参数资料
型号: MPC8548ECPXAQGB
厂商: Freescale Semiconductor
文件页数: 63/151页
文件大小: 0K
描述: MPU POWERQUICC III 783-PBGA
产品培训模块: MPC8548 PowerQUICC III Processors
标准包装: 1
系列: MPC85xx
处理器类型: 32-位 MPC85xx PowerQUICC III
速度: 1.0GHz
电压: 1.1V
安装类型: 表面贴装
封装/外壳: 783-BBGA,FCBGA
供应商设备封装: 783-FCPBGA(29x29)
包装: 托盘
MPC8548E PowerQUICC III Integrated Processor Hardware Specifications, Rev. 9
Freescale Semiconductor
19
RESET Initialization
5
RESET Initialization
This section describes the AC electrical specifications for the RESET initialization timing requirements of
the device. The following table provides the RESET initialization AC timing specifications for the DDR
SDRAM component(s).
The following table provides the PLL lock times.
5.1
Power-On Ramp Rate
This section describes the AC electrical specifications for the power-on ramp rate requirements.
Controlling the maximum power-on ramp rate is required to avoid falsely triggering the ESD circuitry. The
following table provides the power supply ramp rate specifications.
Table 8. RESET Initialization Timing Specifications
Parameter/Condition
Min
Max
Unit
Notes
Required assertion time of HRESET
100
s—
Minimum assertion time for SRESET
3
SYSCLKs
1
PLL input setup time with stable SYSCLK before HRESET negation
100
s—
Input setup time for POR configs (other than PLL config) with respect to
negation of HRESET
4
SYSCLKs
1
Input hold time for all POR configs (including PLL config) with respect to
negation of HRESET
2
SYSCLKs
1
Maximum valid-to-high impedance time for actively driven POR configs with
respect to negation of HRESET
5
SYSCLKs
1
Note:
1. SYSCLK is the primary clock input for the device.
Table 9. PLL Lock Times
Parameter/Condition
Min
Max
Unit
Core and platform PLL lock times
100
s
Local bus PLL lock time
50
s
PCI/PCI-X bus PLL lock time
50
s
Table 10. Power Supply Ramp Rate
Parameter
Min
Max
Unit
Notes
Required ramp rate for MVREF
3500
V/s
1
Required ramp rate for VDD
4000
V/s
1, 2
Note:
1. Maximum ramp rate from 200 to 500 mV is most critical as this range may falsely trigger the ESD circuitry.
2. VDD itself is not vulnerable to false ESD triggering; however, as per Section 22.2, “PLL Power Supply Filtering,the
recommended AVDD_CORE, AVDD_PLAT, AVDD_LBIU, AVDD_PCI1 and AVDD_PCI2 filters are all connected to VDD.
Their ramp rates must be equal to or less than the VDD ramp rate.
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