Again: In the "Component Author Guide" chapter 6.4 you will find the names of the registers to use.
Some useful ref material on DMA -
http://www.cypress.com/documentation/application-notes/an52705-psoc-3-and-psoc-5lp-getting-started-dma AN52705 Getting Started with DMA
http://www.cypress.com/documentation/application-notes/an84810-psoc-3-and-psoc-5lp-advanced-dma-topics AN84810 PSoC® 3 and PSoC 5LP Advanced DMA Topics
http://www.cypress.com/documentation/application-notes/an61102-psoc-3-and-psoc-5lp-adc-data-buffering-using-dma AN61102 PSoC® 3 and PSoC 5LP - ADC Data Buffering Using DMA
http://video.cypress.com/video-library/search/dma/ Videos on DMA
https://www.youtube.com/results?search_query=dma+psoc Videos on DMA (some overlap)
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I think the correct answer is: You can not access the accumulator registers (or any data path register) from verilog.
Because the component author guide says:
...a datapath can contain up to 6 outputs regardless of the data width...
These status signals are generated from comparisons and internal logic in the datapath and do not include data bits directly from the registers or the ALU. It is possible however to access this information by using the shifter to serially shift out the bits in the ALU.