748
/
838
Nations Technologies Inc.
Tel
：
+86-755-86309900
：
Address: Nations Tower, #109 Baoshen Road, Hi-tech Park North.
Nanshan District, Shenzhen, 518057, P.R.China
Offset
Register
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Reset Value
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
25.5.2
ETH MAC configuration register (ETH_MACCFG)
Address offset: 0x0000
Reset value: 0x0000 8000
MAC configuration register is the operating mode register of the MAC. It defines the working mode of receiving and
sending.
Bit field
Name
Description
31:24
Reserved
Reserved, the reset value must be maintained.
23
WD
Disable watchdog.
0: Frames exceeding 2048 bytes are not allowed to be received, and data exceeding
2048 bytes will be truncated.
1: Turn off receive watchdog timer, and MAC can receive frames with a maximum
length of 16383 bytes.
22
JD
Disable Jabber detection.
0: Allows transmit frames of up to 2048 bytes.
1: Disable Jabber timer, and MAC can transmit frames of up to 16383 bytes.
21:20
Reserved
Reserved, the reset value must be maintained.
19:17
IFG[2:0]
Frame gap selection.
These bits are used to control the shortest gap between two transmitted frames.
000: 96-bit time
001: 88-bit time
010: 80-bit time
...
111: 40-bit time
In half-duplex mode, these bits can be configured with a minimum interframe gap of
64-bit time.
16
DCRS
Disable carrier sense function.
0: MAC will report an error and terminate the transmission when the carrier signal is
wrong.
1: In half-duplex mode, MAC will ignore the CRS signal of MII in the process of
sending the frame, and no error will be reported if the carrier is lost or there is no
carrier.
15
Reserved
Reserved, the reset value must be maintained.
