Technical information

7-63
Register Descriptions
BacDmaDiagnostic2 Register
Type: R
Internal Registers Subgroup: PCI Extra Registers
Byte Address: 0118h - 011Bh
This register provides information about the current DMA transfer and is used for
diagnostic purposes only. All values in the register are synchronized to the Ethernet
clock.
Table 7-79. BacDmaDiagnostic2 Register
Bit(s) rw
Reset
Value Description/Function
31:29 r 0
Reserved
: Always read as 0.
28:16 r 1X
EtherFifoPtr[12:0]:
Indicates the byte address of the current DMA
requester FIFO pointer.
15:13 r 0
Reserved
: Always read as 0.
12:0 r X
EtherFifoSpace[12:0]:
Indicates the actual number of data bytes in
the FIFO during a DMA read operation, or the number of empty
bytes in the FIFO during a DMA write operation. This information
is provided by the BAC to the DMA requester module during an
active DMA transfer.