|dsc_crdt_in_vld||I||Valid. When asserted the user must be presenting valid data on the bus and maintain the bus values until both valid and ready are asserted on the same cycle.|
|dsc_crdt_in_rdy||O||Ready. Assertion of this signal indicates the DMA is ready to accept data from this bus.|
|dsc_crdt_in_dir||I||Indicates whether credits are for H2C or C2H descriptor ring.
If the fence bit is set, the credits are not coalesced, and the queue is guaranteed to generate a descriptor fetch before subsequent credit updates are processed. The fence bit should only be set for a queue that is enabled, and has both descriptors and credits available, otherwise a hang condition might occur.
|dsc_crdt_in_qid [10:0]||I||The QID associated with the descriptor ring for the credits are being added.|
|dsc_crdt_in_crdt [15:0]||I||The number of descriptor credits that the user application is giving to QDMA Subsystem for PCIe to fetch descriptors from the host.|