HYB18L256169BF QIMONDA [Qimonda AG], HYB18L256169BF Datasheet - Page 37

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

2.5
Table 14
Current State
Any
Idle
Row Active
Read
(Auto-
Precharge
Disabled)
Write
(Auto-
Precharge
Disabled)
1) This table applies when CKEn-1 was HIGH and CKEn is HIGH and after
2) This table is bank-specific, except where noted, i.e., the current state is for a specific bank and the commands shown are
3) Current state definitions:
4) The following states must not be interrupted by a command issued to the same bank. DESELECT or NOP commands, or
Data Sheet
refresh).
those allowed to be issued to that bank when in that state. Exceptions are covered in the notes below.
Idle:
Row Active:
Read:
Write:
allowable commands to the other bank should be issued on any clock edge occurring during these states. Allowable
commands to the other bank are determined by its current state and according to
Precharging:
Row Activating: Starts with registration of an ACTIVE command and ends when
Read with AP
Enabled:
Write with AP
Enabled:
Function Truth Tables
Current State Bank n - Command to Bank n
CS
H
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
The bank has been precharged, and
A row in the bank has been activated, and
accesses are in progress.
terminated.
A WRITE burst has been initiated, with Auto Precharge disabled, and has not yet terminated or been
terminated.
Starts with registration of a PRECHARGE command and ends when
is in the “idle” state.
is in the “row active” state.
Starts with registration of a READ command with Auto Precharge enabled and ends when
met. Once
Starts with registration of a WRITE command with Auto Precharge enabled and ends when
met. Once
A READ burst has been initiated, with Auto Precharge disabled, and has not yet terminated or been
RAS CAS WE Command / Action
X
H
H
H
H
H
H
H
H
H
L
L
L
L
L
L
L
t
t
RP
RP
H
H
H
H
H
H
H
H
X
L
L
L
L
L
L
L
L
is met, the bank is in the idle state.
is met, the bank is in the idle state.
H
H
H
H
H
H
X
L
L
L
L
L
L
L
L
L
L
DESELECT (NOP / continue previous operation)
NO OPERATION (NOP / continue previous operation)
ACTIVE (select and activate row)
AUTO REFRESH
MODE REGISTER SET
PRECHARGE
READ (select column and start READ burst)
WRITE (select column and start WRITE burst)
PRECHARGE (deactivate row in bank or banks)
READ (select column and start new READ burst)
WRITE (select column and start new WRITE burst)
PRECHARGE (truncate READ burst, start precharge)
BURST TERMINATE
READ (select column and start READ burst)
WRITE (select column and start WRITE burst)
PRECHARGE (truncate WRITE burst, start precharge)
BURST TERMINATE
t
RP
37
has been met.
t
RCD
has been met. No data bursts/accesses and no register
t
RC
has been met (if the previous state was self
t
Table
RCD
HY[B/E]18L256169BF-7.5
t
RP
is met. Once
15.
is met. Once
256-Mbit Mobile-RAM
Functional Description
02032006-MP0M-7FQG
t
Rev. 1.02, 2006-12
RCD
t
RP
is met, the bank
is met, the bank
Notes
1)2)3)4)5)6)
1) to 6)
1) to 6)
1) to 7)
1) to 7)
1) to 6), 8)
1) to 6), 9)
1) to 6), 9)
1) to 6), 10)
1) to 6), 9)
1) to 6), 9)
1) to 6), 10)
1) to 6), 11)
1) to 6), 9)
1) to 6), 9)
1) to 6), 10)
1) to 6), 11)
t
t
RP
RP
has been
has been