cth_dma_ctl (0x401C)

Table 1. cth _dma_ctl (0x401C)
Bit(s) Default Access Description
31:28 Reserved
27:23 Reserved
22:18 Reserved
17:13 Reserved
12 Reserved
11 1'b0 RW When the CTH engine’s user-side interface is set to AXI4-Stream mode, setting this bit to 1 disables CTH writeback information and enables the default writeback behavior.
10 0x0 RW Writeback enable bit for polling mode. When set to 1, after the CTH engine completes data transfer for descriptors with the Completed flag, the writeback engine writes the number of completed descriptors to a preconfigured memory address for the host to check transfer completion.
9:7 Reserved
6 1'b0 RW When set to 1, enables logging of descriptors with the Completed flag in the Status register. If the corresponding interrupt enable bit is 1, an interrupt is generated.
5 1'b0 RW When set to 1, enables logging of descriptors with the Stop flag in the Status register. If the corresponding interrupt enable bit is 1, an interrupt is generated.
4 Reserved
3 Reserved
2 Reserved
1 Reserved
0 1'b0 RW CTH engine run enable bit. When set to 1, the CTH engine starts data transfer. When cleared to 0, the transfer is stopped. If the engine is busy when cleared, it finishes the current descriptor before stopping.