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Field
Name
R/W
Description
13
DISRXO
R/W
Disable Receive Own
When it is confirmed that phy_txen_o is in half-duplex mode, MAC will
disable receiving frames. When this bit is reset, MAC will receive all
packets transmitted by PHY. This bit is not applicable if the MAC is
working in full-duplex mode.
14
SSEL
R/W
Speed select
0
:
10Mbps
1
:
100Mbps
15
Reserved
16
DISCRS
R/W
Disable Carrier Sense During Transmission
When it is set to high, the MAC transmitter will ignore the MII CRS
signal during frame transmission in half-duplex mode. This request
results in no error due to carrier loss or no carrier in such transmission
process. When it is set to low, the MAC transmitter will generate a
carrier sense error and can even abort the transmission.
19:17
IFG
R/W
Inter-Frame Gap
These bits are used to control the minimum gap between frames during
transmission.
000: 96-bit time
001: 88-bit time
010: 80-bit time
…
111: 40-bit time
In half-duplex mode, the minimum IFG can only be configured as 64 bits
(IFG=100), and lower value will not be considered.
21:20
Reserved
22
JDIS
R/W
Jabber Disable
The MAC disables the Jabber timer on transmitting end. MAC can
transmit up to 16384 bytes frames. When this bit is reset, if the
application program transmits more than 2048 bytes of data during
transmission, the MAC will cut off the transmitter.
23
WDTDIS
R/W
Watchdog Disable
The MAC disables the watchdog timer on the receiving end. The MAC
can receive up to 16384 bytes of frames. When this bit is reset, the
MAC does not allow the received frame to exceed 2048 bytes or the
watchdog timeout register. After the watchdog limits the number of
bytes, the MAC will disable receiving any bytes.
24
Reserved
25
CST
R/W
CRC Stripping for Type Frames
The last 4 bytes of all Ethernet type frames are removed and deleted
before they are forwarded to the application program.
31:26
Reserved
Frame filter register (MAC_FRAF)
Offset address: 0x04
Reset value: 0x0000 0000