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EM68C08CWAG-18H Datasheet(PDF) 7 Page - Etron Technology, Inc. |
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EM68C08CWAG-18H Datasheet(HTML) 7 Page - Etron Technology, Inc. |
7 / 63 page EtronTech EM68C08CWAG Rev. 1.1 7 Apr. /2016 Operation Mode The following tables provide a quick reference of available DDR2 SDRAM commands, including CKE power-down modes and bank-to-bank commands. Table 4. Truth Table (Note (1), (2)) Command State CKEn-1 CKEn DM BA0-2 A10 A0-9, 11-13 CS# RAS# CAS# WE# BankActivate Idle(3) H H X V Row address L L H H Single Bank Precharge Any H H X V L X L L H L All Banks Precharge Any H H X X H X L L H L Write Active(3) H H X V L Column address (A0 – A9) L H L L Write with AutoPrecharge Active(3) H H X V H L H L L Read Active(3) H H X V L Column address (A0 – A9) L H L H Read and Autoprecharge Active(3) H H X V H L H L H (Extended) Mode Register Set Idle H H X V OP code L L L L No-Operation Any H X X X X X L H H H Device Deselect Any H X X X X X H X X X Refresh Idle H H X X X X L L L H SelfRefresh Entry Idle H L X X X X L L L H SelfRefresh Exit Idle L H X X X X H X X X L H H H Power Down Mode Entry Idle H L X X X X H X X X L H H H Power Down Mode Exit Any L H X X X X H X X X L H H H Data Input Mask Disable Active H X L X X X X X X X Data Input Mask Enable(4) Active H X H X X X X X X X NOTE 1: V=Valid data, X=Don't Care, L=Low level, H=High level NOTE 2: CKEn signal is input level when commands are provided. CKEn-1 signal is input level one clock cycle before the commands are provided. NOTE 3: These are states of bank designated by BA signal. NOTE 4: DM can be enabled respectively. |
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