LM3S6938 Luminary Micro, Inc, LM3S6938 Datasheet - Page 426

• Manufacturer Part Number: LM3S6938
• Description: Lm3s6938 Arm Microcontroller
• Manufacturer: Luminary Micro, Inc

Reset
Reset
Type
Type
Ethernet Controller
Ethernet MAC Receive Control (MACRCTL)
Base 0x4004.8000
Offset 0x008
Type R/W, reset 0x0000.0008
426
Bit/Field
31:5
4
3
2
1
0
RO
RO
31
15
0
0
Register 4: Ethernet MAC Receive Control (MACRCTL), offset 0x008
This register enables software to configure the receive module and control the types of frames that
are received from the physical medium. It is important to note that when the receive module is
enabled, all valid frames with a broadcast address of FF-FF-FF-FF-FF-FF in the Destination Address
field is received and stored in the RX FIFO, even if the AMUL bit is not set.
RO
RO
30
14
0
0
RSTFIFO
BADCRC
reserved
RO
RO
29
13
0
0
PRMS
Name
AMUL
RXEN
RO
RO
28
12
0
0
RO
RO
27
11
0
0
Type
R/W
R/W
R/W
R/W
R/W
RO
reserved
RO
RO
26
10
0
0
Reset
0x0
0x0
0x1
0x0
0x0
0x0
RO
RO
25
0
9
0
Preliminary
RO
RO
24
0
8
0
Description
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.
Clear Receive FIFO
When set, clears the receive FIFO. This should be done when software
initialization is performed.
It is recommended that the receiver be disabled (RXEN = 0), and then
the reset initiated (RSTFIFO = 1). This sequence flushes and resets the
RX FIFO.
Enable Reject Bad CRC
The BADCRC bit enables the rejection of frames with an incorrectly
calculated CRC.
Enable Promiscuous Mode
The PRMS bit enables Promiscuous mode, which accepts all valid frames,
regardless of the Destination Address.
Enable Multicast Frames
The AMUL bit enables the reception of multicast frames from the physical
medium.
Enable Receiver
The RXEN bit enables the Ethernet receiver. When this bit is Low, the
receiver is disabled and all frames on the physical medium are ignored.
reserved
RO
RO
23
0
7
0
RO
RO
22
0
6
0
RO
RO
21
0
5
0
RSTFIFO
R/W
RO
20
0
4
0
BADCRC
R/W
RO
19
0
3
1
PRMS
R/W
RO
18
0
2
0
July 25, 2008
AMUL
R/W
RO
17
0
1
0
RXEN
R/W
RO
16
0
0
0