MT48H32M32LFB5-6 IT:B Micron, MT48H32M32LFB5-6 IT:B Datasheet - Page 42

• Manufacturer Part Number: MT48H32M32LFB5-6 IT:B
• Manufacturer: Micron

Bank/Row Activation
Figure 14: Example: Meeting
PDF: 09005aef8404b23d
y68m_mobile_lpsdr.pdf – Rev. D 1/11 EN
Command
Before any READ or WRITE commands can be issued to a bank within the SDRAM, a
row in that bank must be opened. This is accomplished via the ACTIVE command,
which selects both the bank and the row to be activated.
After a row is opened with the ACTIVE command, a READ or WRITE command can 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 2.5 clocks, rounded to 3. This is reflected in Figure 14 (page 42), which covers
any case where 2 <
specification limits from time units to clock cycles.)
A subsequent ACTIVE command to a different row in the same bank can only be issued
after the previous active row has been 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 mini-
mum time interval between successive ACTIVE commands to different banks is defined
by
t
RRD.
CLK
t
RCD (MIN) When 2 <
ACTIVE
T0
t
t CK
RCD (MIN)/
t
RCD specification of 20ns with a 125 MHz clock (8ns period)
NOP
t
RCD(MIN)
T1
42
t
t
RCD (MIN)/
CK ≤ 3. (The same procedure is used to convert other
t
t CK
RCD specification.
NOP
Micron Technology, Inc. reserves the right to change products or specifications without notice.
T2
t
1Gb: x32 Mobile LPSDR SDRAM
CK < 3
t CK
READ or
WRITE
t
RCD (MIN) should be divided by
Don’t Care
T3
Bank/Row Activation
© 2010 Micron Technology, Inc. All rights reserved.
t
RC.