參數(shù)資料
型號(hào)： A48P4616
廠商： AMIC Technology Corporation
英文描述： CAP 330PF 50V CERAMIC MONO 5%
中文描述： 16米x 16位DDR內(nèi)存
文件頁(yè)數(shù)： 22/71頁(yè)
文件大小： 2068K
代理商： A48P4616
A48P4616
Preliminary (September, 2005, Version 0.0)
21
AMIC Technology, Corp.
Data from any Read burst may be truncated with a Burst
Terminate command, as shown in timing figure entitled
Terminating a Read Burst: CAS Latencies (Burst Length = 8)
on page 22. The Burst Terminate latency is equal to the read
(CAS) latency, i.e. the Burst Terminate command should be
issued x cycles after the Read command, where x equals the
number of desired data element pairs.
Data from any Read burst must be completed or truncated
before a subsequent Write command can be issued. If
truncation is necessary, the Burst Terminate command must
be used, as shown in timing figure entitled
Read to Write:
CAS Latencies (Burst Length = 4 or 8)
on page 24. The
example is shown for t
DQSS(min)
. The t
DQSS(max)
case, not
shown here, has a longer bus idle time. t
DQSS(min)
and
t
DQSS(max)
are defined in the section on Writes.
A Read burst may be followed by, or truncated with, a
Precharge command to the same bank (provided that Auto
Precharge was not activated).
The Precharge command should be issued x cycles after the
Read command, where x equals the number of desired data
element pairs (pairs are required by the 2n prefetch
architecture). This is shown in timing figure
Read to
Precharge: CAS Latencies (Burst Length = 4 or 8)
on page
25 for Read latencies of 2 and 2.5. Following the Precharge
command, a subsequent command to the same bank cannot
be issued until t
RP
is met. Note that part of the row precharge
time is hidden during the access of the last data elements.
In the case of a Read being executed to completion, a
Precharge command issued at the optimum time (as
described above) provides the same operation that would
result from the same Read burst with Auto Precharge
enabled. The disadvantage of the Precharge command is
that it requires that the command and address busses be
available at the appropriate time to issue the command. The
advantage of the Precharge command is that it can be used
to truncate bursts.
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