TX Copy DMA status register.
DMA_TX_I_ILG_ST | Record the illegitimate information of TX Copy DMA. [22:6]: store the bits [18:2] of address. [5]: if bits [31:19] of address are 0x7ff, then the bit value is 1, otherwise it is 0. [4]: 1 means write operation, 0 means read operation. [3:0]: TX Copy DMA bus byte enables. |