NTC Proprietary
Level: Property
DDR3(L)-2Gb SDRAM
NT5CB(C)256M8JQ/NT5CB(C)128M16JR
ACTIVE Command
The ACTIVE command is used to open (or activate) a row in a particular bank for subsequent access. The value on the
BA0-BA2 inputs selects the bank, and the addresses provided on inputs A0-A15 selects the row. These rows remain active
(or open) for accesses until a precharge command is issued to that bank. A PRECHARGE command must be issued before
opening a different row in the same bank.
PRECHARGE Command
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 activation a specified time (tRP) after the PRECHARGE command is issued,
except in the case of concurrent auto precharge, where a READ or WRITE command to a different bank is allowed as long
as it does not interrupt the data transfer in the current bank and does not violate any other timing parameters. 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 is allowed if there is no open row in that bank (idle bank) or if the previously open row
is already in the process of precharging. However, the precharge period will be determined by the last PRECHARGE
command issued to the bank.
Version 1.4
05/2019
44
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