Technical information

7-64
AIC-6915 Ethernet LAN Controller Programmer’s Manual
BacDmaDiagnostic3 Register
Type: R
Internal Registers Subgroup: PCI Functional Registers
Byte Address: 011Ch - 011Fh
Table 7-80. BACDMADiagnostic3 Register
Bit(s) rw
Reset
Value Description/Function
31:25 r 0
Reserved
: Always read as 0.
24 r 0
IllegalDmaReq:
This bit is set during a receive DMA request when
the host address is not aligned on a (32-bit) word boundary.
23 r 0
TxDmaReq:
Is the fifth highest priority DMA request line. By
default, it has the same priority as
RxDmaReq
. If
PreferTxDmaReq
in the
BacControlStatus
register is set,
TxDmaReq
gets higher
priority then
RxDmaReq
.
22 r 0
RxDmaReq:
Is the fifth highest priority DMA request line. By
default, it has the same priority as
TxDmaReq
. If
PreferRxDmaReq
in the
BacControlStatus
register is set,
RxDmaReq
gets higher
priority than
TxDmaReq
.
21 r 0
RxStatusReq:
Is the fourth highest priority DMA request line and is
connected to the receive completion descriptor request line.
20 r 0
TxStatusReq:
Is the third highest priority DMA request line and is
connected to the transmit completion descriptor request line.
19 r 0
RxDescReq:
Is the second highest priority DMA request line and is
connected to the receive DMA descriptor request line.
18 r 0
TxDescReq:
Is the first and highest priority DMA request line and is
connected to the transmit DMA descriptor request line.
17 r 0
TxDmaGnt:
Specifies that the current (or last if no other transfers
since then) DMA grant was given to the transmit DMA requester.
16 r 0
RxDmaGnt:
Specifies that the current (or last if no other transfers
since then) DMA grant was given to the receive DMA requester.
15 r 0
TxStatusGnt:
Specifies that the current (or last if no other transfers
since then) DMA grant was given to the transmit status.
14 r 0
RxStatusGnt:
Specifies that the current (or last if no other transfers
since then) DMA grant was given to the receive status.
13 r 0
TxDescGnt:
Specifies that the current (or last if no other transfers
since then) DMA grant was given to the transmit descriptors.
12 r 0
RxDescGnt:
Specifies that the current (or last if no other transfers
since then) DMA grant was given to the receive descriptor.
11:0 r 0
Reserved:
Always reads 0.