HYB18L256169BF QIMONDA [Qimonda AG], HYB18L256169BF Datasheet - Page 38

• Manufacturer Part Number: HYB18L256169BF
• Description: 256-Mbit Mobile-RAM
• Manufacturer: QIMONDA [Qimonda AG]

5) The following states must not be interrupted by any executable command; DESELECT or NOP commands must be applied
6) All states and sequences not shown are illegal or reserved.
7) Not bank-specific; requires that all banks are idle and no bursts are in progress.
8) Same as NOP command in that state.
9) READs or WRITEs listed in the Command/Action column include READs or WRITEs with Auto Precharge enabled and
10) May or may not be bank-specific; if multiple banks are to be precharged, each must be in a valid state for precharging.
11) Not bank-specific; BURST TERMINATE affects the most recent READ or WRITE burst, regardless of bank.
Table 15
Current State
Any
Idle
Row Activating,
Active, or
Precharging
Read (Auto-
Precharge
Disabled)
Write (Auto-
Precharge
Disabled)
Read
(with Auto-
Precharge)
Write
(with Auto-
Precharge)
1) This table applies when CKEn-1 was HIGH and CKEn is HIGH and after
2) This table describes alternate bank operation, except where noted, i.e., the current state is for bank n and the commands
Data Sheet
on each positive clock edge during these states.
Refreshing:
Accessing Mode
Register:
Precharging All: Starts with registration of a PRECHARGE ALL command and ends when
READs or WRITEs with Auto Precharge disabled.
Refresh).
shown are those allowed to be issued to bank m (assuming that bank m is in such a state that the given command is
allowable). Exceptions are covered in the notes below.
Current State Bank n - Command to Bank m (different bank)
CS
H
X
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
Starts with registration of an AUTO REFRESH command and ends when
SDRAM is in the “all banks idle” state.
Starts with registration of a MODE REGISTER SET command and ends when
t
banks are in the idle state.
MRD
is met, the SDRAM is in the “all banks idle” state.
RAS CAS WE Command / Action
X
H
X
H
H
H
H
H
H
H
H
H
H
L
L
L
L
L
L
L
L
L
L
H
H
H
H
H
H
H
H
H
H
H
X
X
L
L
L
L
L
L
L
L
L
L
H
H
H
H
H
H
H
H
H
H
H
X
X
L
L
L
L
L
L
L
L
L
L
DESELECT (NOP / continue previous operation)
NO OPERATION (NOP / continue previous operation)
Any command otherwise allowed to bank n
ACTIVE (select and activate row)
READ (select column and start READ burst)
WRITE (select column and start WRITE burst)
PRECHARGE (deactivate row in bank or banks)
ACTIVE (select and activate row)
READ (select column and start READ burst)
WRITE (select column and start WRITE burst)
PRECHARGE (deactivate row in bank or banks)
ACTIVE (select and activate row)
READ (select column and start READ burst)
WRITE (select column and start WRITE burst)
PRECHARGE (deactivate row in bank or banks)
ACTIVE (select and activate row)
READ (select column and start READ burst)
WRITE (select column and start WRITE burst)
PRECHARGE (deactivate row in bank or banks)
ACTIVE (select and activate row)
READ (select column and start READ burst)
WRITE (select column and start WRITE burst)
PRECHARGE (deactivate row in bank or banks)
38
t
RC
has been met (if the previous state was Self
HY[B/E]18L256169BF-7.5
256-Mbit Mobile-RAM
t
t
RC
RP
Functional Description
is met. Once
02032006-MP0M-7FQG
is met. Once
t
MRD
Rev. 1.02, 2006-12
has been met. Once
t
RC
t
Notes
1)2)3)4)5)6)
1) to 6)
1) to 6)
1) to 6)
1) to 7)
1) to 7)
1) to 6)
1) to 6)
1) to 7)
1) to 8)
1) to 6)
1) to 6)
1) to 7)
1) to 7)
1) to 6)
1) to 6)
1) to 7), 9)
1) to 9)
1) to 6)
1) to 6)
1) to 7), 9)
1) to 7), 9)
1) to 6)
RP
is met, the
is met, all