ALTERA CHAINING DMA DRIVER
These target memory transactions bypass the DMA engines. RX Buffer credit allocation -performance for received requests. Capabilities Registers Parameter Possible Values Default Value Description Maximum payload size bytes bytes bytes bytes Specifies the maximum payload size supported. If set to 0, this component is not permitted to use MSI. Altera performs the following tests in the simulation environment: To iteratively retrieve four-dword descriptors to start a DMA To send update status to the RP, for example to record the number of descriptors completed to the descriptor header Each subsequent descriptor consists of a minimum of four dwords of data and corresponds to one DMA transfer.
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Updated steps for Software Installation. Changed the directory name in the “Running the Software Application” section.
It sets the read-only value of the Endpoint L1 acceptable latency field of the Device Capabilities Register. Available in Root Port mode.
Arria V Avalon-ST Interface for PCIe Solutions User Guide
The 6 bits of this vector correspond to the following 6 types of credit types:. The counter starts when the software writes a descriptor header table to the DMA registers. Reserved The following encodings are defined for Root Ports: Type 0 Configuration Space Header. Double-click any IP core name to launch the parameter editor and generate files representing your IP variation.
To iteratively retrieve four-dword descriptors to start a DMA To send update status to the RP, for example to record the number of descriptors completed to the descriptor header Each subsequent descriptor consists of a minimum of four dwords of data and corresponds to one DMA transfer. Click the browse button. The following timing diagram eliminates the delay for completions with the exception of the first read.
The following table shows the layout of the control fields of the chaining DMA descriptor. After the transfer is complete, the software application uses the counter value to compute the throughput for the transfer and reports it. PCI Express Gen2 5. When an error occurs, the appropriate signal is asserted for one cycle.
A word is 16 bits, a dword is 32 bits, and a qword is 64 bits. The Application Layer must assert this signal when a master block is waiting for completion, for example, when a transaction is pending.
This field indicates permitted values for MSI signals. Power management turn off status register.
The error condition is read from the Root Port. Transfer length —Specifies the transfer dna in bytes Sequence —Controls the sequence for data transfer or addressing Number of iterations —Controls the number of iterations for the data transfer Board —Specifies the development board for the software application Continuous loop —When this option is turned on, the application performs the transfer continuously.
Refer to Section 7. Hi John, thanks for this nice article.
CONFIG_ALTERA_PCIE_CHDMA: Altera PCI Express Chaining DMA driver
Final support —the IP core is verified with final timing models for this device family. They can show what is happening on the address and data bus between the processor and the peripheral. A TLPs is not transmitted unless the receiver has enough free buffer space to accept it.
Secondary Bus number to Subordinate Bus number window Bit 5: In systems that use the hard reset controller, this signal is edgenot level sensitive; consequently, you cannot use a low value on this signal to hold custom logic in reset.
Leave A Comment Cancel reply Comment. The problem occurs when a DMA transfer changes the contents of main memory that has been cached by the processor. There are multiple BARs that map to each of these blocks to maximize interoperability with different variation files.
Software refers to memory using virtual addresses both in the atlera and application address spaces.
If no other delays are added to the ready-valid latency, the resulting delay corresponds to a readyLatency of 2. Doing so, may leave an MSI request from one function in the pending state, blocking the MSI requests of other functions.
Debug signals are not rigorously verified and should only be used to observe behavior.