Data Sheet.
HY[B/E]18L512160BF-7.5
512-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.
TABLE 17
Current state definitions
Idle
The bank has been precharged, and tRP has been met.
Row Active
A row in the bank has been activated, and tRCD has been met. No data bursts/accesses and no
register accesses are in progress.
Read
Write
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.
TABLE 18
State Definitions 2
Precharging
Starts with registration of a PRECHARGE command and ends when tRP is met. Once tRP is met,
the bank is in the “idle” state.
Row Activating
Starts with registration of an ACTIVE command and ends when tRCD is met. Once tRCD 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 tRP
has been met. Once tRP is met, the bank is in the idle state.
Write with AP
Starts with registration of a WRITE command with Auto Precharge enabled and ends when tRP
has been met. Once tRP is met, the bank is in the idle state.
Enabled
TABLE 19
State Defintions 3
Refreshing
Starts with registration of an AUTO REFRESH command and ends when tRC is met. Once tRC is
met, the SDRAM is in the “all banks idle” state.
Accessing Mode
Register
Starts with registration of a MODE REGISTER SET command and ends when tMRD has been
met. Once tMRD is met, the SDRAM is in the “all banks idle” state.
Precharging All
Starts with registration of a PRECHARGE ALL command and ends when tRP is met. Once tRP is
met, all banks are in the idle state.
Rev. 1.22, 2006-12
44
01132005-06IU-IGVM
QIMONDA [ QIMONDA AG ]
