Are your flags active high or active low?
The DMA_RDY flag for a rx socket should be interpreted as a Full Flag.
The DMA_RDY flag for a tx socket should be interpreted as a Empty Flag.
The flags are set as active high.
From the GPIFII help it states :-
This trigger is true when the DMA is ready to send or receive data.
So I have ,DMA_RDY_TH0 on a recieve port and ,DMA_RDY_TH3 on a transmit port.
So you are saying that the TH0 will be high when the DMA buffer is full and the TH3 will be high when the DMA buffer is empty?
Yes, that is correct.
The terminology here (dma_rdy) is not perfectly right.
The outputs you will observe will adhere to the !(dma_rdy) logic.
They are essentially full/empty flags.