Texas Instruments Development Kit for TM4C129x,Tiva™ ARM® Cortex™ -M4 Microcontroller DK-TM4C129X DK-TM4C129X 데이터 시트
제품 코드
DK-TM4C129X
Description
Reset
Type
Name
Bit/Field
IEEE 802.3as Support for 2K Packets
When set, the MAC considers all frames, up to 2,000 bytes in length,
as normal packets. This bit is only valid when the
as normal packets. This bit is only valid when the
JFEN
bit is set to 0.
When
JFEN
is set, configuring
TWOKPEN
has no effect on Giant Frame
status.
Description
Value
If the
JFEN
bit is clear, the MAC considers all received frames
larger than 1,518 bytes (1,522 byes tagged) as Giant Frames.
0
Frames up to 2 KB are considered normal packets.
If the
JFEN
bit is clear, the MAC considers all received frames
larger that 2K bytes as Giant frames.
1
0x0
RW
TWOKPEN
27
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.
compatibility with future products, the value of a reserved bit should be
preserved across a read-modify-write operation.
0x0
RO
reserved
26
CRC Stripping for Type Frames
When set, the last four bytes (Frame Check Sequence FCS) of all frames
of Ether type ((Length/Type field greater than or equal to 0x0600) are
removed before forwarding the frame to the application.
of Ether type ((Length/Type field greater than or equal to 0x0600) are
removed before forwarding the frame to the application.
Description
Value
No bytes are removed.
0
The last four bytes are removed before forwarding.
1
0x0
RW
CST
25
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.
compatibility with future products, the value of a reserved bit should be
preserved across a read-modify-write operation.
0x0
RO
reserved
24
Watchdog Disable
When this bit is set, the MAC disables the internal watchdog counter on
the receiver. The MAC can receive frames of up to 16,384 bytes.
the receiver. The MAC can receive frames of up to 16,384 bytes.
When this bit is cleared, the MAC does not allow more than 2,048 bytes
(10,240 if
(10,240 if
JFEN
is set to 1) of the frame being received. The MAC cuts
off any bytes received after 2,048 bytes.
Description
Value
Watchdog counter enabled.
0
Watchdog counter disabled.
1
0x0
RW
WDDIS
23
Jabber Disable
When this bit is set, the MAC disables the jabber counter on the
transmitter. The MAC can transfer frames of up to 16,384 bytes.
transmitter. The MAC can transfer frames of up to 16,384 bytes.
When this bit is clear, the MAC stops transmission if the application
sends out more than 2,048 bytes of data (10,240 if
sends out more than 2,048 bytes of data (10,240 if
JFEN
is set to 1).
Description
Value
Jabber counter enabled.
0
Jabber counter disabled.
1
0x0
RW
JD
22
1663
December 13, 2013
Texas Instruments-Advance Information
Tiva
™
TM4C129XNCZAD Microcontroller