參數(shù)資料
型號(hào)： MT48LC8M16A2FB-8EIT
廠商： Micron Technology, Inc.
英文描述： SYNCHRONOUS DRAM
中文描述： 同步DRAM
文件頁(yè)數(shù)： 25/59頁(yè)
文件大?。?/td> 1822K
代理商： MT48LC8M16A2FB-8EIT
25
128Mb: x4, x8, x16 SDRAM
128MSDRAM_E.p65
–
Rev. E; Pub. 1/02
Micron Technology, Inc., reserves the right to change products or specifications without notice.
2001, Micron Technology, Inc.
128Mb: x4, x8, x16
SDRAM
D
IN
COMMAND
ADDRESS
WRITE
BANK,
COL
n
D
IN
n
NOP
NOP
CLK
T2
T1
T4
T3
T5
T0
CKE
INTERNAL
CLOCK
NOP
D
IN
n
+ 1
D
IN
n
+ 2
NOTE:
For this example, burst length = 4 or greater, and DM
is LOW.
Figure 22
Clock Suspend During WRITE Burst
DON
’
T CARE
CLK
DQ
D
OUT
n
T2
T1
T4
T3
T6
T5
T0
COMMAND
ADDRESS
READ
NOP
NOP
NOP
BANK,
COL
n
NOP
D
OUT
n
+ 1
D
OUT
n
+ 2
D
OUT
n
+ 3
NOTE:
For this example, CAS latency = 2, burst length = 4 or greater, and
DQM is LOW.
CKE
INTERNAL
CLOCK
NOP
Figure 23
Clock Suspend During READ Burst
CLOCK SUSPEND
The clock suspend mode occurs when a column ac-
cess/burst is in progress and CKE is registered LOW. In
the clock suspend mode, the internal clock is deacti-
vated, “freezing” the synchronous logic.
For each positive clock edge on which CKE is sampled
LOW, the next internal positive clock edge is suspended.
Any command or data present on the input pins at the
time of a suspended internal clock edge is ignored; any
data present on the DQ pins remains driven; and burst
counters are not incremented, as long as the clock is
suspended. (See examples in Figures 22 and 23.)
Clock suspend mode is exited by registering CKE
HIGH; the internal clock and related operation will re-
sume on the subsequent positive clock edge.
BURST READ/SINGLE WRITE
The burst read/single write mode is entered by pro-
gramming the write burst mode bit (M9) in the mode
register to a logic 1. In this mode, all WRITE commands
result in the access of a single column location (burst of
one), regardless of the programmed burst length. READ
commands access columns according to the programmed
burst length and sequence, just as in the normal mode of
operation (M9 = 0).
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