大量篇幅介紹VxD 程式設(shè)計的技術(shù)與實作細節(jié)（包括 Plug & Play device,
Communication Driver, Serial Port, VCOMM, IOS, IFS... ）。其內(nèi)容之詳盡豐富，技術(shù)之深刻紮
實，實在是這個領(lǐng)域的罕見好書
This document describes how to switch to and program the unisersal serial bus (USB)
analog phase-locked loop (APLL) on the C5506/C5507/C5509A devices. Example
assembly programs for programming and switching to and from the APLL are also
provided in the attached zip file. It is assumed that the reader is familiar with the use
and operation of the C5506/C5507/C5509A USB digital phase-locked loop (DPLL) and
C55x™ Digital Signal Processor (DSP) IDLE procedures.
