參數(shù)資料
型號(hào): DRM061
英文描述: USB Thumb Drive
中文描述: USB拇指驅(qū)動(dòng)器
文件頁(yè)數(shù): 20/26頁(yè)
文件大?。?/td> 485K
代理商: DRM061
Firmware
USB Thumb Drive Designer Reference Manual, Rev. 0
20
Freescale Semiconductor
Figure 4-8
shows the flow of the SCSI command handling flow. The host sends the Command Block
Wrapper (hereafter referred as CBW) to UF32 via USB2.0 interface. The SCSI command handling
firmware will then respond to the host regarding to the corresponding SCSI command.
4.9 SCSI Command Read Packet
Figure 4-9. SCSI Command Read Packet
Figure 4-9
shows the flow of the SCSI command read packet. The data of the corresponding LBA will be
sent to the host via USB2.0 interface once the UF32 receives a SCSI command (0x28). The firmware gets
the LBA and determines its corresponding segment for update the logical to physical table “LogToPhyTbl”
if necessary. The Physical Block Address (hereafter referred as PBA) can be converted from the
“LogToPhyTbl”. The data can be retrieved from NAND Flash according to this PBA by the UF32 and
sends them to PC host via USB2.0 interface.
Get data from NAND Flash PBA
Send out data to host via IQUE
Finish to read
no. of LBA
Update LogToPhyTbl if necessary
Decode LBA to PBA
Get LBA
RTS
SCSI COMMAND Read (0x28)
N
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