LAN9115_05 Datasheet, PDF (79/131 Pages) SMSC Corporation – Highly Efficient Single- Chip 10/100 Non-PCI Ethernet Controller

Highly Efficient Single-Chip 10/100 Non-PCI Ethernet Controller
Datasheet
BITS
15
14-13
12-8
7-0
DESCRIPTION
Force RX Discard (RX_DUMP). This self-clearing bit clears the RX data
and status FIFOs of all pending data. When a ‘1’ is written, the RX data
and status pointers are cleared to zero.
Note:
Please refer to section “Force Receiver Discard (Receiver
Dump)” on page 59 for a detailed description regarding the use
of RX_DUMP.
Reserved
RX Data Offset (RXDOFF). This field controls the offset value, in bytes,
that is added to the beginning of an RX data packet. The start of the valid
data will be shifted by the number of bytes specified in this field. An offset
of 0-31 bytes is a valid number of offset bytes.
Note:
The two LSBs of this field (D[9:8]) must not be modified while
the RX is running. The receiver must be halted, and all data
purged before these two bits can be modified. The upper three
bits (DWORD offset) may be modified while the receiver is
running. Modifications to the upper bits will take affect on the
next DWORD read.
Reserved
TYPE
SC
RO
R/W
RO
DEFAULT
0
-
00000
-
Table 5.2 RX Alignment Bit Definitions
[31]
[30]
0
0
0
1
1
0
1
1
End Alignment
4-byte alignment
16-byte alignment
32-byte alignment
Reserved
5.3.8 TX_CFG—Transmit Configuration Register
Offset:
70h
Size:
32 bits
This register controls the transmit functions on the LAN9115 Ethernet Controller.
BITS DESCRIPTION
31-16 Reserved.
15
14
13-3
Force TX Status Discard (TXS_DUMP). This self-clearing bit clears the TX
status FIFO of all pending status DWORD’s. When a ‘1’ is written, the TX
status pointers are cleared to zero.
Force TX Data Discard (TXD_DUMP). This self-clearing bit clears the TX
data FIFO of all pending data. When a ‘1’ is written, the TX data pointers
are cleared to zero.
Reserved
TYPE
RO
SC
SC
RO
DEFAULT
-
0
0
-
SMSC LAN9115
79
DATASHEET
Revision 1.1 (05-17-05)