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HM5216805TT-12 Datasheet(PDF) 10 Page - Hitachi Semiconductor

Part # HM5216805TT-12
Description  16 M LVTTL Interface SDRAM 100 MHz/83 MHz 1-Mword8-bit2-bank/2-Mword4-bit2-bank
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Manufacturer  HITACHI [Hitachi Semiconductor]
Direct Link  http://www.renesas.com/eng
Logo HITACHI - Hitachi Semiconductor

HM5216805TT-12 Datasheet(HTML) 10 Page - Hitachi Semiconductor

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HM5216805 Series, HM5216405 Series
10
Command Operation
Command Truth Table
The synchronous DRAM recognizes the following commands specified by the CS, RAS, CAS, WE and
address pins.
CKE
Function
Symbol
n – 1
n
CS
RAS
CAS
WE
A11
A10
A0 to A9
Ignore command
DESL
H
×
H
××××××
No operation
NOP
H
×
L
HHH
×××
Burst stop in full page
BST
H
×
L
HHL
×××
Column address and read
command
READ
H
×
LH
LH
V
L
V
Read with auto-precharge
READ A
H
×
LH
LH
V
H
V
Column address and write
command
WRIT
H
×
LH
LLV
LV
Write with auto-precharge
WRIT A
H
×
LH
LLV
H
V
Row address strobe and
bank act.
ACTV
H
×
L
L
H
H
VVV
Precharge select bank
PRE
H
×
LLH
LV
L
×
Precharge all bank
PALL
H
×
LLH
L
×
H
×
Refresh
REF/SELF H
V
LLLH
×××
Mode register set
MRS
H
×
LLLLV
V
V
Note: H: V
IH.
L: V
IL. ×: VIH or VIL.
V: Valid address input
Ignore command [DESL]: When this command is set (CS is High), the synchronous DRAM ignore
command input at the clock. However, the internal status is held.
No operation [NOP]: This command is not an execution command. However, the internal operations
continue.
Burst stop in full-page [BST]: This command stops a full-page burst operation (burst length = full-page
(512; HM5216805 Series, 1024; HM5216405 Series)), and is illegal otherwise. Full page burst continues
until this command is input. When data input/output is completed for a full-page of data, it automatically
returns to the start address, and input/output is performed repeatedly.
Column address strobe and read command [READ]:
This command starts a read operation. In
addition, the start address of burst read is determined by the column address (AY0 to AY8; HM5216805
Series, AY0 to AY9; HM5216405 Series) and the bank select address (BS). After the read operation, the
output buffer becomes High-Z.


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