DescriptionResetTypeNameBit/Field
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.
0x0ROreserved21
Jumbo Frame Enable
When this bit is set, the MAC allows jumbo frames of 9,018 bytes (9,022
bytes for VLAN tagged frames) without reporting a giant frame error in
the receive frame status.
DescriptionValue
Jumbo frames create giant frame error.0
Jumbo frames allowed without error.1
0x0RWJFEN20
Inter-Frame Gap (IFG)
These bits control the minimum IFG between frames during transmission.
DescriptionValue
96 bit times0x0
88 bit times0x1
80 bit times0x2
72 bit times0x3
64 bit times0x4
56 bit times0x5
48 bit times0x6
40 bit times0x7
In half-duplex mode, the minimum IFG can be configured only for 64 bit
times (IFG = 0x4). Lower values are not considered.
0x0RWIFG19:17
Disable Carrier Sense During Transmission
When this bit is set, the MAC transmit module ignores carrier sense in
half-duplex mode. Thus, errors are not generated when there is a loss
of carrier or no carrier during transmission. When this bit is clear, the
MAC transmitter generates errors because of carrier sense and can
even abort the transmissions.
DescriptionValue
Generate errors for carrier sense errors.0
Ignore carrier sense errors.1
0x0RWDISCRS16
Port Select
This bit indicates that a 10/100 Mbps interface is supported on this
device. This is a read-only bit.
1ROPS15
Speed
This bit indicates the speed of the interface.
DescriptionValue
10 Mbps0
100 Mbps1
0RWFES14
1473June 18, 2014
Texas Instruments-Production Data
Tiva
™
TM4C1294NCPDT Microcontroller
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