This chapter describes the PCIe® platform, in which a media file is transferred from a x86 host machine (root complex) to the VMK180 evaluation board (endpoint) through the PCIe Queue DMA (QDMA).
The design uses the CPM PCI Express (PCIe) Endpoint Hard block in an Gen3 x8 configuration along with QDMA for data transfers between the host system memory and the endpoint.
The QDMA provides protocol conversion between PCIe transaction layer packets (TLPs) and AXI transactions. The DMA cores are used for data transfer between the programmable logic (PL) to the host, and from the host to the PL.
The DMA can transfer data between host and the memory controller (DDR) and from the DDR to the host. The CPM has an AXI Bridge core for AXI-to-host communication. The downstream AXI4-Lite slaves include user-space registers, which are responsible for a hand-shaking mechanism between the host and the endpoint.
The following figure shows a high-level block diagram of the system.
