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Teilenummer | AD484M1644VTA-8I |
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Beschreibung | Ascend Semiconductor Corporation(64Mb SDRAM) | |
Hersteller | ETC | |
Logo | ||
Gesamt 20 Seiten Ascend Semiconductor Corporation 64Mb SDRAM
AASSCCEENNDD
SSeemmiiccoonndduuccttoorr
6644MM SSDDRRAAMM
DDaattaa sshheeeett
Tel: (03)5635888 / Fax: (03)5635188/ http://www.ascendsemi.com.tw
Preliminary
1
Ascend Semiconductor Corporation 64Mb SDRAM
Block Diagram
A0
A1
A2
A3
A4
A5
A6
A7
A8
A9
A10
A11
BA0
BA1
Auto/Self
Refresh Counter
Mode Register Set
Memory
Array
S/A & I/O gating
Col. Decoder
Col. Add. Buffer
Col. Add. Counter
Burst Counter
DQM
Write DQM
Control
Data In
Data Out
Read DQM
Control
Timing Register
CLK
/CLK
CKE
/CS /RAS /CAS /WE DQM
DQi
Preliminary
6
6 Page Ascend Semiconductor Corporation 64Mb SDRAM
Current
state
Read with AP
/CS /R /C /W Addr.
HXXX
X
LHHH
X
LHH L
X
L H L H BA/CA/A10
L H L L BA/CA/A10
L L H H BA/RA
L L H L BA, A10
LL LH
X
L L L L Op-Code
Command
DESL
NOP
BST
READ/READA
WRIT/WRITA
ACT
PRE/PALL
REF/SELF
MRS
Action
Continue burst to end → Precharging
Continue burst to end → Precharging
ILLEGAL
ILLEGAL
ILLEGAL
ILLEGAL
ILLEGAL
ILLEGAL
ILLEGAL
HXXX
X
DESL
burst to end → Write
recovering with auto precharge
LHHH
X
NOP
Continue burst to end → Write
recovering with auto precharge
Write with AP
Precharging
Row activating
LHH L
X
L H L H BA/CA/A10
L H L L BA/CA/A10
L L H H BA/RA
L L H L BA, A10
LL LH
X
L L L L Op-Code
HXXX
X
LHHH
X
LHH L
X
L H L H BA/CA/A10
L H L L BA/CA/A10
L L H H BA/RA
L L H L BA, A10
LL LH
X
L L L L Op-Code
HXXX
X
LHHH
X
LHH L
X
L H L H BA/CA/A10
L H L L BA/CA/A10
L L H H BA/RA
L L H L BA, A10
LL LH
X
L L L L Op-Code
BST
READ/READA
WRIT/WRITA
ACT
PRE/PALL
REF/SELF
MRS
DESL
NOP
BST
READ/READA
WRIT/WRITA
ACT
PRE/PALL
REF/SELF
MRS
DESL
NOP
BST
READ/READA
WRIT/WRITA
ACT
PRE/PALL
REF/SELF
MRS
ILLEGAL
ILLEGAL
ILLEGAL
ILLEGAL
ILLEGAL
ILLEGAL
ILLEGAL
Nop → Enter idle after tRP
Nop → Enter idle after tRP
ILLEGAL
ILLEGAL
ILLEGAL
ILLEGAL
Nop → Enter idle after tRP
ILLEGAL
ILLEGAL
Nop → Enter idle after tRCD
Nop → Enter idle after tRCD
ILLEGAL
ILLEGAL
ILLEGAL
ILLEGAL
ILLEGAL
ILLEGAL
ILLEGAL
Remark H = High level, L = Low level, X = High or Low level (Don't care), AP = Auto Precharge
Notes
3
3
3
3
3
3
3
3
3
3
3
3
3
3,10
3
Preliminary
12
12 Page | ||
Seiten | Gesamt 20 Seiten | |
PDF Download | [ AD484M1644VTA-8I Schematic.PDF ] |
Teilenummer | Beschreibung | Hersteller |
AD484M1644VTA-8I | Ascend Semiconductor Corporation(64Mb SDRAM) | ETC |
AD484M1644VTA-8L | Ascend Semiconductor Corporation(64Mb SDRAM) | ETC |
AD484M1644VTA-8LI | Ascend Semiconductor Corporation(64Mb SDRAM) | ETC |
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