The PCIe DMA tab is shown in the following figure.
Figure 1. PCIe DMA Tab
- Number of DMA Read Channels
- Available selection is from 1 to 4.
- Number of DMA Write Channels
- Available selection is from 1 to 4.
- Number of Request IDs for Read channel
- Select the max number of outstanding request per channel. Available selection is from 2 to 64.
- Number of Request IDs for Write channel
- Select max number of outstanding request per channel. Available selection is from 2 to 32.
- Descriptor Bypass for Read (H2C)
- Available for all selected read channels. Each binary digits corresponds to a channel. LSB corresponds to Channel 0. Value of one in bit position means corresponding channels has Descriptor bypass enabled.
- Descriptor Bypass for Write (C2H)
- Available for all selected write channels. Each binary digits corresponds to a channel. LSB corresponds to Channel 0. Value of one in bit position means corresponding channels has Descriptor bypass enabled.
- AXI ID Width
- The default is 4-bit wide. You can also select 2 bits.
- DMA Status port
- DMA status ports are available for all channels.