HYB18L256160B Datasheet, PDF (45/58 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
9) 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.
10) May or may not be bank-specific; if multiple banks are to be precharged, each must be in a valid state for precharging.
11) Not bank-specific; BURST TERMINATE affects the most recent READ or WRITE burst, regardless of bank.
Idle
Row Active
Read
Write
TABLE 17
Current state definitions
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
A READ burst has been initiated, with Auto Precharge disabled, and has not yet terminated or
been terminated
A WRITE burst has been initiated, with Auto Precharge disabled, and has not yet terminated or
been terminated
Precharging
Row Activating
Read with AP
Enabled
Write with AP
Enabled
TABLE 18
State Definitions 2
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
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
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
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
Refreshing
Accessing MR
Precharging All
TABLE 19
State Defintions 3
Starts with registration of an AUTO REFRESH command and ends when t_RC is met. Once t_RC is
met, the SDRAM is in the “all banks idle” state
Starts with registration of a MODE REGISTER SET command and ends when t_MRD has been
met. Once t_MRD is met, the SDRAM is in the “all banks idle” state
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
Rev. 1.73, 2006-09
45
01302004-CZ2R-J9SE