Adaptec 1737100 Programmer Manual - Page 118
RxCompletionQueue1Int
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AIC-6915 Ethernet LAN Controller Programmer's Manual CompletionQueueConsumerIndex Type: R/W Internal Registers Subgroup: Ethernet Functional Registers Byte Address: C4h - C7h Note: A queue is considered empty if both QUEUEPRODUCERINDEX and QUEUECONSUMERINDEX are equal. The queue is considered full if the value of QUEUEPRODUCERINDEX + 1 is equal to the value of QUEUECONSUMERINDEX. If the corresponding COMPLETIONSIZE bit is cleared, the index points to a 4-byte address. If the bit is set, it points to an 8-byte address.. Table 7-59. CompletionQueueConsumerIndex Register Reset Bit(s) rw Value Description/Function 31 r/w 0 TxCompletionThresholdMode: This bit indicates when TxCompletionInt is asserted. In the default state ('0') the interrupt is asserted if the number of empty entries in the queue is less than or equal to a programmable threshold. When the bit is set, the interrupt status bit is asserted if the number of valid completion descriptors in the queue is greater than or equal to the programmable threshold. 30:26 r 0 Reserved: Always read and write 0. 25:16 r/w 0 TxCompletionConsumerIndex: Written by the software driver and read by the AIC-6915. The software driver increments or writes a new index to free space in the queue. 15 r/w 0 RxCompletionQ1ThresholdMode: This bit indicates when RxCompletionQueue1Int is asserted. In the default state ('0') the interrupt is asserted if the number of empty entries in the queue is less than or equal to a programmable threshold. When the bit is set, the interrupt status bit is asserted if the number of valid completion descriptors in the queue is greater than or equal to the programmable threshold. 14:10 r 0 Reserved: Always read and write 0. 9:0 r/w 0 RxCompletionQ1ConsumerIndex: Written by software driver and read by the AIC-6915. The software driver increments or writes a new index to free space in the queue. 7-46