Transfer Descriptors Sample Clauses

Transfer Descriptors. A Transfer Descriptor (TD) is a system memory data structure that is used by the Host Controller to define a buffer of data that will be moved to or from an endpoint. TDs come in two types: general and isochronous. The General TD is used for Interrupt, Control, and Bulk Endpoints and an Isochronous TD is used to deal with the unique requirements of isochronous transfers. Two TD types are supported because the nature of isochronous transfers does not lend itself to the standard DMA buffer format and the packetizing of the buffer required for isochronous transfers is too restrictive for general transfer types. Both the General TD and the Isochronous TD provide a means of specifying a buffer that is from 0 to 8,192 bytes long. Additionally, the data buffer described in a single TD can span up to two physically disjoint pages. Although the scatter/gather capabilities of a single TD are limited, it eliminates most of the problems associated with forcing buffers to be physically contiguous including the possibility of superfluous data movements. Transfer Descriptors are linked to queues attached to EDs. The ED provides the endpoint address to/from which the TD data is to be transferred. The Host Controller Driver adds to the queue and the Host Controller removes from the queue. When the Host Controller removes a TD from a queue, it links the TD to the Done Queue. When a TD is unlinked from the ED and linked to the Done Queue, it is said to be ‘retired’. A TD may be retired due to normal completion or because of an error condition. When the TD is retired, a condition code value is written in the TD which allows the Host Controller Driver to determine the reason it was retired. Details of TD processing are dependent on the type of TD and are discussed in Sections 4.3.1 through 4.3.3.1.
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Related to Transfer Descriptors

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  • Service Descriptions Available services for Transitional and Enhanced Supervision Services a. One (1) one-to-one meeting with the Contractor per week for case management services.

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  • Job Descriptions The Employer agrees to supply each employee with a copy of her current job description. Upon request, the Union and the Bargaining Unit Chair shall be provided copies of all job descriptions in the bargaining unit.

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  • Job Description The Employer agrees to draw up job descriptions for all positions for which the Union is bargaining agent. These descriptions shall be presented and discussed with the Union and shall become the recognized job descriptions unless the Union presents written objection with thirty (30) calendar days. If such objection cannot be resolved, the issue may be subject to grievance and arbitration.

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