mt47h64m16hw-3 Micron Semiconductor Products, mt47h64m16hw-3 Datasheet - Page 4

• Manufacturer Part Number: mt47h64m16hw-3
• Description: 1gb X4, X8, X16 Ddr2 Sdram
• Manufacturer: Micron Semiconductor Products

State Diagram
Figure 2:
PDF: 09005aef8117c187/Source: 09005aef821aed36
DDR2_x4x8x16_Core1.fm - 1Gb DDR2: Rev. N; Core DDR2: Rev. C 4/08 EN
Simplified State Diagram
Setting
default
EMRS
MRS
OCD
Notes:
WRITE
precharge
WRITE AP
Writing
Writing
(E)MRS
with
auto
1. This diagram provides the basic command flow. It is not comprehensive and does not iden-
tify all timing requirements or possible command restrictions such as multibank interaction,
power down, entry/exit, etc.
power-
Active
down
Automatic Sequence
Command Sequence
PRE
Initialization
precharged
Precharging
sequence
Activating
PRE, PRE A
all banks
active
WRITE
Bank
READ
ACT
Idle
4
ACT = ACTIVATE
CKE H = CKE HIGH, exit power-down or self refresh
CKE L = CKE LOW, enter power-down
(E)MRS = (Extended) mode register set
PRE = PRECHARGE
PRE A = PRECHARGE ALL
READ = READ
READ AP = READ with auto precharge
REFRESH = REFRESH
SR = SELF REFRESH
WRITE = WRITE
WRITE AP = WRITE with auto precharge
Micron Technology, Inc., reserves the right to change products or specifications without notice.
Precharge
power-
down
precharge
Reading
READ AP
Reading
with
auto
REFRESH
1Gb: x4, x8, x16 DDR2 SDRAM
refreshing
CKE L
Self
READ
CKE L
Refreshing
©2003 Micron Technology, Inc. All rights reserved.
State Diagram