QDMA context programming register access changed
to a new AXI4-Lite slave CSR interface in QDMA
4.0.
Following is the QDMA AXI4-Lite slave CSR register space table:
| Register Space | AXI4-Lite Slave CSR Interface | Details | NVMe TC |
|---|---|---|---|
| DMA Registers | AXI4-Lite Slave CSR Address bit [15] is set to 1. | Through this interface, only the DMA CSR register space can be accessed. | This is new interface directly connected to the processor for DMA CSR register access from firmware. |
Following is the QDMA AXI4-Lite slave register space table:
| Register Space | AXI4-Lite Slave Interface | Details | NVMe TC |
|---|---|---|---|
| DMA Queue Registers | AXI4-Lite Slave Address bit [29:28] is set to 2’b11. | Through this interface, only the DMA Queue register space can be accessed. |
This is existing interface directly connected to NVMe TC for DMA Queue register access. Any existing context programming register access through this address space must be removed. |
Following is the S_AXI_LITE and S_AXI_LITE_CSR connectivity block diagram:
Figure 1. S_AXI_LITE and S_AXI_LITE_CSR
Following is the QDMA registers table:
| Register Space | Interface/Address Window | Hardware Access (Intrenal to NVMETC IP) | Software Access |
|---|---|---|---|
| QDMA_DMAP_SEL_INT_CIDX[2048] (0x18000) |
Nvmetc QDMA_M_AXI_LITE 0x2_0000 – 0x2_FFFF |
Yes |
Yes during qdma initialization |
| QDMA_DMAP_SEL_H2C_DSC_PIDX[2048] (0x18004) |
Nvmetc QDMA_M_AXI_LITE 0x2_0000 – 0x2_FFFF |
Yes | No |
| QDMA_DMAP_SEL_C2H_DSC_PIDX[2048] (0x18008) |
Nvmetc QDMA_M_AXI_LITE 0x2_0000 – 0x2_FFFF |
Yes | No |
| QDMA_DMAP_SEL_CMPT_CIDX[2048] (0x1800C) |
Nvmetc QDMA_M_AXI_LITE 0x2_0000 – 0x2_FFFF |
Yes |
Yes during qdma initialization |
| QDMA_REG_IND_CTXT_DATA (0x804) | CSR AXI4-Lite | No | Yes |
| QDMA_REG_IND_CTXT_MASK (0x824) | CSR AXI4-Lite | No | Yes |
| QDMA_REG_IND_CTXT_CMD (0x844) | CSR AXI4-Lite | No | Yes |
| QDMA_REG_TRQ_SEL_FMAP (0x400) | CSR AXI4-Lite | No | Yes |
| MDMA_C2H_PFCH_BYP_QID (0x1408) | CSR AXI4-Lite | No | Yes |
| MDMA_C2H_PFCH_BYP_TAG (0x140c) | CSR AXI4-Lite | No | Yes |
| For complete list of CSR registers, see register reference file (registration required). | CSR AXI4-Lite | No | Yes |