HYB18L256160B Datasheet, PDF (46/58 Pages) Qimonda AG – DRAMs for Mobile Applications 256-Mbit Mobile-RAM

Data Sheet
HY[B/E]18L256160B[C/F]L-7.5
256-Mbit Mobile-RAM
TABLE 20
Current State Bank n - Command to Bank m (different bank)
Current State CS RAS CAS WE Command / Action
Note
Any
H X X X DESELECT (NOP / continue previous operation)
1)2)3)4)5)6)
L
H
H
H
NO OPERATION (NOP / continue previous operation)
1) to 6)
Idle
X X X X Any command otherwise allowed to bank n
1) to 6)
Row Activating, L
L
H
H
ACTIVE (select and activate row)
Active, or
L
H
L
H
READ (select column and start READ burst)
Precharging
L
H
L
L
WRITE (select column and start WRITE burst)
1) to 6)
1) to 7)
1) to 7)
L
L
H
L
PRECHARGE (deactivate row in bank or banks)
1) to 6)
Read (Auto-
L
L
H
H
ACTIVE (select and activate row)
Precharge
Disabled)
L
H
L
H
READ (select column and start READ burst)
L
H
L
L
WRITE (select column and start WRITE burst)
1) to 6)
1) to 7)
1) to 8)
L
L
H
L
PRECHARGE (deactivate row in bank or banks)
1) to 6)
Write (Auto-
L
L
H H ACTIVE (select and activate row)
Precharge
Disabled)
L
H
L
H
READ (select column and start READ burst)
L
H
L
L
WRITE (select column and start WRITE burst)
1) to 6)
1) to 7)
1) to 7)
Read
(with Auto-
Precharge)
L
L
H
L
PRECHARGE (deactivate row in bank or banks)
L
L
H
H
ACTIVE (select and activate row)
L
H
L
H
READ (select column and start READ burst)
L
H
L
L
WRITE (select column and start WRITE burst)
1) to 6)
1) to 6)
1) to 7), 9)
1) to 9)
L
L
H
L
PRECHARGE (deactivate row in bank or banks)
1) to 6)
Write
(with Auto-
Precharge)
L
L
H
H
ACTIVE (select and activate row)
L
H
L
H
READ (select column and start READ burst)
L
H
L
L
WRITE (select column and start WRITE burst)
L
L
H
L
PRECHARGE (deactivate row in bank or banks)
1) to 6)
1) to 7), 9)
1) to 7), 9)
1) to 6)
1) This table applies when CKEn-1 was HIGH and CKEn is HIGH and after t_RC has been met (if the previous state was Self Refresh).
2) This table describes alternate bank operation, except where noted, i.e., the current state is for bank n and the commands 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.
3) Current state definitions, see Table 21
4) AUTO REFRESH, SELF REFRESH and MODE REGISTER SET commands may only be issued when all banks are idle.
5) A BURST TERMINATE command cannot be issued to another bank; it applies to the bank represented by the current state only.
6) All states and sequences not shown are illegal or reserved.
7) READs or WRITEs listed in the Command/Action column include READs or WRITEs with Auto Precharge enabled and READs or WRITEs
with Auto Precharge disabled.
8) Requires appropriate DQM masking.
9) Concurrent Auto Precharge: bank n will start precharging when its burst has been interrupted by a READ or WRITE command to bank m.
Rev. 1.73, 2006-09
46
01302004-CZ2R-J9SE