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按功能表設(shè)置MODESEL［3：0］引腳電平可規(guī)定LED的工作模式。設(shè)置MTXD［3：1］引腳可實(shí)現(xiàn)全雙工和半雙工模式。設(shè)置MIIS［1：0］引腳使KS8993的MII接口工作在forward或reverse模式。設(shè)置MRXD［0］引腳為高電平，KS8993可禁止MAC3的自動(dòng)協(xié)商功能。設(shè)置MRXD引腳為低電平，使KS8993的MAC3工作在半雙工模式。諸如此類，靈活設(shè)置這些非管理編程接口電平還可以實(shí)現(xiàn)自動(dòng)協(xié)商機(jī)制、MAC地址自學(xué)習(xí)、符合802.1p的優(yōu)先級(jí)排隊(duì)、自更新等功能。
3.6 控制和其他接口
接外部晶振或輸入時(shí)鐘信號(hào)和系統(tǒng)復(fù)位信號(hào)。
3.7 電源和地接口
KS8993采用單2.5V工作電壓，包括收發(fā)驅(qū)動(dòng)器在內(nèi)的總功耗為300mA（750mW），具有低損耗特性。
4 典型應(yīng)用
KS8993包含3端口10/100自適應(yīng)物理層收發(fā)器和3個(gè)帶有一個(gè)Layer 2交換器的MAC單元。
在實(shí)際應(yīng)用中，KS8993既可以配置為一個(gè)獨(dú)立的3端口器件，如圖3（a）所示，也可以為了滿足需要（如將DSL與一部IP電話和PC相連時(shí)），配置成為兩端口加一個(gè)MII端口的形式，如圖3（b）所示。MII端口可以連接外部處理器，用于路由目的和公共網(wǎng)絡(luò)訪問。
圖4是KS8993在IP電話中的應(yīng)用。端口1連接個(gè)人計(jì)算機(jī)，端口2連接電話，端口3則設(shè)置成MII端口，用于路由目的。
KS8993的每一個(gè)端口都設(shè)有一個(gè)3位的VLAN掩碼寄存器（PV1、PV2和PV3）。通過設(shè)置寄存器中的掩碼，可以設(shè)定KS8993中3個(gè)端口的功能，其中，一個(gè)典型的應(yīng)用是將2個(gè)端口設(shè)置成轉(zhuǎn)換器，另一個(gè)端口設(shè)置為路由器。要實(shí)現(xiàn)這一功能，3個(gè)VLAN掩碼寄存器的設(shè)置為PV1（1，0，1）、PV2（0，1，1）和PV3（1，1，1）。在這個(gè)設(shè)置中，KS8993可以用于連接2個(gè)VLAN，VLAN1包括端口1和端口3，VLAN2包括端口2和端口3。當(dāng)VMDIS（Vlan Mismatch DIScard）＝1時(shí)，端口1和端口2之間不能直接通信，此時(shí)端口3就要在端口1所屬的VLAN1和端口2所屬的VLAN2之間進(jìn)行路由選擇。當(dāng)VMDIS＝0時(shí)，如果端口收發(fā)的是廣播數(shù)據(jù)包，則所有端口之間都可以直接通信；如果端口收發(fā)的是多播數(shù)據(jù)包，那么這些數(shù)據(jù)包的傳輸將被限制在同一個(gè)VLAN中。VMDIS＝0這種特性常被用于廣播/多播協(xié)議轉(zhuǎn)換。
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