MT41J64M16JT-15E AIT:G Micron, MT41J64M16JT-15E AIT:G Datasheet - Page 133

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

Mode Register 3 (MR3)
Figure 54: Mode Register 3 (MR3) Definition
MULTIPURPOSE REGISTER (MPR)
PDF: 09005aef84491df3
1Gb_AIT_AAT_DDR3_SDRAM.pdf – Rev. C 8/11 EN
Notes:
back to ODT (R
R
namic ODT (R
and
Dynamic ODT is only applicable during WRITE cycles. If ODT (R
namic ODT (R
one other. Dynamic ODT is not available during write leveling mode, regardless of the
state of ODT (R
tion (ODT) (page 179).
The mode register 3 (MR3) controls additional functions and features not available in
the other mode registers. Currently defined is the MULTIPURPOSE REGISTER (MPR).
This function is controlled via the bits shown in Figure 54 (page 133). The MR3 is pro-
grammed via the LOAD MODE command and retains the stored information until it is
programmed again or until the device loses power. Reprogramming the MR3 register
will not alter the contents of the memory array, provided it is performed correctly. The
MR3 register must be loaded when all banks are idle and no data bursts are in progress,
and the controller must wait the specified time
sequent operation.
The MULTIPURPOSE REGISTER function is used to output a predefined system timing
calibration bit sequence. Bit 2 is the master bit that enables or disables access to the
MPR register, and bits 1 and 0 determine which mode the MPR is placed in. The basic
concept of the multipurpose register is shown in Figure 55 (page 134).
If MR3[2] is a 0, then the MPR access is disabled, and the DRAM operates in normal
mode. However, if MR3[2] is a 1, then the DRAM no longer outputs normal read data
but outputs MPR data as defined by MR3[0, 1]. If MR3[0, 1] is equal to 00, then a prede-
fined read pattern for system calibration is selected.
M15
TT,nom
0
0
1
1
1. MR3[16 and 13:3] are reserved for future use and must all be programmed to 0.
2. When MPR control is set for normal DRAM operation, MR3[1, 0] will be ignored.
3. Intended to be used for READ synchronization.
M14
t
ADC.
0
1
0
1
0 1
16
BA2
value will be High-Z. Special timing parameters must be adhered to when dy-
Mode register set 1 (MR1)
Mode register set 2 (MR2)
Mode register set 3 (MR3)
Mode register set (MR0)
15
1
BA1
Mode Register
1
14
BA0
TT(WR)
TT(WR)
TT,nom
TT,nom
0 1 0 1
13
A13
12
) is enabled: ODTLcnw, ODTLcnw4, ODTLcnw8, ODTH4, ODTH8,
) is still permitted. R
A12 A11
) at the completion of the WRITE burst. If R
). For details on dynamic ODT operation, refer to On-Die Termina-
0 1 0 1 0 1 0 1
11
10
A10
133
9
A9
M2
0
1
8
A8
1Gb: x8, x16 Automotive DDR3 SDRAM
Normal DRAM operations 2
0 1
7
Dataflow from MPR
A7 A6 A5 A4 A3
0 1
MPR Enable
Micron Technology, Inc. reserves the right to change products or specifications without notice.
6
TT,nom
0 1 0 1 0 1
5
4
and R
t
MRD and
3
MPR
2
TT(WR)
A2 A1 A0
MPR_RF
1
Mode Register 3 (MR3)
M1
0
0
1
1
t
MOD before initiating a sub-
M0
can be used independent of
0
0
1
0
1
‹ 2010 Micron Technology, Inc. All rights reserved.
Predefined pattern 3
MPR READ Function
TT,nom
TT,nom
Address bus
Mode register 3 (MR3)
Reserved
Reserved
Reserved
) is disabled, dy-
is disabled, the