The main clock for the processor is derived from a 24MHz crystal. Views Read View source View history. The components are placed in a specific manner to accommodate future components and facilitate easy routing. Other applications might have their own map. Port0 Statistics Map provided above. The sample code for Handle allocation and initialization from the example application is shown below.
When the feature is enabled, every time a multicast or broadcast packet is received a counter referred to as storm prevention credits is decremented and the packet is sent to the host as well as cut through. If a callback is not registered then the queue is just emptied to prevent queues from overflowing. This website uses cookies to improve your experience while you navigate through the website.
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But opting out of some of these cookies may have an effect on your browsing experience. Necessary cookies are absolutely essential for the website to function properly. This category only includes cookies that ensures basic functionalities and security features of the website. These cookies do not store any personal information. L3 map is not of much use to the developer while DDR map is dynamic and is part of the application.
When a packet is received in firmware, the 3 bit PCP field of the VLAN tag is read and the packet is copied to the appropriate queue based on fixed mapping which maps 2 levels out of 8 of QoS to one queue.
For example the line above where PRU user interrupt 0 maps to Host grm 2 can be modified to. The Pin assignment is as given below. This article builds upon the foundation outlined amxx it. Another important difference which is obvious from the name is that an EMAC does not forward a packet from one port amz another like a Switch. The entire reset supervisor circuit can be seen in Figure 3.
For in depth information on how to re-build the icss-emac LLD PDK component in case your use case requires re-sizing the Queue sizes, refer to [1]. A supervisor circuit with manual reset input has two specific functions. By communicating over the I2C bus, these outputs can be set to arbitrary values. It is internally configured as a16 Meg x 16 x 8 bank memory.
The advantage of such an approach is that both interrupts are serviced even if they are raised at the same time. NOTE The code snippets in this guide are only informative, they may or may not compile if taken as it is. It expects the application to do following MDIO operations. The board contains a serial EEPROM with the board specific data which allows the processor to automatically detect which board is connected and the version of that board.
To overcome this problem, a reset supervisor circuit can be used. This avoids duplication of traffic on both ports. They are enabled by default and provide provide port specific statistics. This is called by default inside the driver.
It also supports an SD card socket. All the resources on the board surround the AM processor to provide development capabilities for hardware and software. A power supply is not included with the kit.
This article builds upon the foundation outlined in it. The PRU firmware then sets cyclic triggers repeatedly and shall send amx packets cyclically provided that they are queued before the trigger. Current SDK release 2. The convention used here is two physical ports and one host port. While transmitting a packet when provided with the destination MAC address the module returns the port number on which the device resides.
As of now the multicast and broadcast storm prevention functionalities are clubbed together but it is proposed to have them separate in the future. This corresponds to a boot sequence of:. I2C address of the codec is configured as The time period of this tick function default ms in combination with credits value decides the rate at which Storm Prevention works.
Anything lower than this configured value goes to the callback function. On the other hand, packets from other queues are acyclic packets. So in total there are 15 queues 12 queues in EMAC4 receive queues for Host and 4 transmit queues for each of the two physical ports. Since all the Industrial protocols and Ethernet MAC share the same basic software architecture a discussion of Ethernet MAC goes a long way in understanding the implementation of other protocols.
The advantage of such an approach is that both interrupts are serviced even if they are raised at the same time. This article is a part of the broader OSDx Reference Design Lesson 1 series which consists of a sequence of articles designed to help you build the bare minimum circuitry required to boot the OSDx.
SPI0 Expansion header pinout is provided below. The Pin use description file provides us the information on the pin functionality mode selected.
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