MT41J64M16JT-15E AIT:G Micron, MT41J64M16JT-15E AIT:G Datasheet - Page 105

• Manufacturer Part Number: MT41J64M16JT-15E AIT:G
• Description: DRAM Chip DDR3 SDRAM 1G-Bit 64Mx16 1.5V 96-Pin FBGA
• Manufacturer: Micron

Commands
DESELECT
NO OPERATION
ZQ CALIBRATION LONG
ZQ CALIBRATION SHORT
ACTIVATE
READ
PDF: 09005aef84491df3
1Gb_AIT_AAT_DDR3_SDRAM.pdf – Rev. C 8/11 EN
The DESELT (DES) command (CS# HIGH) prevents new commands from being execu-
ted by the DRAM. Operations already in progress are not affected.
The NO OPERATION (NOP) command (CS# LOW) prevents unwanted commands from
being registered during idle or wait states. Operations already in progress are not affec-
ted.
The ZQ CALIBRATION LONG (ZQCL) command is used to perform the initial calibra-
tion during a power-up initialization and reset sequence (see Figure 45 (page 121)).
This command may be issued at any time by the controller, depending on the system
environment. The ZQCL command triggers the calibration engine inside the DRAM. Af-
ter calibration is achieved, the calibrated values are transferred from the calibration en-
gine to the DRAM I/O, which are reflected as updated R
The DRAM is allowed a timing window defined by either
a full calibration and transfer of values. When ZQCL is issued during the initialization
sequence, the timing parameter
plete, subsequent ZQCL commands require the timing parameter
fied.
The ZQ CALIBRATION SHORT (ZQCS) command is used to perform periodic calibra-
tions to account for small voltage and temperature variations. A shorter timing window
is provided to perform the reduced calibration and transfer of values as defined by tim-
ing parameter
and R
specified in Table 38 (page 56) and Table 39 (page 56).
The ACTIVATE command is used to open (or activate) a row in a particular bank for a
subsequent access. The value on the BA[2:0] inputs selects the bank, and the address
provided on inputs A[n:0] selects the row. This row remains open (or active) 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.
The READ command is used to initiate a burst read access to an active row. The address
provided on inputs A[2:0] selects the starting column address, depending on the burst
length and burst type selected (see Burst Order table for additional information). The
value on input A10 determines whether auto precharge is used. If auto precharge is se-
lected, the row being accessed will be precharged at the end of the READ burst. If auto
TT
impedance error within 64 clock cycles, assuming the maximum sensitivities
t
ZQCS. A ZQCS command can effectively correct a minimum of 0.5% R
105
t
ZQinit must be satisfied. When initialization is com-
1Gb: x8, x16 Automotive DDR3 SDRAM
Micron Technology, Inc. reserves the right to change products or specifications without notice.
ON
t
ZQinit or
and ODT values.
‹ 2010 Micron Technology, Inc. All rights reserved.
t
ZQoper to be satis-
t
ZQoper to perform
Commands
ON