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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) 134 Page - STMicroelectronics |
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RM0319 датащи(HTML) 134 Page - STMicroelectronics |
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134 / 368 page  USB 2.0 Device ports (UDC) RM0319 134/368 Doc ID 022640 Rev 3 Table 38. Out data memory: buffer status quadlet bit assignments (for Non- Isochronous OUT) Bit Name Description [31:30] BS Buffer status. This 2 bit field reports the status of the out buffer, according to encoding: – 2'b00 Host ready. = The descriptor is available to be processed by DMA. – 2'b01 DMA busy. = The DMA is still processing the descriptor. – 2'b10 DMA done. = Buffer data transfer completed by DMA. – 2'b11 Host busy. = The application is processing the descriptor. [29:28] Rx Sts Receive status. This 2 bit field reports the status of the received out data (according to encoding), reflecting whether the out data has been correctly received or some errors occurred: – 2'b00 = Success. – 2'b01 = DESERR (descriptor transfer error). – 2'b10 = Reserved. – 2'b11 = BUFFER (data transfer error). Note: In particular, a DESERR receive status indicates that the out buffer status is something other than Host ready (that is, BS not equal to 2’b00) during descriptor fetch. [27] L If set, it indicates that this descriptor is the last one of the chain. [26:16] Reserved (Non ISO) Read: undefined. Write: should be zero. [15:00] Rx Bytes (Non ISO) Received number of bytes. Its 16 bit width allows values ranging from 0 to 64 kbytes, depending on the packet size of data received from the USB Host. |
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