13.4.14 Pattern Match

When the content of the incoming data is required in making decisions in real time, the 32-bit DMA Controller can recognize a data pattern in its internal buffer being transferred from the source to the destination locations. The pattern match capability, when enabled, allows a user-programmable data pattern to be compared against a (partial) content of DMABUF[31:0]. Upon match detection, the DMA Controller invokes its interrupt to inform the CPU to take further action. This feature works by using special registers that handle control, status and patterns, as shown in Figure 13-9.