MB81N643289 Datasheet, PDF (5/64 Pages) Fujitsu Component Limited. – 8 x 256K x 32 BIT DOUBLE DATA RATE FCRAMTM

MB81N643289-50/-60 Preliminary (AE1E)
s FUNCTION TRUTH TABLE
Note *1
COMMAND TRUTH TABLE
Note *2, and *3
Function
Notes Symbol PD CS RAS CAS WE AC BA2-0 A10 A9 A8-7 A6-0
Device Deselect
*4 DESL H H X X X X X X X X X
No Operation
*4 NOP H L H H H X X X X X X
Reserved
— H L H H L X X XXXX
Read
*5 RD H L H L H L V X X X V
Read with Auto-close
*5 RDA H L H L H H V X X X V
Write
*5 WR H L H L L L V X X X V
Write with Auto-close
*5 WRA H L H L L H V X X X V
Bank Active (RAS)
*6 ACTV H L L H H X V V V V V
Page Close Single Bank
*7 PC H L L H L L V X X X V
Page Close All Banks
*7 PCA H L L H L H X X X X V
Mode Register Set/
Extended Mode Register Set
*7,*8,*9
MRS/
EMRS
H
L
L
L LL
V LVVV
Notes: *1. V = Valid, L = Logic Low, H = Logic High, X = either L or H, Hi-Z = High Impedance.
*2. All commands are assumed to be valid state transitions.
*3. All inputs for command are latched on the rising edge of clock(CLK).
*4. NOP and DESL commands have the same effect on the part.
Unless specifically noted, NOP will represent both NOP and DESL command in later descriptions.
*5. RD, RDA, WR and WRA commands should only be issued after the corresponding bank has been
activated (ACTV command). Refer to STATE DIAGRAM in page 18.
*6. ACTV command should only be issued after corresponding bank has been page closed by PC or PCA
command.
*7. Either PC or PCA command and MRS or EMRS command are required after power up.
*8. MRS or EMRS command should only be issued after all banks have been page closed (PC or PCA
command), and DQs are in Hi-Z. Refer to STATE DIAGRAM.
*9. Refer to MODE REGISTER TABLE.
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