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参数资料
型号： MPC8315VRAGDA
厂商： FREESCALE SEMICONDUCTOR INC
元件分类： 微控制器/微处理器
英文描述： 32-BIT, 400 MHz, MICROPROCESSOR, PBGA620
封装： 29 X 29 MM, 2.23 MM HEIGHT, 1 MM PITCH, LEAD FREE, TEPBGAII-620
文件页数： 17/112页
文件大小： 1283K
代理商： MPC8315VRAGDA
MPC8315E PowerQUICC II Pro Processor Hardware Specifications, Rev. 0
12
Freescale Semiconductor
Electrical Characteristics
3.2
Power Sequencing
The MPC8315E does not require the core supply voltage (VDD and VDDC) and I/O supply voltages
(GVDD, LVDDx_ON, LVDDx_OFF, NVDDx_ON and NVDDx_OFF) to be applied in any particular
order. During the power ramp up, before the power supplies are stable, if the I/O voltages are supplied
before the core voltage, there may be a period of time when all input and output pins be actively driven
and cause contention and/or excessive current. In order to avoid actively driving the I/O pins and to
eliminate excessive current draw, apply the continuous core voltage (VDDC) before the continuous I/O
voltages (LVDDx_ON and NVDDx_ON) and switchable core voltage (VDD) before the switchable I/O
voltages (GVDD, LVDDx_OFF, and NVDDx_OFF). PORESET should be asserted before the continuous
power supplies fully ramp up. In the case where the core voltage is applied first, the core voltage supply
must rise to 90% of its nominal value before the I/O supplies reach 0.7 V, see Figure 3. Once all the power
supplies are stable, wait for a minimum of 32 clock cycles before negating PORESET.
The I/O power supply ramp-up slew rate should be slower than 4V/100
μs, this requirement is for ESD
circuit.
Figure 3 shows the power-up sequencing for switchable and continuous supplies.
Figure 3. Power-Up Sequencing
DDR signal1
18
GVDD = 2.5 V
DDR2 signal 1
18
GVDD = 1.8 V
DUART, system control, I2C, JTAG,SPI
42
NVDD = 3.3 V
GPIO signals
42
NVDD = 3.3 V
eTSEC
42
LVDD = 3.3 V / 2.5 V
1 Output Impedance can also be adjusted through configurable options in DDR Control Driver Register
(DDRCDR). See the
MPC8315E PowerQUICC II Pro Host Processor Reference Manual.
Table 3. Output Drive Capability (continued)
Driver Type
Output Impedance
(
Ω)
Supply
Voltage
Continuous I/O Voltage
Continuous Core Voltage
0.7 V
90%
t
V
Switchable I/O Voltage
Switchable Core Voltage (VDD)
0.7 V
90%
t
V
Power sequence for continuous power supplies
Power sequence for switchable power supplies
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