CY7C68300
Document #: 38-08011 Rev. *B
Page 4 of 26
1.0
Introduction
The EZ-USB AT2
implements a fixed function bridge between one USB port and one ATA- or ATAPI-based mass storage device
port. This bridge adheres to the Mass Storage Class Bulk-Only Transport Specification and is intended for self-powered devices.
The USB port of the EZ-USB AT2 is connected to a host computer directly or via the downstream port of a USB hub. Host software
issues commands and data to the EZ-USB AT2 and receives status and data from the EZ-USB AT2 using standard USB protocol.
The ATA/ATAPI port of the EZ-USB AT2 is connected to a mass storage device. A 4-Kbyte buffer maximizes ATA/ATAPI data
transfer rates by minimizing losses due to device seek times. The ATA interface supports ATA PIO modes 0, 3, and 4, and Ultra
DMA modes 2 and 4.
The device initialization process is configurable, enabling the EZ-USB AT2 to initialize ATA/ATAPI devices without software
intervention.
1.1
Features
• Complies with USB-IF specifications for USB 2.0, the USB Mass Storage Class, and the USB Mass Storage Class
Bulk-Only Transport Specification
• Operates at high (480-Mbps) or full (12-Mbps) speed
• Complies with T13’s ATA/ATAPI-6 Draft Specification
• Supports 48-bit addressing for large hard drives
• Supports PIO modes 0, 3, 4, and UDMA modes 2, 4
• Uses one external serial EEPROM containing the USB device serial number, vendor and product identification data,
and device configuration data
• ATA interface IRQ signal support
• Support for ATA/ATAPI devices configured either as master or slave
•“ATA-Enable” input signal, which three-states all signals on the ATA interface in order to allow sharing of the bus
with another controller (e.g., an IEEE-1394 to ATA bridge chip)
• Support for board-level manufacturing test via USB interface
• 3.3V operation for self-powered devices
• 56-pin SSOP and 56-pin QFN packages.
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