MB81EDS516545_10 Datasheet, PDF (13/60 Pages) Fujitsu Component Limited. – 512M Bit (4 bank x 2M word x 64 bit) Consumer Applications Specific Memory for SiP

MB81EDS516545
■ COMMAND TRUTH TABLE
1) Basic Command Truth Table
Command
DESELECT *¹
NO OPERATION *¹
BURST TERMINATE *^2, *³
READ *^3, *⁴
READ with Auto-precharge *^3, *⁴
WRITE *^3, *⁴
WRITE with Auto-precharge *^3, *⁴
BANK ACTIVE *^4, *⁵
MULTI BANK ACTIVE *^4, *^5, *⁶
PRECHARGE SINGLE BANK *^5, *⁷
PRECHARGE ALL BANKS *^5, *⁷
MULTI BANK PRECHARGE *^5, *^6, *⁷
AUTO REFRESH *⁷
BACKGROUND REFRESH ENTRY *⁶
BACKGROUND REFRESH EXIT *⁶
MODE REGISTER SET *⁸
Symbol
CS RAS CAS WE
BA
A10
(AP)
A[9:0],
A11, A12
SA
DESL H X X X X X
X
NOP L H H H X X
X
BST L H H L X X
X
READ L H L H V L
CA
L
READA L H L H V H
CA
WRIT L H L L V L
CA
WRITA L H L L V H
CA
ACT L L H H V
RA
MACT L L H H V
RA
H
PRE L L H L V L
X
L
PALL L L H L X H
X
MPRE L L H L V L
X
H
REF L L L H X X
X
L
BREF L L L H V L
V
H
BREFX L L L H X H
X
MRS L L L L V V
V
L
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
by ACT or MACT commands. Refer to the “■SIMPLIFIED STATE DIAGRAM”.
*5: ACT and MACT command can be issued after corresponding bank has been precharged by PRE or PALL or
MPRE command. Refer to the “■SIMPLIFIED STATE DIAGRAM”.
*6: SA must be High to issue optional commands of MACT, MPRE, BREF and BREFX.
*7: REF command can be issued after all banks have been precharged by PRE or PALL or MPRE command. Refer
to the “■SIMPLIFIED STATE DIAGRAM”.
*8: MRS command can be issued after all banks have been precharged and all DQ are in High-Z. Mode Register,
Extended Mode Register (1) and Extended Mode Register (2) is selected through BA input. Mode Register,
Extended Mode Register (1) and Extended Mode Register (2) must be set by MRS command after power up.
DS05-11463-2E
13