Sequence Bits Sample Clauses

Sequence Bits. The USB protocol uses data PID sequencing to ensure that data packets are received in the correct order. The sequencing requires that the data transmitter continue to send the same data packet with the same data PID (either DATA0 or DATA1) until it has determined that the data packet has been successfully received and accepted. Reception and acceptance are indicated when the transmitter receives an ACK handshake after sending a data packet. In order to ensure that data packets are not lost, the Host Controller and the endpoint must start and stay in data toggle synchronization. Data toggle synchronization is first established at endpoint initialization with the nominal value for the first packet to/from an endpoint using DATA0. On each successive successful packet transmission/reception, the data toggle changes. The data toggle is maintained within a General TD simply by alternating the LSb of the dataToggle field. When the data toggle value must be carried between two General TDs, the toggleCarry bit in the ED is used to propagate the correct value to the next General TD. When the MSb of the dataToggle field is 0, that means that the value of the data toggle is obtained from the toggleCarry bit in the ED and the LSb of the dataToggle field is ignored. When the MSb of the dataToggle field is 1, then the LSb of the dataToggle field contains the value that is to be used for the data toggle. For bulk and interrupt endpoints, most General TDs are queued with dataToggle = 00b. This allows the data toggle to be carried across multiple TDs with the ED containing the value to be used for the first data packet in each transfer. After the first data packet is successfully transferred, the MSb of dataToggle is set to indicate that, for the remainder of the transfer, the dataToggle field will determine the data toggle and the LSb will be set to indicate the next toggle value. When the General TD is retired and HeadP in the ED is updated, the toggleCarry bit in the ED is written to indicate the data toggle value that will be used on the next packet for the endpoint. For control endpoints, the convention is that the Setup packet will always use a data PID of DATA0, the first data packet will use a data PID of DATA1, and the Status packet will use a data PID of DATA1. Since this sequence does not rely on any previous data toggle history, the Setup, data, and status packets should be queued with the MSb of the dataToggle field = 1 and the LSb of each TD set appropriately ...
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