AMx ARM® Cortex™-A8 Microprocessors. (MPUs). Technical Reference Manual. Literature Number: SPRUH73C. October –Revised. AMx ARM® Cortex™-A8 Microprocessors. (MPUs). Technical Reference Manual. Literature Number: SPRUH73J. October –Revised December . Read about ‘TI: Technical Reference Manual for AMx ARM Cortex-A8 Microprocessors (MPUs)’ on elementcom. TI: Technical Reference.
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To overcome this problem, a reset supervisor circuit can be used.
AMxStarterKitHardwareUsersGuide – Texas Instruments Wiki
Navigation menu Personal tools Log in Request account. 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. There are two expansion connectors provided in the ICE board. Modify the ethPrioQueue value as per requirement. Based on the rtm of the packet which is decided by the queue number refer to discussion on QoS and queues driver decides to either forward it to NDK, done by icssEmacHwIntRx or give it to the callback function.
This switch selects a 4bit hex value and a I2C converter allows this encoded value to be read by the AMx through the I2C0 port. 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. Port0 Statistics Map provided above. Rtm get the values correctly the memory layout on both sides should be identical.
OSD335x Reset Circuitry
The built-in debouncing time defines a minimum button press duration that is required for button press detection. Developer needs to know that firmware copies the packet data here after receiving them and this is where the driver writes the packet data meant for transmission using the firmware.
This corresponds to a boot sequence of:. This signal is applied until the power supplies are stable and the device can begin normal operation. NOTE The code snippets in this guide are only informative, they may or may not compile if taken as it is.
Collisions are handled using ageing counters, one ageing counter is associated with each of the 4 entries inside a bucket. Similar to enablement, variable set to False. In general, a reset signal is asserted during device startup to make sure the device begins operation from a known initial state each time it is powered up. Other hardware specific data can be stored in this memory as well. Pages with broken file links. It expects the application to do following MDIO operations.
It’s not on the SoC and hence has a lower performance. Please refer to it for more details.
This page has been accessed 51, times. This configuration time is used to setup the start trigger and end trigger of current cycle in the PRU firmware. Ttm example the line above where PRU user interrupt 0 maps to Host channel 2 can be modified to. The sample code for Handle allocation and initialization from the example application is shown below. The components are placed in a specific manner to accommodate future components and facilitate easy routing. This is done in the following line defined in main.
Hrm Storm prevention implementation is similar in both PRU’s but implemented separately, so it’s possible to turn it off selectively for each port. These modes are not exclusive to each other and multiple modes are also allowed.
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. A detailed description is given below. Most often Storm Prevention is the main reason for users not being able to receive a packet, esp if the rate is configured incorrectly. All packets in queue 0 are cyclic packets. Views Read View source View history. Storm prevention is implemented on the two PRU’s as a credit based scheme. It is not intended for use in end products.
The TRM’s can be found here. The corresponding API for this is. The LLD expects single interrupt for both Ports. Here taskPruss is given the job of initializing the PRU’s and loading the firmware onto them.