HYB18M1G16 Datasheet, PDF (49/65 Pages) Qimonda AG – 1-Gbit x16 DDR Mobile-RAM

Data Sheet
HY[B/E]18M1G16[0/1]BF
1-Gbit DDR Mobile-RAM
Current State CS RAS CAS WE Command / Action
Note
Write (Auto-
L
HL
H READ (truncate Write and start Read burst)
Precharge
Disabled)
L
H
L
L
WRITE (truncate Write and start Write burst)
L
L
H
L
PRECHARGE (truncate Write burst, start Precharge)
1)2)3)4)5)6)8)12)
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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:
The bank has been precharged, and t_RP has been met.
Row Active:
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:
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.
Write with AP
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.
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.
Rev.1.0, 2007-03
49
10242006-Y557-TZXW