LAN9221_12 Datasheet, PDF (85/151 Pages) SMSC Corporation – High-Performance 16-bit Non-PCI 10/100 Ethernet Controller with Variable Voltage I/O

High-Performance 16-bit Non-PCI 10/100 Ethernet Controller with Variable Voltage I/O
Datasheet
5.3.5 BYTE_TEST—Byte Order Test Register
Offset:
64h
Size:
32 bits
This register can be used to determine the byte ordering of the current configuration
BITS
31:0 Byte Test
DESCRIPTION
TYPE
RO
DEFAULT
87654321h
5.3.6 FIFO_INT—FIFO Level Interrupts
Offset:
68h
Size:
32 bits
This register configures the limits where the FIFO Controllers will generate system interrupts.
BITS
DESCRIPTION
31-24
23-16
15-8
TX Data Available Level. The value in this field sets the level, in number
of 64 Byte blocks, at which the TX FIFO Available interrupt (TFDA) will be
generated. When the TX data FIFO free space is greater than this value a
TX FIFO Available interrupt (TDFA) will be generated.
TX Status Level. The value in this field sets the level, in number of
DWORDs, at which the TX Status FIFO Level interrupt (TSFL) will be
generated. When the TX Status FIFO used space is greater than this value
an TX Status FIFO Level interrupt (TSFL) will be generated.
Reserved
7-0 RX Status Level. The value in this field sets the level, in number of
DWORDs, at which the RX Status FIFO Level interrupt (RSFL) will be
generated. When the RX Status FIFO used space is greater than this value
an RX Status FIFO Level interrupt (RSFL) will be generated.
TYPE
R/W
R/W
RO
R/W
DEFAULT
48h
00h
-
00h
SMSC LAN9221/LAN9221i
85
DATASHEET
Revision 2.9 (03-01-12)