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2Gb: x16, x32 Mobile LPDDR2 SDRAM S4
Truth Tables
Table 52: Current State Bank n to Command to Bank m Truth Table (Continued)
Notes 1–6 apply to all parameters and conditions
Current State
of Bank n
Row activating,
active, or pre-
Command to Bank m
ACTIVATE
READ
Operation
Select and activate row in bank m
Select column and start READ burst
Next State for Bank m
Active
Reading
Notes
8
9
charging
from bank m
WRITE
Select column and start WRITE burst to
Writing
9
bank m
PRECHARGE
MRR
Deactivate row(s) in bank or banks
READ value from mode register
Precharging
Idle MR reading or active
10
11, 12, 13
MR reading
BST
READ or WRITE burst terminates an on-
Active
7
going READ/WRITE from/to bank m
Reading
READ
Select column and start READ burst
Reading
9
(auto precharge
from bank m
disabled)
WRITE
Select column and start WRITE burst to
Writing
9, 14
bank m
ACTIVATE
Select and activate row in bank m
Active
PRECHARGE
Deactivate row(s) in bank or banks
Precharging
10
Writing
READ
Select column and start READ burst
Reading
9, 15
(auto precharge
from bank m
disabled)
WRITE
Select column and start WRITE burst to
Writing
9
bank m
ACTIVATE
Select and activate row in bank m
Active
PRECHARGE
Deactivate row(s) in bank or banks
Precharging
10
Reading with
READ
Select column and start READ burst
Reading
9, 16
auto precharge
from bank m
WRITE
Select column and start WRITE burst to
Writing
9, 14, 16
bank m
ACTIVATE
Select and activate row in bank m
Active
PRECHARGE
Deactivate row(s) in bank or banks
Precharging
10
Writing with
READ
Select column and start READ burst
Reading
9, 15, 16
auto precharge
from bank m
WRITE
Select column and start WRITE burst to
Writing
9, 16
bank m
ACTIVATE
Select and activate row in bank m
Active
PRECHARGE
Deactivate row(s) in bank or banks
Precharging
10
Power-on
Resetting
MRW RESET
MRR
Begin device auto initialization
Read value from mode register
Resetting
Resetting MR reading
17, 18
Notes:
1. This table applies when: the previous state was self refresh or power-down; after t XSR
or t XP has been met; and both CKE n -1 and CKE n are HIGH.
2. All states and sequences not shown are illegal or reserved.
PDF: 09005aef83f3f2eb
2gb_mobile_lpddr2_s4_g69a.pdf – Rev. N 3/12 EN
110
Micron Technology, Inc. reserves the right to change products or specifications without notice.
2010 Micron Technology, Inc. All rights reserved.
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