This document describes the features and characteristics of the EZ-USB AT2LP™ USB 2.0 to ATA/ATAPI Bridge products from Cypress Semiconductor Corporation, including fixed-function mass storage device, compliance with USB 2.0 and USB Mass Storage Class standards, support for ATA/ATAPI-6 specification, support for 48-bit addressing, etc.
The EZ-USB AT2LP bridge implements a fixed‑function USB 2.0 to ATA/ATAPI interface for mass‑storage devices. It supports high‑speed (480 Mbps) and full‑speed (12 Mbps) USB operation, two power modes (self‑powered or bus‑powered), and a range of ATA commands, security features, and BIOS boot support.
The document provides block diagrams, detailed pin descriptions for 56‑pin SSOP, 56‑pin QFN and 100‑pin TQFP packages, electrical characteristics such as supply voltage and current limits, package diagrams, and PCB layout recommendations for reliable high‑performance designs.
| Supply Voltage (VCC) | 3.15 V – 3.45 V (typ 3.3 V) |
|---|---|
| USB High‑Speed Current | 50 mA – 85 mA |
| USB Full‑Speed Current | 35 mA – 65 mA |
| Suspend Current (connected) | 0.5 mA – 1.2 mA (CY7C68300B/CY7C68320) |
| Package Types | 56‑pin SSOP, 56‑pin QFN, 100‑pin TQFP |
It operates at high‑speed (480 Mbps) or full‑speed (12 Mbps) USB.
The bridge supports one or two ATA/ATAPI devices.
It supports PIO modes 0, 3, 4; multi‑word DMA mode 2; and Ultra DMA modes 2, 3, 4.
Two power modes are provided: self‑powered and USB bus‑powered.