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3.15 HC Frame Remaining Register (HCFMREMAINING)
The HC frame remaining register (HCFMREMAINING) reports the number of
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| Figure 16. HC Frame Remaining Register (HCFMREMAINING) | |
31 | 30 |
| 16 |
FRT |
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| Reserved |
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15 | 14 | 13 | 0 |
Reserved |
| FR | |
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LEGEND: R = Read only; | |||
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| Table 16. HC Frame Remaining Register (HCFMREMAINING) Field Descriptions | |
Bit | Field | Value | Description |
31 | FRT | Frame remaining toggle. This bit is loaded with the frame interval toggle bit every time the USB | |
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| host controller loads the frame interval field into the frame remaining field. |
Reserved | 0 | Reserved | |
FR | Frame remaining. The number of | ||
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| automatically reloaded with the frame interval (FI) value in the HC frame interval register |
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| (HCFMINTERVAL) at the beginning of every frame. |
3.16 HC Frame Number Register (HCFMNUMBER)
The HC frame number register (HCFMNUMBER) reports the current USB frame number. HCFMNUMBER is shown in Figure 17 and described in Table 17.
| Figure 17. HC Frame Number Register (HCFMNUMBER) |
31 | 16 |
| Reserved |
| |
15 | 0 |
| FN |
|
LEGEND: R = Read only;
Table 17. HC Frame Number Register (HCFMNUMBER) Field Descriptions
Bit | Field | Value | Description |
Reserved | 0 | Reserved | |
| FN |
| Frame number. This field reports the current USB frame number. It is incremented when the frame |
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| remaining field is reloaded with the frame interval (FI) value in the HC frame interval register |
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| (HCFMINTERVAL). Frame number automatically rolls over from FFFFh to 0. After frame number is |
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| incremented, its new value is written to the HCCA and the USB host controller sets the SOF |
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| interrupt status bit and begins processing the ED lists. |
24 | Universal Serial Bus OHCI Host Controller |
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