參數(shù)資料
型號： MC56F8347VVFE
廠商： FREESCALE SEMICONDUCTOR INC
元件分類： 數(shù)字信號處理
英文描述： 16-BIT, 120 MHz, OTHER DSP, PBGA160
封裝： ROHS COMPLIANT, MAPBGA-160
文件頁數(shù)： 45/172頁
文件大?。?/td> 2620K
代理商： MC56F8347VVFE
External Memory Interface Timing
56F8347 Technical Data, Rev.11
Freescale Semiconductor
139
Preliminary
DCAOE and DCAEO are calculated as follows:
The timing of write cycles is different when WWS = 0 than when WWS > 0. Therefore, some parameters
contain two sets of numbers to account for this difference. Use the “Wait States Configuration” column
of Table 10-16 to make the appropriate selection.
Figure 10-4 External Memory Interface Timing
Note:
When multiple lines are given for the same wait state configuration, calculate each and then select the
smallest or most negative.
DCAOE =
=
0.5 - MAX XTAL duty cycle, if ZSRC selects prescaler clock and the prescaler is set to
÷ 1
0.0 all other cases
DCAEO =
=
MIN XTAL duty cycle - 0.5, if ZSRC selects prescaler clock and the prescaler is set to
÷ 1
0.0 all other cases
Example of DCAOE and DCAEO calculation:
Assuming prescaler is set for
÷ 1 and prescaler clock is selected by ZSRC, if XTAL duty cycle
ranges between 45% and 60% high;
DCAOE = .50 - .60 = - 0.1
DCAEO = .45 - .50 = - 0.05
tDRD
tRDD
tAD
tDOH
tDOS
tDWR
tRDWR
tWAC
tWRRD
tWR
tAWR
tWRWR
tARDD
tRDA
tRDRD
tRD
tARDA
Data Out
Data In
A0-Axx,CS
RD
WR
D0-D15
Note: During read-modify-write instructions and internal instructions, the address lines do not change state.
Because
of
an
order
from
the
United
States
International
Trade
Commission,
BGA-packaged
product
lines
and
part
numbers
indicated
here
currently
are
not
available
from
Freescale
for
import
or
sale
in
the
United
States
prior
to
September
2010:
MC56F8147VVFE,MC56F8347VVFE
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