HYB18L128160BF Datasheet, PDF (36/53 Pages) Infineon Technologies AG – DRAMs for Mobile Applications

HY[B/E]18L128160B[C/F]-7.5
128-Mbit Mobile-RAM
Functional Description
The BURST TERMINATE command is used to truncate READ or WRITE bursts (with Auto Precharge disabled).
The most recently registered READ or WRITE command prior to the BURST TERMINATE command will be
truncated, as shown in Figure 18 and Figure 30, respectively.
The BURST TERMINATE command is not allowed for truncation of READ or WRITE bursts with Auto Precharge
enabled.
2.4.8 PRECHARGE
CLK
CKE
CS
RAS
CAS
WE
A0-A9
A11
A10
BA0,BA1
(High)
All Banks
One Bank
BA
= Don't Care
BA = Bank Address
(if A10 = L, otherwise Don't Care)
Figure 36 PRECHARGE Command
The PRECHARGE command is used to deactivate (close) the open row in a particular bank or the open row in all
banks. The bank(s) will be available for a subsequent row access a specified time (t_RP) after the PRECHARGE
command is issued. Input A10 determines whether one or all banks are to be precharged, and in the case where
only one bank is to be precharged, inputs BA0, BA1 select the bank. Otherwise BA0, BA1 are treated as “Don’t
Care”.
Once a bank has been precharged, it is in the idle state and must be activated prior to any READ or WRITE
commands being issued to that bank. A PRECHARGE command will be treated as a NOP if there is no open row
in that bank, or if the previously open row is already in the process of precharging.
2.4.8.1 AUTO PRECHARGE
Auto Precharge is a feature which performs the same individual-bank precharge functions described above, but
without requiring an explicit command. This is accomplished by using A10 to enable Auto Precharge in conjunction
with a specific READ or WRITE command. A precharge of the bank/row that is addressed with the READ or
WRITE command is automatically performed upon completion of the READ or WRITE burst. Auto Precharge is
nonpersistent in that it is either enabled or disabled for each individual READ or WRITE command. Auto Precharge
ensures that the precharge is initiated at the earliest valid stage within a burst. The user must not issue another
command to the same bank until the precharge (t_RP) is completed. This is determined as if an explicit
PRECHARGE command was issued at the earliest possible time, as described for each burst type.
Data Sheet
36
V1.4, 2004-04-30