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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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RM0319 датащи(PDF) 133 Page - STMicroelectronics |
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RM0319 датащи(HTML) 133 Page - STMicroelectronics |
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133 / 368 page  RM0319 USB 2.0 Device ports (UDC) Doc ID 022640 Rev 3 133/368 OUT data memory structure All endpoints that support out direction transactions (that is, endpoints receiving data from the USB Host) must implement a memory structure according to the following characteristics: ● Each data buffer must have an associated descriptor which provides the status of the buffer. Indeed, the buffer itself contains only raw data. ● Each buffer descriptor is 4-quadlet length. The out data memory structure is given in Figure 42. Table 38 reports the bits assignments for out buffer status quadlet. If the buffer status of the first descriptor is set to host ready (see BS field in Table 38), the DMA fetches and processes its data buffer. Otherwise, the DMA skips to the next descriptor until it reaches the end of the descriptor chain. Figure 42. Out data memory Data Descriptor Pointer OUT Buffer Status Quadlet Reserved Buffer Pointer Next Descriptor Pointer Status Quadlet for Non Iso-chronous OUT R RxBytes BS Rx Sts 15:0 26:16 29:28 31:30 0 31 L 27 Status Quadlet for Iso-chronous OUT Frame Number RxBytes BS Rx Sts 13:0 26:16 29:28 31:30 L 27 PID 15:14 |
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