UM0290 datasheet(41/76 Pages) STMICROELECTRONICS

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UM0290

Mass storage demo

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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

543

210

0-3

dCSWSignature

4-7

dCSWTag

8-11

dCSWDataResidue

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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