HYB18M512160BFX Datasheet, PDF (42/52 Pages) Qimonda AG – DRAMs for Mobile Applications 512-Mbit DDR Mobile-RAM

HYB18M512160BFX
512-Mbit DDR Mobile-RAM
Functional Description
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) 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.
9) May or may not be bank-specific; if multiple banks are to be precharged, each must be in a valid state for precharging.
10) A WRITE command may be applied after the completion of the Read burst; otherwise, a BURST TERMINATE command
must be used to end the Read burst prior to issuing a WRITE command.
11) Not bank-specific; BURST TERMINATE affects the most recent Read burst, regardless of bank.
12) Requires appropriate DM masking.
Table 19 Current State Bank n - Command to Bank m (different bank)
Current State CS RAS CAS WE Command / Action
Notes
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 m
1) to 6)
Row Activating, L L H H ACTIVE (select and activate row)
1) to 6)
Active, or
Precharging
L H L H READ (select column and start Read burst)
L H L L WRITE (select column and start Write burst)
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)
1) to 6)
Precharge
Disabled)
L H L H READ (truncate Read and start new Read burst)
L H L L WRITE (truncate Read and start Write burst)
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)
1) to 6)
Precharge
Disabled)
L H L H READ (truncate Write and start Read burst)
L H L L WRITE (truncate Write and start new Write burst)
1) to 7), 9)
1) to 7)
L L H L PRECHARGE (Deactivate row in bank or banks)
1) to 6)
Read
L L H H ACTIVE (select and activate row)
1) to 6)
(with Auto-
Precharge)
L H L H READ (truncate Read and start new Read burst)
L H L L WRITE (truncate Read and start Write burst)
1) to 7)
1) to 8)
L L H L PRECHARGE (deactivate row in bank or banks)
1) to 6)
Write
L L H H ACTIVE (select and activate row)
1) to 6)
(with Auto-
Precharge)
L H L H READ (truncate Write and start Read burst)
L H L L WRITE (truncate Write and start new Write burst)
1) to 7)
1) to 7)
L L H L PRECHARGE (Deactivate row in bank or banks)
1) to 6)
1) This table applies when CKEn-1 was HIGH and CKEn is HIGH (see Table 17) and after t_XP or t_XSR has been met (if the
previous state was power-down or 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.
Data Sheet
42
Rev. 1.10, 2006-11
04052006-4SYQ-ZRN3