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IS43TR16128A-125KBLI Datasheet(PDF) 10 Page - Integrated Silicon Solution, Inc |
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IS43TR16128A-125KBLI Datasheet(HTML) 10 Page - Integrated Silicon Solution, Inc |
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10 / 81 page  IS43/46TR16128A, IS43/46TR16128AL, IS43/46TR82560A, IS43/46TR82560AL Integrated Silicon Solution, Inc. – www.issi.com – 10 Rev. B1 8/08/2013 Figure2.3.1a tMRD Timing The MRS command to Non-MRS command delay, tMOD, is require for the DRAM to update the features except DLL reset, and is the minimum time required from an MRS command to a non-MRS command excluding NOP and DES shown as the following figure. Figure 2.3.1b tMOD Timing The mode register contents can be changed using the same command and timing requirements during normal operation as long as the DRAM is in idle state, i.e., all banks are in the precharged state with tRP satisfied, all data bursts are completed and CKE is high prior to writing into the mode register. If the RTT_NOM Feature is enabled in the Mode Register prior and/or after an MRS Command, the ODT Signal must continuously be registered LOW ensuring RTT is in an off State prior to the MRS command. The ODT Signal maybe registered high after tMOD has expired. If the RTT_NOM Feature is disabled in the Mode Register prior and after an MRS command, the ODT Signal can be registered either LOW or HIGH before, during and after the MRS command. The mode registers are divided into various fields depending on the functionality and/or modes. CK# CK Command Address CKE Settings ODT ODT RTT_Nom ENABLED prior and/or after MRS command RTT_Nom DISABLED prior and after MRS command ODTLoff + 1 Old Settings ( ( ) ) Time Break DON’T CARE Valid Valid Valid Valid Valid Valid Valid Valid Valid Valid Valid Valid MRS Valid Valid NOP/ DEC Valid Valid Valid Valid MRS Valid Valid Valid Valid Valid Valid Valid Valid Valid Valid Valid Valid NOP/ DEC NOP/ DEC NOP/ DEC tMRD tMRD New Settings CK# CK Command Address CKE Settings ODT ODT RTT_Nom ENABLED prior and/or after MRS command RTT_Nom DISABLED prior and after MRS command ODTLoff + 1 Old Settings ( ( ) ) Time Break DON’T CARE Valid Valid Valid Valid Valid Valid Valid Valid Valid Valid Valid Valid MRS Valid Valid NOP/ DEC Valid Valid Valid Valid Valid Valid Valid Valid Valid Valid Valid Valid Valid Valid Valid Valid NOP/ DEC NOP/ DEC NOP/ DEC tMOD New Settings NOP/ DEC |
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