Adaptec 1737100 Programmer Manual - Page 112

AIC-6915 Ethernet LAN Controller Programmer's Manual TxDescQueueHighAddr Register Type: R/W Internal Registers Subgroup: Ethernet Functional Registers Byte Address: 9Ch - 9Fh Table 7-49. TxDescQueueHighAddr Register Reset Bit(s) rw Value Description/Function 31:0 r/w 0 TxDescQueueHighAddr[31:0]: Contains the upper 32-bits of address of the transmit descriptor queues when using 64-bit addressing. TxDescQueueProducerIndex Register Type: R/W Internal Registers Subgroup: Ethernet Functional Registers Byte Address: A0h- A3h Table 7-50. TxDescQueueProducerIndex Register Reset Bit(s) rw Value Description/Function 31:27 r 0 Reserved: Always read as 0. 26:16 r/w 0 HiPrTxProducerIndex Written by the software driver and read by the AIC-6915. When the software driver wants to transmit a frame, it adds the frame buffer descriptor to the low-priority queue, then updates the Producer Index to point to the next empty location in the queue. 15:11 r 0 Reserved: Always read as 0. 10:0 r/w 0 LoPrTxProducerIndex: Written by the software driver and read by the AIC-6915. When the software driver wants to transmit a frame, it adds the frame buffer descriptor to the low-priority queue, then updates the Producer Index to point to the next empty location in the queue. 7-40