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Intel USB2.0 UTMI 接口
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2009-04-06
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High volume USB 2.0 devices will be designed using ASIC technology with embedded USB 2.0 support.For full-speed USB devices the operating frequency was low enough to allow data recovery to be handled in a vendors VHDL code, with the ASIC vendor providing only a simple level translator to meet the USB signaling requirements. Today's gate arrays operate comfortably between 30 and 60 MHz. With USB 2.0 signaling running at hundreds of MHz, the existing design methodology must change.As operating frequencies go up it becomes more difficult to compile VHDL code without modification.This document defines the USB 2.0 Transceiver Macrocell Interface (UTMI) and many operational aspects of the USB 2.0 Transceiver Macrocell (UTM). The intent of the UTMI is to accelerate USB 2.0 peripheral development. This document defines an interface to which ASIC and peripheral vendors can develop.ASIC vendors and foundries will implement the UTM and add it to their device libraries. Peripheral and IP vendors will be able to develop their designs, insulated from the high-speed and analog circuitry issues associated with the USB 2.0 interface, thus minimizing the time and risk of their development cycles.The figure below summarizes a number of concepts expressed throughout this spec. There are assumed to be three major functional blocks in a USB 2.0 peripheral ASIC design: the USB 2.0 Transceiver Macrocell,the Serial Interface Engine (SIE), and the device specific logic.
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