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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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UM0290 датащи(PDF) 41 Page - STMicroelectronics |
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UM0290 датащи(HTML) 41 Page - STMicroelectronics |
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41 / 76 page  UM0290 Mass storage demo 41/76 ● dCSWSignature: 53425355 USBS (little Endian). ● dCSWTag: the device must set this field with the received value of dCBWTag in the related CBW. ● dCSWDataResidue: the difference between the expected data (the value of dCBWDataTransferLength field of the related CBW) and the real value of data received or sent by the device. ● bCSWStatus: the status of the related command. This field can take any of the three values shown below in Table 13: Data transfer The data transfer phase is specified by the dCBWDataTransferLength and bmCBWFlags of the correspondent CBW. The host must attempt to transfer the exact number of bytes to or from the device. The diagram of the Figure 10 shows the state machine of a BOT transfer. Note: For more information about the BOT protocol please refer to the specification “Universal Serial Bus Mass Storage class Bulk-only transport”. Table 12. CSW packet fields 76 543 210 0-3 dCSWSignature 4-7 dCSWTag 8-11 dCSWDataResidue 12 bCSWStatus Table 13. Command block status values Value Description 00h Command Passed 01h Command Failed 02h Phase Error 03h=>FFh Reserved |
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