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參數(shù)資料
| 型號(hào)： | MPC5200ID |
| 廠商： | Motorola, Inc. |
| 英文描述： | MPC5200 Hardware Specifications |
| 中文描述： | MPC5200的硬件規(guī)格 |
| 文件頁數(shù)： | 70/76頁 |
| 文件大?。?/td> | 1404K |
| 代理商： | MPC5200ID |
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70
MPC5200 Hardware Specifications
MOTOROLA
System Design Information
VDD_CORE/PLL_AVDD and VDD_IO/VDD_IO_MEM should track up to 0.9 V and then separate for the
completion of ramps with VDD_IO/VDD_IO_MEM going to the higher external voltages. One way to
accomplish this is to use a low drop-out voltage regulator.
6.1.2 Power Down Sequence
If VDD_CORE/PLL_AVDD are powered down first, then sense circuits in the I/O pads will cause all output
drivers to be in a high impedance state. There is no limit on how long after VDD_CORE and PLL_AVDD
power down before VDD_IO or VDD_IO_MEM must power down. VDD_CORE should not lag VDD_IO,
VDD_IO_MEM, or PLL_AVDD going low by more than 0.4V during power down or there will be undesired
high current in the ESD protection diodes. There are no requirements for the fall times of the power
supplies.
The recommended power down sequence is as follows:
Drop VDD_CORE/PLL_AVDD to 0V.
Drop VDD_IO/VDD_IO_MEM supplies.
6.2
Each of the independent PLL power supplies require filtering external to the device. The following drawing
is a recommendation for the required filter circuit.
System and CPU Core AVDD power supply filtering
Figure 51 Power Supply Filtering
6.3
The MPC5200 requires external pull-up or pull-down resistors on certain pins.
Pull-up/Pull-down Resistor Requirements
6.3.1 Pull-down Resistor Requirements for TEST pins
The MPC5200 requires pull-down resistors on the test pins TEST_MODE_0, TEST_MODE_1,
TEST_SEL_1.
6.3.2 Pull-up Requirements for the PCI Control Lines
If the PCI interface is NOT used (and internally disabled) the PCI control pins must be terminated as
indicated by the PCI Local Bus specification [4]. This is also required for MOST/Graphics and Large Flash
Mode.
PCI control signals always require pull-up resistors on the motherboard (not the expansion board) to
ensure that they contain stable values when no agent is actively driving the bus. This includes
PCI_FRAME, PCI_TRDY, PCI_IRDY, PCI_DEVSEL, PCI_STOP, PCI_SERR, PCI_PERR, and PCI_REQ.
AVDD device pin
Power
Supply
source
< 1
10
200-400 pF
10
μ
F
F
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
n
.
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