LM3S9997 Datasheet, PDF (785/1218 Pages) Texas Instruments – Stellaris® LM3S9997 Microcontroller

Stellaris® LM3S9997 Microcontroller
Register 3: Ethernet MAC Receive Control (MACRCTL), offset 0x008
This register configures the receiver and controls the types of frames that are received.
It is important to note that when the receiver is enabled, all valid frames with a broadcast address
of FF-FF-FF-FF-FF-FF in the Destination Address field are received and stored in the RX FIFO,
even if the AMUL bit is not set.
Ethernet MAC Receive Control (MACRCTL)
Base 0x4004.8000
Offset 0x008
Type R/W, reset 0x0000.0008
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
reserved
Type RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
Reset
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
reserved
RSTFIFO BADCRC PRMS AMUL RXEN
Type RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
R/W
R/W
R/W
R/W
R/W
Reset
0
0
0
0
0
0
0
0
0
0
0
0
1
0
0
0
Bit/Field
31:5
4
3
Name
reserved
RSTFIFO
BADCRC
Type
Reset Description
RO 0x0000.000 Software should not rely on the value of a reserved bit. To provide
compatibility with future products, the value of a reserved bit should be
preserved across a read-modify-write operation.
R/W
0
Clear Receive FIFO
Value Description
1 Clear the receive FIFO. The receive FIFO should be cleared
when software initialization is performed.
0 No effect.
This bit is automatically cleared when read.
The receiver should be disabled (RXEN = 0), before a reset is initiated
(RSTFIFO = 1). This sequence flushes and resets the RX FIFO.
R/W
1
Enable Reject Bad CRC
Value Description
1 Enables the rejection of frames with an incorrectly calculated
CRC. If a bad CRC is encountered, the RXER bit in the MACRIS
register is set and the receiver FIFO is reset.
0 Disables the rejection of frames with an incorrectly calculated
CRC.
2
PRMS
R/W
0
Enable Promiscuous Mode
Value Description
1 Enables Promiscuous mode, which accepts all valid frames,
regardless of the specified Destination Address.
0 Disables Promiscuous mode, accepting only frames with the
programmed Destination Address.
June 15, 2010
785
Texas Instruments-Advance Information