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ehci_link_t | next |
| | Word 0: Queue Head Horizontal Link Pointer.
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| uint32_t | device_address: 7 |
| | Word 1 : Endpoint Characteristics. More...
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uint32_t | non_hs_period_inactive_next_xact: 1 |
| | This bit is used by system software to request that the host controller set the Active bit to zero. See Section 4.12.2.5 for full operational details.
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uint32_t | endpoint_number: 4 |
| | This 4-bit field selects the particular endpoint number on the device serving as the data source or sink.
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uint32_t | endpoint_speed: 2 |
| | This is the speed of the associated endpoint 00b=Full 01b=Low 10b=High 11b=Reserved.
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uint32_t | data_toggle_control: 1 |
| | This bit specifies where the host controller should get the initial data toggle on an overlay transition. 0b=Ignore DT bit of qTD, 1b=Use DT bit of qTD.
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uint32_t | head_list_flag: 1 |
| | This bit is set by System Software to mark a queue head as being the head of the reclamation list. See Section 4.8 for operational model.
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uint32_t | max_package_size: 11 |
| | This directly corresponds to the maximum packet size of the associated endpoint (wMaxPacketSize)
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uint32_t | non_hs_control_endpoint: 1 |
| | If the QH.EPSfield indicates the endpoint is not a high-speed device, and the endpoint is an control endpoint, then software must set this bit to a one. Otherwise it should always set this bit to a zero.
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uint32_t | nak_count_reload: 4 |
| | This field contains a value, which is used by the host controller to reload the Nak Counter field.
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uint32_t | __pad0__: 0 |
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| uint32_t | interrupt_smask: 8 |
| | Word 2 : Endpoint Capabilities. More...
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uint32_t | non_hs_interrupt_cmask: 8 |
| | This field is ignored by the host controller unless the EPSfield indicates this device is a low- or full-speed device and this queue head is in the periodic list. This field (along with the Activeand SplitX-statefields) is used to determine during which micro-frames the host controller should execute a complete-split transaction.
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uint32_t | hub_address: 7 |
| | This field is ignored by the host controller unless the EPSfield indicates a full- or low-speed device. The value is the USB device address of the USB 2.0 Hub below which the full- or low-speed device associated with this endpoint is attached. This field is used in the split-transaction protocol. See Section 4.12.
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uint32_t | hub_port: 7 |
| | This field is ignored by the host controller unless the EPSfield indicates a full- or low-speed device. The value is the port number identifier on the USB 2.0 Hub (for hub at device address Hub Addrbelow), below which the full- or low-speed device associated with this endpoint is attached. This information is used in the split-transaction protocol. See Section 4.12.
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uint32_t | mult: 2 |
| | This field is a multiplier used to key the host controller as the number of successive packets the host controller may submit to the endpoint in the current execution. 00b=Reserved 01b,10b,11b= 1 (2, 3) Transaction for this endpoint/micro frame.
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uint32_t | __pad1__: 0 |
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volatile uint32_t | qtd_addr |
| | Word 3: Current qTD Pointer.
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volatile ehci_qtd_t | qtd_overlay |
| | Word 4-11: Transfer Overlay.
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| uint8_t | used |
| | thus there are 16 bytes padding free that we can make use of. More...
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uint8_t | is_removing |
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uint8_t | pid_non_control |
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uint8_t | class_code |
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uint16_t | total_xferred_bytes |
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uint8_t | interval_ms |
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uint8_t | reserved |
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ehci_qtd_t *volatile | p_qtd_list_head |
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ehci_qtd_t *volatile | p_qtd_list_tail |
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Queue Head (section 3.6)
Definition at line 156 of file ehci.h.
1.8.6 
