IC697MDL252
在完成了Verilog 代碼設(shè)計(jì)后，我們進(jìn)行了仿真、綜合驗(yàn)證，前仿用Modelsim、綜合用Synplify Pro、 綜合后仿真用Cadence 中的NC_Verilog，主要由于NC_Verilog 在后仿中的速度要優(yōu)于Modelsim，提高了效 率；圖5 是用NC_Verilog 仿真設(shè)備的枚舉過程；
任何USB 的數(shù)據(jù)傳輸都是建立在成功通過枚舉的基礎(chǔ)上的，只有正確完成了枚舉，USB 主機(jī)和設(shè)備之 間的通信才正在建立起來。所以枚舉是USB 通信的最關(guān)鍵的一步。在驗(yàn)證過程中模擬了PC 主機(jī)向設(shè)備發(fā)送 各種命令來完成枚舉。在圖5 中pid［3:0］中D、3、9、2、1、B 分別表示Setup、DATA0、IN、Ack、Out、 DATA1。當(dāng)設(shè)備插上PC 時(shí)主機(jī)會(huì)持續(xù)的SE0 來復(fù)位設(shè)備，這時(shí)設(shè)備的地址默認(rèn)為00，然后主機(jī)第一次發(fā)送 Setup 包來獲取設(shè)備的前8 個(gè)設(shè)備描述符，當(dāng)設(shè)備成功返回?cái)?shù)據(jù)后，主機(jī)第二次發(fā)送Setup 包來給設(shè)備配 置地址，從圖中faddr［7:0］可以看出我們給設(shè)備配置的地址為02，在這以后主機(jī)都是通過這個(gè)地址向設(shè)備 獲取全部的18 個(gè)設(shè)備描述符和全部的配置描述符集，在取完這些描述符后主機(jī)對設(shè)備進(jìn)行配置，主機(jī)就識(shí) 別出設(shè)備了。
IC697MDL252聯(lián)系人：李先生
手機(jī)：18030229050
電話：0592-5709821
傳真：0592-5709828
QQ 1878187406
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IC697MDL252FISHER PROVOX CL7661X1-BA1 MPU/MEM CL7661X1-A5 MPU P2.2
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PARKER COMPUMOTOR PLUS CPHX106-220-S CPHX106-220
