The descriptor fetch engine can be bypassed on a per channel basis through
Vivado®
IDE parameters. A channel with descriptor bypass enabled accepts
descriptor from its respective c2h_dsc_byp or
h2c_dsc_byp bus. Before the channel accepts descriptors, the Control
register Run bit must be set. The NextDescriptorAddress and NextAdjacentCount, and Magic
descriptor fields are not used when descriptors are bypassed. The
ie_descriptor_stopped bit in Control register bit does not prevent
the user logic from writing additional descriptors. All descriptors written to the
channel are processed, barring writing of new descriptors when the channel buffer is
full.