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UM0290

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5.3

Mass storage demo implementations

The STR7/9 USB IP presents two modes for the bulk transfer: simple and double buffer

modes. So describe these two modes this demo provides two different implementations,

one for each mode. The major difference between the two implementations is the data

transfer management.

This chapter presents the two implementations supported by the demo.

5.3.1

Hardware configuration interface

The hardware configuration interface is a layer between the USB application (in our case the

Mass Storage demo) and the internal/external hardware of the STR microcontroller. This

internal and external hardware is managed by the STR Standard Software Library, so from a

firmware point of view, the hardware configuration interface is the firmware layer between

the USB application and the standard library. Figure 11 shows the interaction between the

different firmware components and the hardware environment.

Start Stop Unit

0x1B

Enable or disable the Logical Unit for

media access operations and controls

certain power conditions

RBC

Test Unit Ready

0x00

Request the device to report if it is ready

SPC-2

Verify (10)

0x2F

Verify data on the media

RBC

Write (10)

0x2A

Transfer binary data from the host to the

media

RBC

Command Support key: M = support is mandatory, O = support is optional

This table doesn’t show all the SCSI commands. For more information please refer to the SPC and RBC

specifications.

Table 14.

SCSI Command Set(1) (continued)

Command Name

OpCode

Command

Support

Description

Reference

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