MOTOROLA 30-W2960B01A模塊卡件
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MOTOROLA 30-W2960B01A是一種控制器卡件模塊
MOTOROLA 30-W2960B01A增加了對消息信號中斷CI中斷線路的電平觸發(fā)。這是通過選擇邊緣觸發(fā)來獲得優(yōu)勢的，以在服務(wù)共享中斷線時獲得健壯性。PCI規(guī)范的后續(xù)版本增加了對消息信號中斷的支持
MOTOROLA MVME712A/AM指定了它所實現(xiàn)的功能和寄存器。這類似于I/O讀取，但是從PCI配置空間讀取。只有當(dāng)?shù)刂返牡?1位指定了它所實現(xiàn)的功能和寄存器，并且特殊的IDSEL信號被置位時，MOTOROLA 30-W2960B01A器件才必須做出響應(yīng)。它必須忽略高21位。PCI配置空間允許突發(fā)讀?。ㄊ褂镁€性遞增）。
MOTOROLA 30-W2960B01A與I/O空間不同，標(biāo)準(zhǔn)PCI配置寄存器的定義使得讀操作永遠(yuǎn)不會干擾設(shè)備的狀態(tài)。設(shè)備的配置空間寄存器可能會超過標(biāo)準(zhǔn)的64字節(jié)，這會產(chǎn)生讀取副作用，但這種情況很少見。MOTOROLA 30-W2960B01A配置空間訪問通常有幾個周期的延遲，以允許IDSEL線路穩(wěn)定，這使得它們比其他形式的訪問慢
MOTOROLA 30-W2960B01A is a controller card module
MOTOROLA 30-W2960B01A adds a level trigger for message signal interrupt CI interrupt lines. This is achieved by selecting edge triggers to gain advantage in order to achieve robustness when services share interruption lines. Subsequent versions of the PCI specification have added support for message signal interrupts
MOTOROLA MVME712A/AM specifies the functions and registers it implements. This is similar to an I/O read, but read from the PCI configuration space. The MOTOROLA 30-W2960B01A device must respond only when the lower 11 bits of the address specify the function and register it implements, and the special IDSEL signal is set. It must ignore the high 21 bits. PCI configuration space allows for burst reads (using linear increments).
MOTOROLA 30-W2960B01A differs from I/O space in that the definition of a standard PCI configuration register ensures that read operations never interfere with the state of the device. The device's configuration space register may exceed the standard 64 bytes, which can have a read side effect, but this is rare. MOTOROLA 30-W2960B01A configuration space access typically has several cycles of delay to allow IDSEL lines to stabilize, which makes them slower than other forms of access
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