说明：  主要介绍了FPGA 嵌入式硬核(PowerPC405) 的特点和内核结构,并且详细阐述了在FPGA 嵌入式硬核中移植VxWorks 的方法并予以实现
(The symmet ric att ribute is an important att ribute of plutonium component . Plutoni2 um component is generally installed in sealed container When the symmet ry axis of plutonium component coincide with the symmet ry axis of container , The radiation dist ributing out of the sealed is normal school . When the symmet ry axis of plutonium component isn’t superposition with the symmet ry axis of container , The radiation dist ributing out of the Sealed container isn’t normal school , The estimation is consequently inaccuracy. This article simulated the radiation dist ributing in theory and investigated the effect of orientation2error .)