參數(shù)資料
型號(hào)： MSC8122TVT6400
廠商： FREESCALE SEMICONDUCTOR INC
元件分類： 數(shù)字信號(hào)處理
英文描述： 32-BIT, 400 MHz, OTHER DSP, PBGA431
封裝： LEAD FREE, FCBGA-431
文件頁(yè)數(shù)： 33/48頁(yè)
文件大?。?/td> 1158K
代理商： MSC8122TVT6400
MSC8122 Quad Digital Signal Processor Data Sheet, Rev. 16
Freescale Semiconductor
39
3
Hardware Design Considerations
The following sections discuss areas to consider when the MSC8122 device is designed into a system.
3.1
Use the following guidelines for start-up and power-down sequences:
Assert PORESET and TRST before applying power and keep the signals driven low until the power reaches the
required minimum power levels. This can be implemented via weak pull-down resistors.
CLKIN
can be held low or allowed to toggle during the beginning of the power-up sequence. However, CLKIN must
start toggling before the deassertion of PORESET and after both power supplies have reached nominal voltage levels.
If possible, bring up VDD/VCCSYN and VDDH together. If it is not possible, raise VDD/VCCSYN first and then bring up
VDDH. VDDH should not exceed VDD/VCCSYN until VDD/VCCSYN reaches its nominal voltage level. Similarly, bring both
voltage levels down together. If that is not possible reverse the power-up sequence, with VDDH going down first and
then VDD/VCCSYN.
Note:
This recommended power sequencing for the MSC8122 is different from the MSC8102. See Section 2.5.2 for
start-up timing specifications.
External voltage applied to any input line must not exceed the I/O supply VDDH by more than 0.8 V at any time, including during
power-up. Some designs require pull-up voltages applied to selected input lines during power-up for configuration purposes.
This is an acceptable exception to the rule. However, each such input can draw up to 80 mA per input pin per device in the
system during start-up.
During the power-up sequence, if VDD rises before VDDH (see Figure 6), current can pass from the VDD supply through the
device ESD protection circuits to the VDDH supply. The ESD protection diode can allow this to occur when VDD exceeds VDDH
by more than 0.8 V. Design the power supply to prevent or minimize this effect using one of the following optional methods:
Figure 31. Test Access Port Timing Diagram
Figure 32. TRST Timing Diagram
TCK
(Input)
TDI
(Input)
TDO
(Output)
TDO
(Output)
VIH
VIL
Input Data Valid
Output Data Valid
TMS
708
709
710
711
TCK
(Input)
TRST
(Input)
713
712
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