MT46V64M16P-6T IT:A Micron, MT46V64M16P-6T IT:A Datasheet - Page 50
MT46V64M16P-6T IT:A
Manufacturer Part Number
MT46V64M16P-6T IT:A
Description
DRAM Chip DDR SDRAM 1G-Bit 64Mx16 2.5V 66-Pin TSOP Tray
Manufacturer
Micron
Datasheet
1.MT46V64M16P-6TITA.pdf
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Figure 23:
ACTIVE
PDF: 09005aef80768abb/Source: 09005aef82a95a3a
DDR_x4x8x16_Core2.fm - 1Gb DDR: Rev. J; Core DDR Rev. E 7/11 EN
Extended Mode Register Definition
Notes:
1. n is the most significant row address bit from Table 2 on page 2.
2. The QFC# option is not supported.
After a row is opened with an ACTIVE command, a READ or WRITE command may be
issued to that row, subject to the
the clock period and rounded up to the next whole number to determine the earliest
clock edge after the ACTIVE command on which a READ or WRITE command can be
entered. For example, a
results in 2.7 clocks rounded to 3. This is reflected in Figure 24 on page 51, which covers
any case where 2 <
same procedure is used to convert other specification limits from time units to clock
cycles).
A row remains 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.
A subsequent ACTIVE command to a different row in the same bank can only be issued
after the previous active row has been “closed” (precharged). The minimum time
interval between successive ACTIVE commands to the same bank is defined by
A subsequent ACTIVE command to another bank can be issued while the first bank is
being accessed, which results in a reduction of total row-access overhead. The minimum
time interval between successive ACTIVE commands to different banks is defined by
t
Mn + 2
RRD.
0
0
1
1
Mn + 1
En
0
–
0
1
0
1
. . .
0
–
n + 2
Mode Register Definition
Base mode register
Extended mode register
Reserved
Reserved
BA1
E9
0
0
–
E8
n + 1
0
–
BA0
t
1
RCD (MIN)/
E7
0
–
n 1
An
E6
t
0
–
. . .
RCD specification of 20ns with a 133 MHz clock (7.5ns period)
. . .
Operating Mode
E5
0
–
9
A9
50
E4
0
–
8
A8
t
CK d 3 (Figure 24 also shows the same case for
t
E3
RCD specification.
0
–
7
A7 A6 A5 A4 A3
E2
6
0
–
2
Micron Technology, Inc., reserves the right to change products or specifications without notice.
E1
0
1
5
E1, E0
Valid
–
4
Drive Strength
3
Reduced
Normal
E0
Operating Mode
0
1
2
A2 A1 A0
DS
Reserved
Reserved
1Gb: x4, x8, x16 DDR SDRAM
1
DLL
t
RCD (MIN) should be divided by
0
Disable
Enable
DLL
Address bus
Extended mode
register (Ex)
©2000 Micron Technology, Inc. All rights reserved.
Operations
t
RRD; the
t
RC.
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