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MB81EDS256445 Datasheet(PDF) 11 Page - Fujitsu Component Limited. |
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MB81EDS256445 Datasheet(HTML) 11 Page - Fujitsu Component Limited. |
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11 / 52 page  MB81EDS256445 DS05-11456-1E 11 ■ COMMAND TRUTH TABLE 1) Basic Command Truth Table Note: V = Valid, L = VIL, H = VIH, X can be either VIL or VIH, RA = Row Address, CA = Column Address All commands are assumed to be valid state transitions and latched on the rising edge of CK. CKE assume to be kept High. *1: NOP and DESL commands have the same functionality. Unless specifically noted, NOP will represent both NOP and DESL command in later description. *2: When the current state is IDLE and CKE=L, BST command will represent DPD command. Refer to the “ ■CKE COMMAND TRUTH TABLE”. *3: BST command can be applied to READ or WRIT. READA and WRITA must not be terminated by BST command. *4: READ, READA, WRIT and WRITA commands can be issued after the corresponding bank has been activated. Refer to the “ ■SIMPLIFIED STATE DIAGRAM”. *5: ACT command can be issued after corresponding bank has been precharged by PRE or PALL command. Refer to the “ ■ SIMPLIFIED STATE DIAGRAM”. *6: REF command can be issued after all banks have been precharged by PRE or PALL command. Refer to the “ ■SIMPLIFIED STATE DIAGRAM”. *7: MRS command can be issued after all banks have been precharged and all DQ are in High-Z. Mode Register and Extended Mode Register are selected through BA input. Mode Register and Extended Mode Register must be set by MRS command after power up. Command Symbol CS RAS CAS WE BA A10 (AP) A[9:0], A11 DESELECT *1 DESL H XXXXX X NO OPERATION *1 NOP L HHH X X X BURST TERMINATE *2, *3 BST L H H L X X X READ *3, *4 READ LHLH V L CA READ with Auto-precharge *3, *4 READA L H L H V H CA WRITE *3, *4 WRIT L H L L V L CA WRITE with Auto-precharge *3, *4 WRITA L H L L V H CA BANK ACTIVE *4, *5 ACT L L H H V RA PRECHARGE SINGLE BANK *5, *6 PRE L L H L V L X PRECHARGE ALL BANKS *5, *6 PALL L L H L X H X AUTO REFRESH *6 REF LLL H X X X MODE REGISTER SET *7 MRS LLLL V V V |
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