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Chapter 5
Module Design
This chapter provides information about the functionality and design details of the various
modules that constitute the MPC8272ADS.
5.1
Reset and Reset Configuration
The following are reset sources on the MPC8272ADS:
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5.1.1
Power-on reset
Manual hard reset
Manual soft reset
PCI bus reset
MPC8272 internal sources. For more information, see the MPC8272 PowerQUICC
II TM Family Reference Manual .
Power-On Reset
The power-on reset to the MPC8272 initializes the processor state after power-on. A
dedicated logic using Seiko S-80728AN-DR-T1, which is a voltage detector of 2.8V +/-
2.4%, assert s PORESET input to the PowerQUICC II for a period of ~2.5sec. This time
period is sufficient to cover the V DDL stabilization also, powered by a different voltage
regulator. It is assumed that the stabilization time for both linear regulators (see Section 7.1,
“Power Supply”) are about the same. Furthermore, power-on reset may be generated
manually by an on-board dedicated push-button (SW1). Power-on reset can also be
generated by the JTAG logic, which is integrated with BCSR.
5.1.2
Power-On Reset Configuration
At the end of Power - On reset sequence, MODCK(1:3) are sampled by the MPC8272 to
configure the various clock modes of the MPC8272 (core, cpm, bus, PCI...). Selection
between the MODCK(1:3) combination options is done by means of dip-switches on the
mother board while PCI_MODCKH(0:3) are obtained from the relevant dedicated
dip-switches.
Chapter 5. Module Design
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相关代理商/技术参数
MPC8272CVR 制造商:MOTOROLA 制造商全称:Motorola, Inc 功能描述:MPC8272 PowerQUICC II Family Hardware Specifications
MPC8272CVRB 制造商:FREESCALE 制造商全称:Freescale Semiconductor, Inc 功能描述:PowerQUICC II⑩ Family Hardware Specifications
MPC8272CVRE 制造商:FREESCALE 制造商全称:Freescale Semiconductor, Inc 功能描述:PowerQUICC II⑩ Family Hardware Specifications
MPC8272CVRI 制造商:FREESCALE 制造商全称:Freescale Semiconductor, Inc 功能描述:PowerQUICC II⑩ Family Hardware Specifications
MPC8272CVRM 制造商:FREESCALE 制造商全称:Freescale Semiconductor, Inc 功能描述:PowerQUICC II⑩ Family Hardware Specifications
MPC8272CVRMIBA 功能描述:微处理器 - MPU 266 MHz 505.4 MIPS RoHS:否 制造商:Atmel 处理器系列:SAMA5D31 核心:ARM Cortex A5 数据总线宽度:32 bit 最大时钟频率:536 MHz 程序存储器大小:32 KB 数据 RAM 大小:128 KB 接口类型:CAN, Ethernet, LIN, SPI,TWI, UART, USB 工作电源电压:1.8 V to 3.3 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:FBGA-324
MPC8272CVRP 制造商:FREESCALE 制造商全称:Freescale Semiconductor, Inc 功能描述:PowerQUICC II⑩ Family Hardware Specifications
MPC8272CVRPIEA 功能描述:微处理器 - MPU 300 MHz 570 MIPS RoHS:否 制造商:Atmel 处理器系列:SAMA5D31 核心:ARM Cortex A5 数据总线宽度:32 bit 最大时钟频率:536 MHz 程序存储器大小:32 KB 数据 RAM 大小:128 KB 接口类型:CAN, Ethernet, LIN, SPI,TWI, UART, USB 工作电源电压:1.8 V to 3.3 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:FBGA-324