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UPD45128841 数据表(PDF) 19 Page - NEC

部件名 UPD45128841
功能描述  128M-bit Synchronous DRAM 4-bank, LVTTL
Download  92 Pages
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制造商  NEC [NEC]
网页  http://www.nec.com/
标志 NEC - NEC

UPD45128841 数据表(HTML) 19 Page - NEC

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Data Sheet M12650EJBV0DS00
19
µµµµPD45128441, 45128841, 45128163
4.5 Command Truth Table for CKE
Current State
CKE
/CS /RAS /CAS /WE
Address
Action
Notes
n – 1
n
Self refresh
H
××××
×
×
INVALID, CLK (n – 1) would exit self refresh
LH
H
××
×
×
Self refresh recovery
LH
LH
H
××
Self refresh recovery
LH
LH
L
××
ILLEGAL
LH
L
L
××
×
ILLEGAL
LL
×××
×
×
Maintain self refresh
Self refresh recovery
H
H
H
××
×
×
Idle after tRC
HH
L
H
H
××
Idle after tRC
HH
L
H
L
××
ILLEGAL
HH
L
L
××
×
ILLEGAL
HL
H
××
×
×
ILLEGAL
HL
L
H
H
××
ILLEGAL
HL
L
H
L
××
ILLEGAL
H
LLL
××
×
ILLEGAL
Power down
H
××××
×
INVALID, CLK (n – 1) would exit power down
LH
H
××
×
×
EXIT power down
→ Idle
LH
LH
H
H
×
EXIT power down
→ Idle
LL
×××
×
×
Maintain power down mode
All banks idle
H
H
H
××
×
Refer to operations in Operative Command Table
HH
L
H
××
Refer to operations in Operative Command Table
HH
L
L
H
×
Refer to operations in Operative Command Table
H
H
LLL
H
×
CBR (auto) Refresh
H
H
L
L
L
L
Op-Code
Refer to operations in Operative Command Table
HL
H
××
×
Refer to operations in Operative Command Table
HL
L
H
××
Refer to operations in Operative Command Table
H
LLL
H
×
Refer to operations in Operative Command Table
H
LLLL
H
×
Self refresh
1
H
LLLL
L
Op-Code
Refer to operations in Operative Command Table
L
××××
×
×
Power down
1
Row active
H
××××
×
×
Refer to operations in Operative Command Table
L
××××
×
×
Power down
1
Any state other than
H
H
×××
×
Refer to operations in Operative Command Table
listed above
H
L
×××
×
×
Begin clock suspend next cycle
2
LH
×××
×
×
Exit clock suspend next cycle
LL
×××
×
×
Maintain clock suspend
Notes 1. Self refresh can be entered only from the all banks idle state. Power down can be entered only from all
banks idle or row active state.
2. Must be legal command as defined in Operative Command Table.
Remark H = High level, L = Low level,
× = High or Low level (Don't care)


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