读HLS Bluebook(三)之 IO and Memories

最新推荐文章于 2026-01-07 23:26:44 发布

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最新推荐文章于 2026-01-07 23:26:44 发布 · 204 阅读

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#c++ #开发语言

本文探讨了HLS中无条件IO（如通过引用和值传递）和有条件IO的概念。无条件IO类似于“wire”类型，主要用于控制类型接口或II=1的流水线设计。通过引用传递时，数据存储在外部；而通过值传递则在设计内部进行寄存。有条件IO引入了握手协议，降低了IO流量并解决了同步问题。

IO主要包括通过数值传递和通过指针(或references\数组)。

Unconditional IO

对应于"wire"类型，没有握手协议。

Unconditional IO is used most often for either control type interfaces, where the IO does not change, on in designs that are pipelined with II=1 and the IO is read or written every clock cycle.

具体细分如下：

Pass by Reference

Pass by reference is when a variable is declared as either a pointer or a reference on the design interface. This means that the data that the variable “points to” or “refers to” is stored externally. In other words the “data” is stored off-chip.

Example 5-1. Unconditional IO Passed by Reference
void accumulate(int din[4], int &dout, int &threshold, bool &flag){
   
    
	int acc=0; 
	ACCUM:for