hm5216165 Elpida Memory, Inc., hm5216165 Datasheet - Page 6

• Manufacturer Part Number: hm5216165
• Description: 16 M Lvttl Interface Sdram 512-kword ? 16-bit ? 2-bank
• Manufacturer: Elpida Memory, Inc.

HM5216165 Series
Command Operation
Command Truth Table
The synchronous DRAM recognizes the following commands specified by the CS, RAS, CAS, WE and
address pins.
Function
Ignore command
No operation
Burst stop in full page
Column address and read command
Read with auto-precharge
Column address and write command
Write with auto-precharge
Row address strobe and bank act.
Precharge select bank
Precharge all bank
Refresh
Mode register set
Note: H: V
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
(256)), 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 (256), 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 AY7) and the bank select address
(BS). After the read operation, the output buffer becomes High-Z.
Read with auto-precharge [READ A]: This command automatically performs a precharge operation after a
burst read with a burst length of 1, 2, 4, or 8. When the burst length is full-page (256), this command is
illegal.
6
IH
. L: V
IL
. : V
IH
or V
IL
. V: Valid address input
Data Sheet E0167H10
Symbol
DESL
NOP
BST
READ
READ A
WRIT
WRIT A
ACTV
PRE
PALL
REF/SELF H
MRS
CKE
n - 1 n
H
H
H
H
H
H
H
H
H
H
H
V
CS
H
L
L
L
L
L
L
L
L
L
L
L
RAS CAS WE
H
H
H
H
H
H
L
L
L
L
L
H
H
L
L
L
L
H
H
H
L
L
H
L
H
H
L
L
H
L
L
H
L
A11 A10
V
V
V
V
V
V
V
L
H
L
H
V
L
H
V
A0
to A9
V
V
V
V
V
V