ei803  模塊

ei803 主器件生成一個(gè)EtherCAT數(shù)據(jù)幀；所有從器件接收和處理這個(gè)數(shù)據(jù)幀。后一個(gè)從器件回送這個(gè)EtherCAT數(shù)據(jù)幀，而這個(gè)數(shù)據(jù)幀在經(jīng)歷所有從器件（無需進(jìn)一步處理）后，返回到主器件。這個(gè)EtherCAT數(shù)據(jù)幀已經(jīng)為每個(gè)從器件的數(shù)據(jù)處理預(yù)留了空間，而所有的從器件都不會(huì)更改數(shù)據(jù)幀本身的長(zhǎng)度。這有點(diǎn)兒像為乘客準(zhǔn)備了多個(gè)車廂和座位的火車一樣，每個(gè)從器件都有一個(gè)指定的車廂或指定的座位。EtherCAT允許到“座位”層的尋址—而數(shù)據(jù)處理是在數(shù)據(jù)位上進(jìn)行的。

一個(gè)EtherCAT主器件只需要一個(gè)標(biāo)準(zhǔn)以太網(wǎng)MAC外設(shè)，這是因?yàn)橹髌骷趯?shí)時(shí)處理EtherCAT數(shù)據(jù)幀方面沒有特定的需要。主器件只需要用準(zhǔn)確的時(shí)基來觸發(fā)啟動(dòng)EtherCAT數(shù)據(jù)幀。

一個(gè)EtherCAT從器件需要特定的以太網(wǎng)硬件 (EtherCAT MAC) 支持—通常的實(shí)現(xiàn)方式是圖2中所示的專門用途集成電路 (ASIC) 或現(xiàn)場(chǎng)可編程門陣列 (FPGA) –這是因?yàn)樗枰幚碓谶\(yùn)行過程中進(jìn)入的EtherCAT數(shù)據(jù)幀。這意味著EtherCAT MAC在進(jìn)行數(shù)據(jù)幀接收的同時(shí)，要處理EtherCAT數(shù)據(jù)幀。典型的EtherCAT器件在已接收和已發(fā)送數(shù)據(jù)幀之間具有1μs的端口到端口延遲。

ei803 

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