pga: pin-grid array(引脚网格阵列)，耗电大
post-risc
pr(performance rate，性能比率)
psn(processor serial numbers，处理器序列号)
pib(processor in a box，盒装处理器)
ppga(plastic pin grid array，塑胶针状矩阵封装)
pqfp(plastic quad flat package，塑料方块平面封装)
raw(read after write，写后读)
register contention(抢占寄存器)
register pressure(寄存器不足)
