AS4C128M8D3L Datasheet, PDF (43/88 Pages) Alliance Semiconductor Corporation – AS4C128M8D3L - 78-ball FBGA PACKAGE

1Gb DDR3L – AS4C128M8D3L
 Self-Refresh Temperature Range - SRT
SRT applies to devices supporting Extended Temperature Range only. If ASR=0, the Self-Refresh Temperature
(SRT) Range bit must be programmed to guarantee proper self-refresh operation. If SRT=0, then the DRAM will set
an appropriate refresh rate for Self-Refresh operation in the Normal Temperature Range. If SRT=1, then the DRAM
will set an appropriate, potentially different, refresh rate to allow Self-Refresh operation in either the Normal or
Extended Temperature Ranges. The value of the SRT bit can effect self-refresh power consumption, please refer to
IDD table for details.
Table 23. Self-Refresh mode summary
MR2 MR2
A[6] A[7]
Self-Refresh operation
Allowed Operating
Temperature Range
for Self-Refresh mode
0
0 Self-Refresh rate appropriate for the Normal Temperature Range
Normal (0 ~ 85C)
Self-Refresh appropriate for either the Normal or Extended Temperature
0
1
Ranges. The DRAM must support Extended Temperature Range. The Normal and Extended
value of the SRT bit can effect self-refresh power consumption, please (0 ~ 95C)
refer to the IDD table for details.
1
0
ASR enabled (for devices supporting ASR and Normal Temperature
Range).Self-Refresh power consumption is temperature dependent.
Normal (0 ~ 85C)
1
0
ASR enabled (for devices supporting ASR and Extended Temperature
Range).Self-Refresh power consumption is temperature dependent.
Normal and Extended
(0 ~ 95C)
1
1 Illegal
 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-A13 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.
Confidential
43
Rev. 2.0
Aug. /2014