參數(shù)資料
型號： MSC8101M1375F
廠商： FREESCALE SEMICONDUCTOR INC
元件分類： 數(shù)字信號處理
英文描述： 64-BIT, 68.75 MHz, OTHER DSP, PBGA332
封裝： 17 X 17 MM, LIDDED FLIP CHIP, LEAD FREE, PLASTIC, BGA-332
文件頁數(shù)： 47/104頁
文件大?。?/td> 1811K
代理商： MSC8101M1375F
AC Timings
MSC8101 Technical Data, Rev. 18
Freescale Semiconductor
2-7
The following sections include illustrations and tables of clock diagrams, signals, and parallel I/O outputs and
inputs. AC timings are based on a 50 pF load, except where noted otherwise, and 50
transmission line.
2.6.1
Output Buffer Impedances
2.6.2
Start-Up Timing
Starting the device requires coordination among several input sequences including clocking, reset, and power.
Section 2.6.3 describes the clocking characteristics. Section 2.6.4 describes the reset and power-up characteristics.
You must use the following guidelines when starting up an MSC8101 device:
PORESET
and TRST must be asserted externally for the duration of the power-up sequence. See Table 2-14
for timing.
If possible, bring up the VDD and VDDH levels together. For designs with separate power supplies, bring up
the VDDH levels and then the VDD levels (see Figure 2-5 and Figure 2-6).
CLKIN
can start toggling after VDDH reaches its nominal level, but it must toggle before VDD reaches 0.5 V to
guarantee correct device operation (see Figure 2-4 and Figure 2-6).
The following figures show acceptable start-up sequence examples. Figure 2-4 shows a sequence in which VDD and
VDDH are raised together. Figure 2-5 shows a sequence in which CLKIN starts toggling after VDDH reaches its
nominal level and before VDD is applied. Figure 2-6 shows a sequence in which VDD is raised after VDDH and CLKIN
begins to toggle shortly before VDD reaches the 0.5 V level.
Table 2-9.
Output Buffer Impedances
Output Buffers
Typical Impedance (
)
System Bus
35
Memory Controller
35
Parallel I/O
55
Note:
These are typical values at 65°C. The impedance may vary by ±25% depending on device process and operating temperature.
Figure 2-4.
Start-Up Sequence with VDD and VDDH Raised Together
Vo
lt
a
g
e
Time
o.5 V
3.3 V
1.6 V
VDDH Nominal Level
PORESET/TRST Asserted
VDD Nominal Level
CLKIN Starts Toggling
VDD/VDDH Applied
PORESET/TRST Deasserted
1
2.2 V
VDDH = Nominal Value
VDD = Nominal Value
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