https://mp.weixin.qq.com/s/KkkqvekWHG6yrqwHUECRIw
介绍如何定义Wire/Reg/Memory/Prim。
1. DefWire
Wire()表明内括的Data的容器为线，用法为：
Wire()定义如下：
a. 获取一个t的克隆x；
(sourceInfo, x)
(sourceInfo, x))
pushCommand()定义如下：
把命令c即DefWire，加入到forcedUserModule中。
2. DefReg
Reg()定义如下：
同样调用pushCommand()把定义寄存器的命令（DefReg），添加到forcedUserModule中。
3. DefMemory
Mem()定义如下：
调用pushCommand()把定义内存的命令（DefMemory），添加到forcedUserModule中。
4. DefPrim
以加法为例。
作为抽象方法，定义在Num中：
在子类UInt中实现，
5. 附录
Wire():
WireFactory {
= {
(compileOptions.declaredTypeMustBeUnbound) {
)
}
x = t.cloneTypeFull
// Bind each element of x to being a Wire
))
(sourceInfo, x))
(!compileOptions.explicitInvalidate) {
(sourceInfo, x.ref))
}
x
}
}
Reg():
Reg {
/** Creates a register without initialization (reset is ignored). Value does
* not change unless assigned to (using the := operator).
*
: data type for the register
*/
= {
(compileOptions.declaredTypeMustBeUnbound) {
)
}
reg = t.cloneTypeFull
)
))
(sourceInfo, reg, clock))
reg
}
}
Mem():
Mem {
@chiselRuntimeDeprecated
)
(size, t)(UnlocatableSourceInfo, compileOptions)
.
*
number of elements in the memory
data type of memory element
*/
]
] = {
(compileOptions.declaredTypeMustBeUnbound) {
)
}
mt = t.cloneTypeFull
Mem(mt, size)
(sourceInfo, mem, mt, size))
mem
}
}