HYB18M512160BFX Datasheet, PDF (41/52 Pages) Qimonda AG – DRAMs for Mobile Applications 512-Mbit DDR Mobile-RAM

HYB18M512160BFX
512-Mbit DDR Mobile-RAM
Functional Description
Table 18 Current State Bank n - Command to Bank n
Current State
Any
Idle
Row Active
Read
(Auto-
Precharge
Disabled)
Write
(Auto-
Precharge
CS RAS CAS WE Command / Action
H X X X DESELECT (NOP / continue previous operation)
L H H H NO OPERATION (NOP / continue previous operation)
L L H H ACTIVE (select and activate row)
L L L H AUTO REFRESH
L L L L MODE REGISTER SET
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)
L H L H READ (truncate Read and start new Read burst)
L H L L WRITE (truncate Read and start new Write burst)
L L H L PRECHARGE (truncate Read and start Precharge)
L H H L BURST TERMINATE
L H L H READ (truncate Write and start Read burst)
L H L L WRITE (truncate Write and start Write burst)
L L H L PRECHARGE (truncate Write burst, start Precharge)
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), 8)
1) to 6), 9)
1) to 6), 8)
1) to 6), 8), 10)
1) to 6), 9)
1) to 6), 11)
1) to 6), 8), 12)
1) to 6), 8)
1) to 6), 9),12)
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 is bank-specific, except where noted, i.e., the current state is for a specific bank and the commands shown are
those allowed to be issued to that bank when in that state. Exceptions are covered in the notes below.
3) Current state definitions:
Idle:
Row Active:
The bank has been precharged, and t_RP has been met.
A row in the bank has been activated, and t_RCD has been met. No data bursts / accesses and no register
accesses are in progress.
Read:
A READ burst has been initiated, with Auto Precharge disabled, and has not yet terminated or been
terminated.
Write:
A WRITE burst has been initiated, with Auto Precharge disabled, and has not yet terminated or been
terminated.
4) The following states must not be interrupted by a command issued to the same bank. DESELECT or NOP commands, or
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 Table 19.
Precharging:
Starts with registration of a PRECHARGE command and ends when t_RP is met. Once t_RP is met, the bank
is in the “idle” state.
Row Activating: Starts with registration of an ACTIVE command and ends when t_RCD is met. Once t_RCD is met, the bank
is in the “row active” state.
Read with AP
Enabled:
Write with AP
Starts with registration of a READ command with Auto Precharge enabled and ends when t_RP has been
met. Once t_RP is met, the bank is in the idle state.
Enabled:
Starts with registration of a WRITE command with Auto Precharge enabled and ends when t_RP has been
met. Once t_RP is met, the bank is in the idle state.
5) The following states must not be interrupted by any executable command; DESELECT or NOP commands must be applied
on each positive clock edge during these states.
Refreshing:
Starts with registration of an AUTO REFRESH command and ends when t_RC is met. Once t_RC is met, the
DDR Mobile-RAM is in the “all banks idle” state.
Accessing Mode
Register:
Starts with registration of a MODE REGISTER SET command and ends when t_MRD has been met. Once
t_MRD is met, the DDR Mobile-RAM is in the “all banks idle” state.
Precharging All: Starts with registration of a PRECHARGE ALL command and ends when t_RP is met. Once t_RP is met, all
banks are in the idle state.
Data Sheet
41
Rev. 1.10, 2006-11
04052006-4SYQ-ZRN3