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
Pause Low Threshold
This field configures the threshold of the PAUSE timer at which the input
flow control signal is checked for automatic retransmission of PAUSE
Frame.
flow control signal is checked for automatic retransmission of PAUSE
Frame.
The threshold values should be always less than the Pause Time (
PT
)
configured in Bits[31:16]. For example, if
PT
= 0x0100 (256 slot-times),
and
PLT
= 0x1, then a second PAUSE frame is automatically transmitted.
The following list provides the threshold values for different values:
Description
Value
The threshold is Pause time minus 4 slot times (
PT
- 4 slot
times).
0x0
The threshold is Pause time minus 28 slot times (
PT
- 28 slot
times).
0x1
The threshold is Pause time minus 144 slot times (
PT
- 144 slot
times).
0x2
The threshold is Pause time minus 256 slot times (
PT
- 256 slot
times).
0x3
The slot time is defined as the time taken to transmit 512 bits (64 bytes)
on the MII interface.
on the MII interface.
0x0
RW
PLT
5:4
Unicast Pause Frame Detect
Description
Value
MAC detects only a Pause frame with the unique multicast
address specified in the 802.3x standard.
address specified in the 802.3x standard.
0
The MAC detects the pause frames with the station's unicast
address specified in the EMACADDR0H and EMACADDR0L
register, in addition to detecting pause frames with the unique
multicast address.
address specified in the EMACADDR0H and EMACADDR0L
register, in addition to detecting pause frames with the unique
multicast address.
1
0x0
RW
UP
3
Receive Flow Control Enable
Description
Value
The decode function of the pause frame is disabled.
0
The MAC decodes the received pause frame and disables its
transmitter for a specified (pause) time.
transmitter for a specified (pause) time.
1
0x0
RW
RFE
2
Transmit Flow Control Enable
Description
Value
In full duplex mode, the flow control operation in the MAC is
disabled, and the MAC does not transmit any pause frames.
disabled, and the MAC does not transmit any pause frames.
In half duplex mode, the back-pressure feature is disabled.
0
In the full-duplex mode, the MAC enables the flow control
operation to transmit pause frames.
operation to transmit pause frames.
In half-duplex mode, the MAC enables the back-pressure
operation.
operation.
1
0x0
RW
TFE
1
1679
December 13, 2013
Texas Instruments-Advance Information
Tiva
™
TM4C129XNCZAD Microcontroller