256Mb: x4, x8, x16 SDRAM
Commands
PRECHARGE
The PRECHARGE command is used to deactivate 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 (tRP) 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
precharged, inputs BA0 and BA1 select the bank. Otherwise BA0 and BA1 are treated as
“Don’t Care.” After a bank has been precharged, it is in the idle state and must be acti-
vated prior to any READ or WRITE commands are issued to that bank.
Figure 17: PRECHARGE Command
CLK
CKE HIGH
CS#
RAS#
CAS#
WE#
Address
A10
All banks
Bank selected
Bank address
BA0, BA1
Valid address
Don’t Care
BURST TERMINATE
The BURST TERMINATE command is used to truncate either fixed-length or continu-
ous page bursts. The most recently registered READ or WRITE command prior to the
BURST TERMINATE command is truncated.
PDF: 09005aef8091e6d1
256Mb_sdr.pdf - Rev. R 10/12 EN
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