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Reset and Reset Configuration
5.1.6
Local Interrupter
The following external interrupts are applied to the MPC8272 using its interrupt controller:
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ABORT (NMI)
ATM UNI interrupt
Fast Ethernet PHY interrupt
PCI interrupt
5.1.6.1
ABORT Interrupt
The ABORT (NMI) is generated by a push-button. When this button is depressed, the IRQ0
input to the MPC8272 is asserted. The purpose of this type of interrupt is to support the use
of resident debugger if any is made available to the board. This interrupt is enabled by
setting the MSR[EE] bit.
To support external (off-board) generation of an NMI, the IRQ0 line is driven by an
open-drain gate to allow for an external h/w, to drive this line also. If an external hardware
indeed does so, it is compulsory that IRQ0 is driven by an open-drain (or open-collector)
gate.
5.1.6.2
ATM UNI Interrupt
To support ATM UNI (User Network I/F) event report by means of interrupt, the interrupt
output of the UNI (INTB) is connected to IRQ5 line of the MPC8272. This IRQ5 input is
shared with the Fast Ethernet PHY Interrupt. Since INTB of the UNI is an open-drain
output, it is possible to connect additional (on and off-board) interrupt requesters on the
same IRQ5, provided that they drive IRQ5 with open-drain gate as well. When an interrupt
request appears in IRQ5, it is necessary to check the source of the interrupt whether it’s the
ATM UNI or the Fast Ethernet PHY.
5.1.7
Fast Ethernet PHY Interrupt
To support the two fast Ethernet transceivers event reports by means of interrupt, the
interrupt outputs of the DM9161 are connected to IRQ5 line of the PowerQUICC II. This
IRQ5 input is shared with the ATM UNI Interrupt.
5.1.8
PCI Interrupt
Each PCI slot can generate up to four interrupts for a total of 12 (3 slot x 4 interrupts each).
Each PCI expansion board can generate an interrupt at any given time. Since there is only
one interrupt input available in the MPC8272, an interrupt controller is used. The interrupt
controller receives all the possible interrupts from the PCI slots and generate one interrupt
(IRQ2) to the MPC8272.
Chapter 5. Module Design
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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
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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