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Chip from Cypress allows USB 2.0 mass storage

Posted: 05 Jun 2002 ?? ?Print Version ?Bookmark and Share

Keywords:ez usb at2? cy7c68300? storage bridge chip? bridge ic? usb 2.0?

A fourth-generation mass-storage bridge chip from Cypress Semiconductor Corp., the EZ-USB AT2 (CY7C68300), offers USB 2.0 to ATA/ATAPI support to connect PCs and other information appliances to external storage units, such as HDDs, CD, and DVD drives.

Jeff Chang, product-marketing manager for Cypress' Personal Communications Division, described the part as a fixed-function USB 2.0-to-ATA/ATAPI bridge device that includes support for ATA-6, which enables a class of large-capacity HDDs. It also has ATA interrupt request support to ensure compatibility with a range of devices.

Besides standard programmed I/O/ultradirect memory access modes, the device supports master or slave mode as well as tristate control for combination USB 2.0-1394 (FireWire) devices.

The chip can transfer data packets at 480Mbps (the fastest rate allowed by the USB 2.0 specification), or at a burst data rate of 53MBps. It's available in 56 SSOP and 56 QFN packages and is priced from $4.50 in quantities of 100,000 for the SSOP.

A reference design kit available for $199 includes an evaluation board, hardware, software, a Windows driver, DOS and manufacturing support.

EE Times

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