4C128M16D2 Datasheet(PDF) 8 Page - Alliance Semiconductor Corporation |
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AS4C128M16D2 Datasheet(HTML) 8 Page - Alliance Semiconductor Corporation |
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8 / 75 page  AS4C128M16D2 Confidential 7 Version 2.0 – Oct/2014 *1) To guarantee ODT off, VREF must be valid and a low level must be applied to the ODT pin. Initialization Sequence after Power Up Programming the Mode Register For application flexibility, burst length, burst type, CAS latency, DLL reset function, write recovery time (tWR) are user defined variables and must be programmed with a Mode Register Set (MRS) command. Additionally, DLL disable function, driver impedance, additive CAS latency, single-ended strobe and ODT (On Die Termination) are also user defined variables and must be programmed with an Extended Mode Register Set (EMRS) command. Contents of the Mode Register (MR) or Extended Mode Registers (EMR(#)) can be altered by re-executing the MRS and EMRS Commands. If the user chooses to modify only a subset of the MRS or EMRS variables, all variables must be redefined when the MRS or EMRS commands are issued. MRS, EMRS and Reset DLL do not affect array contents, which means initialization including those can be executed any time after power-up without affecting array contents. |
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