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CDMA #8

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JunningWu opened this issue Jun 1, 2018 · 2 comments
Open

CDMA #8

JunningWu opened this issue Jun 1, 2018 · 2 comments

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@JunningWu
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JunningWu commented Jun 1, 2018 •
edited

CDMA作为Convolution流水线的一环，从SRAM和DRAM中读取数据，并存入CBUF中。CDMA支持多种格式的数据输入，包括Pixel data /Feature data /Uncompressed/compressed weight /WMB /WGS等。CDMA具有两个读通道，AXI接口协议，分别完成数据和权值的读取。CDMA的只发出读请求，且64位对齐访问。

http://nvdla.org/_images/ias_image17_cdma.png

在CDMA的内部，存在4个子模块，分别为CDMA_DC，CDMA_WG，CDMA_IMG和一个权值读取模块CDMA_WT，每个子模块的工作流程一样，只不过数据在存入CBUF的时候顺序不同而已；且某一时刻只有一个子模块处于工作状态。
@JunningWu
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status_0和status_1寄存器位，表示当group0/1使能且consumer相同的时候，为1；不同则为2，未使能则为0.

@JunningWu
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CDMA的工作成流程大致如下：
1.检查CBUF是否有足够的剩余空间存放读取的数据
2.发起读数据请求
3.将数据暂存在共享存储器中
4.根据配置，将数据的顺序重新摆放
5.发起CBUF的写入请求
6.将整理后的数据写入CBUF
7.更新CBUF的相关状态寄存器，以供CDMA查阅

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@JunningWu