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W948D6FB / W948D2FB
256Mb Mobile LPDDR
Accessing Mode Register: Starts with registration of a MODE REGISTER SET command and ends when tMRD has been
met. Once tMRD is met, the LPDDR SDRAM will be in an ?all banks idle? state.
Precharging All: Starts with the registration of a PRECHARGE ALL command and ends when tRP is met. Once tRP is met,
the bank will be in the idle state.
10.
11.
12.
13.
Not bank-specific; requires that all banks are idle and no bursts are in progress.
Not bank-specific. BURST TERMINATE affects the most recent READ burst, regardless of bank.
Requires appropriate DM masking.
A WRITE command may be applied after the completion of the READ burst; otherwise, a BURST TERMINATE must be
used to end the READ prior to asserting a WRITE command.
6.11.6 Truth Table - Current State BANKn, Command to BANKn
CURRENT
STATE
CS
RAS
CAS WE
COMMAND
ACTION
NOTES
Any
Idle
H
L
X
L
X
H
X
L
X
H
X
H
X
H
X
H
DESELECT
NOP
ANY
ACTIVE
NOP or Continue previous Operation
NOP or Continue previous Operation
Any command allowed to bank m
Select and activate row
Row Activating,
Active, or
Precharging
Read with Auto
Precharge
disabled
Write with Auto
Precharge
disabled
Read with Auto
Precharge
Write with Auto
Precharge
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
H
H
L
L
H
H
L
L
H
H
L
L
H
H
L
L
H
H
L
L
L
H
H
L
L
H
H
L
L
H
H
L
L
H
H
L
L
H
H
L
L
H
H
L
L
H
H
L
L
H
H
L
L
H
H
L
L
READ
WRITE
PRECHARGE
ACTIVE
READ
WRITE
PRECHARGE
ACTIVE
READ
WRITE
PRECHARGE
ACTIVE
READ
WRITE
PRECHARGE
ACTIVE
READ
WRITE
PRECHARGE
Select column & start read burst
Select column & start write burst
Precharge
Select and activate row
Select column & start new read burst
Select column & start write burst
Precharge
Select and activate row
Select column & start read burst
Select column & start new write burst
Precharge
Select and activate row
Select column & start new read burst
Select column & start write burst
Precharge
Select and activate row
Select column & start read burst
Select column & start new write burst
Precharge
8
8
8
8,10
8, 9
8
5, 8
5, 8, 10
5, 8
5, 8
Publication Release Date : Oct, 15, 2012
- 23 -
Revision : A01-004
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