Mass storage – ACS ACR100I SIMFlash II User Manual
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ACR100I Reference Manual
Version 1.00
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7.2. Mass Storage
Mass Storage Device Class specifies all protocols required for data transaction between the Host
(computer) and storage devices. The configurations and usage of USB endpoints on ACR100I shall
follow Mass Storage Class Bulk-Only Transport in Section 3 (Protocol Code) of the USB Mass
Storage Device Specification. This document is available a
An overview of this specification is summarized below:
1. Control Commands are sent on control pipe (default pipe). It is shared with the CCID
interface.
2. Data-Out Command Protocol uses the Bulk-OUT endpoint to transfer data from the host to
the device.
3. Data-In Command Protocol uses the Bulk-IN endpoint to transfer data from the device or to
return status about the device.