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參數(shù)資料
| 型號： | MT48H16M16LFFG |
| 廠商： | Micron Technology, Inc. |
| 英文描述： | MOBILE SDRAM |
| 中文描述： | 移動SDRAM |
| 文件頁數(shù)： | 14/58頁 |
| 文件大?。?/td> | 1451K |
| 代理商： | MT48H16M16LFFG |
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14
256Mb: x16 Mobile SDRAM
MobileRamY26L_A.p65 – Pub. 5/02
Micron Technology, Inc., reserves the right to change products or specifications without notice.
2002, Micron Technology, Inc.
256Mb: x16
MOBILE SDRAM
ADVANCE
CLK
T2
T1
T3
T0
t
COMMAND
NOP
ACTIVE
READ or
WRITE
T4
NOP
RCD
DON’T CARE
Operation
BANK/ROW ACTIVATION
Before any READ or WRITE commands can be is-
sued to a bank within the SDRAM, a row in that bank
must be “opened.” This is accomplished via the AC-
TIVE command, which selects both the bank and the
row to be activated (see Figure 3).
After opening a row (issuing an ACTIVE command),
a READ or WRITE command may be issued to that row,
subject to the
t
RCD specification.
t
RCD (MIN) should
be divided by 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
t
RCD specifi-
cation of 20ns with a 125 MHz clock (8ns period) results
in 2.5 clocks, rounded to 3. This is reflected in Figure 4,
which covers any case where 2 <
t
RCD (MIN)/
t
CK
≤
3.
(The same procedure is used to convert other specifi-
cation 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 “closed” (precharged). The mini-
mum time interval between successive ACTIVE com-
mands to the same bank is defined by
t
RC.
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 over-
head. The minimum time interval between successive
ACTIVE commands to different banks is defined by
t
RRD.
Figure 4
Example: Meeting
t
RCD (MIN) When 2 <
t
RCD (MIN)/
t
CK
<
3
Figure 3
Activating a Specific Row in a
Specific Bank
CS#
WE#
CAS#
RAS#
CKE
CLK
A0-A12
ROW
ADDRESS
DON’T CARE
HIGH
BA0, BA1
BANK
ADDRESS
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