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Overview
10-1-2 ENDPOINTS
On the device side, in compliance with the BOT specification, the MSC is composed of the
following endpoints:
■
A pair of control IN and OUT endpoints called default endpoint.
10
■
A pair of bulk IN and OUT endpoints.
Table 10-1indicates the different usages of the endpoints.
Endpoint
Control IN
Control OUT
Bulk IN
Bulk OUT
Direction
Device to Host
Host to Device
Device to Host
Host to Device
Usage
Enumeration and MSC class-specific requests
Send CSW and data
Receive CBW and data
Table 10-1 MSC Endpoint Usage
10-1-3 MASS STORAGE CLASS REQUESTS
There are two defined control requests for the MSC BOT protocol. These requests and their
descriptions are detailed in Table 10-2.
Class Requests
Bulk-Only Mass Storage Reset
Get Max LUN
Description
This request is used to reset the mass storage device and its associated
interface. This request readies the device to receive the next command block.
This request is used to return the highest logical unit number (LUN) supported
by the device. For example, a device with LUN 0 and LUN 1 will return a value
of 1. A device with a single logical unit will return 0 or stall the request. The
maximum value that can be returned is 15.
Table 10-2 Mass Storage Class Requests
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