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It is possible that when a host requests data or sends data that the device will not be able to service the request.

In these situations beagle analyzer usb device will NAK the host. If the data transfer is a Control or Bulk transfer, the host will retry the transaction. However, if it is Isochronous or Interrupt transfer, it will not retry the transaction.


On a full or low-speed bus, if the transaction is repeated, it is repeated in its entirety. This is true regardless of the direction of the data transfer. If the host is requesting information, it will continue to send IN tokens until the device sends beagle analyzer usb.

However, if the host is transmitting data there is the beagle analyzer usb for graver consequences. For example, if the host attempted beagle analyzer usb send 64 bytes of data to a device, but the device responded with a NAKthe host will retry the entire data transaction. This requires sending the entire byte data payload repeatedly until the device responds with an ACK.

This has the potential to waste a significant amount of bandwidth. It is for this reason that high-speed hosts have an additional feature when the device signals the inability to accept any more data.

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When a high-speed host receives a NAK after transmitting data, instead of retransmitting the entire transaction, it simply sends a 3-byte PING token to poll the device and endpoint in question. The host will continue to PING the device until it responds with an ACKwhich indicates to the host that it is ready to receive information. At that beagle analyzer usb, the host will transmit a packet in its entirety. Hubs make it possible to expand the number of possible devices that beagle analyzer usb be attached to a single host.

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There are two beagle analyzer usb of hubs that are commercially available for wired USB: full-speed hubs and high-speed hubs. Both types of hubs have mechanisms for dealing with downstream devices that are not of their speed.

This means that all high-speed devices that are plugged into a full-speed hub are automatically downgraded to full-speed data rates. On the other hand, low-speed devices are not beagle analyzer usb to full-speed data rates. In order to send beagle analyzer usb to low-speed devices, the hub must actually pass slower moving data signals to those devices. The host or high-speed hub is the one that generates these slower moving signals on the full-speed bus.

beagle analyzer usb Ordinarily the low-speed ports on the hub are quiet. This opens up the low-speed ports. Note that the PRE is sent at full-speed data rates, but the following transaction is transmitted at low-speed data rates.


They do not downgrade the link between the host and hub to slower speeds. However, high-speed hubs must still deal with slower devices being downstream of them. High-speed hubs do not use the same mechanism as full-speed hubs. There would be a tremendous cost on bandwidth to other high-speed devices on the bus if low-speed or full-speed signaling rates were used between the host and the hub of interest. The SPLIT token is similar to the PRE in that it indicates to a hub that the following transaction is for a slower speed beagle analyzer usb, however the data following the SPLIT is transmitted to the hub at high-speed data rates and does not choke the high-speed bus.

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SSPLIT s are only used the first time that the host wishes to beagle analyzer usb a given transaction to the device. The hub may respond many times with NYET before supplying the host with the devices response.

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Figure 16 illustrates an example of hub transaction. Start-of-Frame SOF transactions are issued by the host at precisely timed intervals. These tokens do not cause any device to respond, and can be used by devices for timing reasons.The Beagle beagle analyzer usb of USB Protocol Analyzers is the only solution available to view all USB2, USB3 and Power Delivery traffic in real time. Beagle USB 12 Protocol Analyzer is a non-intrusive full and low speed USB protocol analyzer that includes real-time USB descriptor parsing.


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