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CvP configures the FPGA periphery image which includes I/O and hard IP blocks, including the PCIe IP. CvP uses quad SPI memory in AS x4 mode to configure the FPGA fabric. Because the PCIe IP is in the periphery image, PCIe link training establishes the PCIe link of the CvP PCIe IP before the core fabric configures. The host device uses the CvP ...
The PCIe link will come up as gen 1 and detect the number of available lanes. Then the operating system can look at what the devices are capable of and request a speed change by writing to a control register. The actual retraining is mediated by hardware. The autonegotiation process will attempt to get to the highest supported speed and the ...
the PCIe PHY performs byte and word alignment during link training, and is responsible for splitting data across lanes later. This requires knowledge of the PCIe protocol, such as the training sequences, so it cannot be part of the protocol independent layer below. the PCIe MAC handles packet generation and processing.
I'm reading through the PCIe block description and on page 199 it says: Section 6.6 of PCI Express Base Specification, rev 1.1 states “A system must guarantee that all components intended to be software visible at boot time are ready to receive Configuration Requests within 100 ms of the end of Fundamental Reset at the Root Complex.”
Debugging with SignalTap shows that the LTSSM (Link Training and Status State Machine) gets stuck on state 3, which is the "polling compliance" state where "all voltage, noise emission and timing specifications are within tolerance". Altera has a support page but it is not relevant to the Cyclone IV. Some chaps using TI hardware also had a ...
In PCIe base specification document, it is mentioned that. Disabling scrambling is intended to help simplify test and debug equipment... I am implementing my own custom gen2 PCIe IP in Verilog and I would very much like to skip the scrambling/descrambling for now and may be permanentely to reduce the resources of PCIe IP and also the build time.
Modified 7 years ago. Viewed 1k times. 2. In some Intel chipsets the CPU is connected to the Platform Controller Hub (PCH) by a link called Direct Media Interface (DMI). Based on what I found when researching about it, It's a link very similar to PCIe but not from a hardware perspective. However, logically it is considered and configured as such.
Regardless, PCIe link speed is something that is negotiated and trained long after a link is detected as connected. The RC time constant is not used to determine the generation of PCIe card, and any time constant greater than 7.6µs (probably less, it depends on the host controller) will result in the link connection being detected.
Sorted by: 1. The link starts with a training phase with a fixed pattern that the PLL can lock on to. That is part of the link protocol, the higher layers aren't involved. Share. Cite. answered Nov 8, 2020 at 9:41. Simon Richter. 12.8k 1 25 52.
A switch routes and buffers the packets so that both devices can be active at the same time. A mux/demux allows only one device to be active at the same time. The other device is disconnected, as if it were unplugged. (Please note that not all PCIe hosts or devices support hotplugging.) Share.