16-bit High-Performance Single-Chip 10/100 Ethernet Controller with HP Auto-MDIX
Datasheet
5.3.11
RX_FIFO_INF—Receive FIFO Information Register
Offset:
7Ch
Size:
32 bits
This register contains the used space in the receive FIFOs of the LAN9217 Ethernet Controller.
BITS
31-24
23-16
DESCRIPTION
TYPE
RO
DEFAULT
Reserved
-
RX Status FIFO Used Space (RXSUSED). Indicates the amount of space
in DWORDs, used in the RX Status FIFO.
RO
00h
15-0
RX Data FIFO Used Space (RXDUSED).). Reads the amount of space in
bytes, used in the RX data FIFO. For each receive frame, this field is
incremented by the length of the receive data rounded up to the nearest
DWORD (if the payload does not end on a DWORD boundary).
RO
0000h
5.3.12
TX_FIFO_INF—Transmit FIFO Information Register
Offset:
80h
Size:
32 bits
This register contains the free space in the transmit data FIFO and the used space in the transmit
status FIFO in the LAN9217.
BITS
31-24
23-16
DESCRIPTION
TYPE
RO
DEFAULT
Reserved
-
TX Status FIFO Used Space (TXSUSED). Indicates the amount of space
in DWORDS used in the TX Status FIFO.
RO
00h
15-0
TX Data FIFO Free Space (TDFREE). Reads the amount of space in bytes,
available in the TX data FIFO. The application should never write more data
than is available, as indicated by this value.
RO
1200h
SMSC LAN9217
Revision 1.5 (07-18-06)
DATA8S5HEET
SMSC [ SMSC CORPORATION ]
