Adaptec 1737100 Programmer Manual - Page 183

Sample Driver Required Fields: - RxCompletionQ1ConsumerIndex = 0: Initialize the Receive Completion Descriptor Queue 1 consumer index to zero. Note: this entry is also covered in the Receive Initialization section. - TxCompletionConsumerIndex = 0: Initialize the Transmit Completion Descriptor Queue consumer index to zero. 11 COMPLETIONQUEUE1PRODUCERINDEX (offset C8h): This register contains both the Receive and Transmit Completion Descriptor Queue producer indices. Required Fields: - RxCompletionQ1ProducerIndex = 0: Initialize the Receive Completion Descriptor Queue 1 producer index to zero. Note: this entry is also covered in the Receive Initialization section. - TxCompletionProducerIndex = 0: Initialize the Transmit Completion Descriptor Queue producer index to zero. 12 RXCOMPLETIONQ2PTRS (offset CCh): This register is used only if two receive completion queues are implemented. In this case, RxCompletionQ2ConsumerIndex should be initialized to zero. Example: // Windows NT driver example // Single Transmit Completion and Buffer Descriptor Queues // Type 1 32 bit buffer descriptors with an 8-byte skip field // First, setup all fields in the descriptor control register // This includes the descriptor type, minimum spacing, and skip length TxDescQCtrlValue.TxDescType = 1; // basic 32 bit buffer descriptor TxDescQCtrlValue.DisableTxCompletion = 0; // do not disable TX interrupts TxDescQCtrlValue.MinFrameDescSpacing = 0; // no restrictions TxDescQCtrlValue.TxDescQ64bitAddr = 0; // using 32 bit descriptors TxDescQCtrlValue.TxDmaBurstSize = Adapter->TxDmaBurstSize; // from registry TxDescQCtrlValue.SkipLength = 1; // 8 byte skip field length TxDescQCtrlValue.TxHighPriorityFifoThreshold = Adapter->TxHighPriorityFifoThreshold; // from registry AIC6915_WRITE_REG(TxDescQCtrl, TxDescQCtrlValue); // We're using a single buffer descriptor queue // Use the low priority queue (could use either one) 8-23