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参数资料
| 型号： | MSC8256TVT800B |
| 厂商： | FREESCALE SEMICONDUCTOR INC |
| 元件分类： | 数字信号处理 |
| 英文描述： | 0-BIT, OTHER DSP, PBGA783 |
| 封装： | 29 X 29 MM, LEAD FREE, PLASTIC, FCBGA-783 |
| 文件页数： | 49/68页 |
| 文件大小： | 910K |
| 代理商： | MSC8256TVT800B |
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Hardware Design Considerations
MSC8256 Six-Core Digital Signal Processor Data Sheet, Rev. 3
Freescale Semiconductor
53
3
Hardware Design Considerations
The following sections discuss areas to consider when the MSC8256 device is designed into a system.
3.1
Power Supply Ramp-Up Sequence
The following subsections describe the required device initialization sequence.
3.1.1
Clock, Reset, and Supply Coordination
Starting the device requires coordination between several inputs including: clock, reset, and power supplies. Follow this
guidelines when starting up an MSC8256 device:
PORESET and TRST must be asserted externally for the duration of the supply ramp-up, using the VDDIO supply.
TRST deassertion does not have to be synchronized with PORESET deassertion. However, TRST must be deasserted
before normal operation begins to ensure correct functionality of the device.
CLKIN should toggle at least 32 cycles before PORESET deassertion to guarantee correct device operation. The 32
cycles should only be counted from the time after VDDIO reaches its nominal value (see timing 1 in Figure 33).
CLKIN should either be stable low during ramp-up of VDDIO supply (and start its swings after ramp-up) or should
swing within VDDIO range during VDDIO ramp-up, so its amplitude grows as VDDIO grows during ramp-up.
Figure 33 shows a sequence in which VDDIO ramps-up after VDD and CLKIN begins to toggle with the raise of VDDIO supply.
Note:
For details on power-on reset flow and duration, see the Reset chapter in the MSC8256 Reference Manual.
Figure 33. Supply Ramp-Up Sequence with VDD Ramping Before VDDIO and CLKIN Starting With VDDIO
Vo
lt
a
g
e
Time
VDDIO Nominal
PORESET/TRST asserted
VDD Nominal
CLKIN starts toggling
VDD applied
PORESET deasserted
1
VDDIO applied
VDDIO = Nominal
VDD = Nominal
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相关代理商/技术参数 |
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|---|---|
| MSC83301 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:RF & MICROWAVE TRANSISTORS GENERAL PURPOSE AMPLIFIER APPLICATIONS |
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| MSC85623 | 制造商:ASI 制造商全称:ASI 功能描述:NPN RF TRANSISTOR |
| MSC8W38T15-L6 | 功能描述:电缆束带 MS Strapping, 316 SS, Nylon FC, .38" (9. RoHS:否 制造商:Phoenix Contact 产品:Cable Tie Mounts 类型:Adhesive 颜色:Black 材料:Acrylonitrile Butadiene Styrene (ABS) 长度:19 mm 宽度:19 mm 抗拉强度: |
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