Adaptec 1737100 Programmer Manual - Page 113

Register Descriptions TxDescQueueConsumerIndex Register Type: R/W Internal Registers Subgroup: Ethernet Functional Registers Byte Address: A4h- A7h Table 7-51. TxDescQueueConsumerIndex Register Reset Bit(s) rw Value Description/Function 31:27 r 0 Reserved: Always read as '0'. 26:16 r 0 HiPrTxConsumerIndex: Written by the AIC-6915 and read by the software driver. This field points to an 8-byte entry in the low-priority DMA descriptor queue. The AIC-6915 increments HIPRTXCONSUMERINDEX after it completes the fetching of the descriptors from host memory. The software driver can write this field only if TXDMAEN is reset to '0'. In this case, the queue is disabled and the AIC-6915 cannot continue on to fetch the next descriptor. The producer and consumer indices point to a doubleword (8-byte) address in the queue. 15:11 r 0 Reserved: Always reads 0. 10:0 r 0 LoPrTxConsumerIndex: Written by the AIC-6915 and read by the software driver. This field points to an 8-byte entry in the low-priority DMA descriptor queue. The AIC-6915 increments LOPRTXCONSUMERINDEX after it completes fetching the descriptors from host memory. The software driver can write this field only if TXDMAEN is reset to '0'. In this case the queue is disabled and the AIC-6915 cannot continue on to fetch the next descriptor. The producer and consumer indices point to a doubleword (8-byte address) in the queue. TxDmaStatus1 Type: R Internal Registers Subgroup: Ethernet Functional Registers Byte Address: A8h - ABh Table 7-52. TxDmaStatus1 Register Reset Bit(s) rw Value Description/Function 31:24 r 0 TxFifoEngineState: Indicates the state of the internal transmit DMA FP FIFO engine state machine. 23:11 r 0 EndOfFrameBufferPtr: This is the current end of frame FIFO Pointer. 10:2 r 0 TxDmaState: Indicates the state of the internal transmit DMA state machine. 1 r 0 Reserved. 0 r 0 Reserved. 7-41