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LM3S6G65-IQC80-A2T

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型号: LM3S6G65-IQC80-A2T
PDF文件:
  • LM3S6G65-IQC80-A2T PDF文件
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功能描述: Stellaris® LM3S6G65 Microcontroller
PDF文件大小: 6152.12 Kbytes
PDF页数: 共1044页
制造商: TI1[Texas Instruments]
制造商LOGO: TI1[Texas Instruments] LOGO
制造商网址: http://www.ti.com
捡单宝LM3S6G65-IQC80-A2T
PDF页面索引
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120%
Register 8: Ethernet MAC Threshold (MACTHR), offset 0x01C
In order to increase the transmission rate, it is possible to program the Ethernet Controller to begin
transmission of the next frame prior to the completion of the transmission of the current frame.
Caution Extreme care must be used when implementing this function. Software must be able to
guarantee that the complete frame is able to be stored in the transmission FIFO prior to the completion
of the transmission frame.
This register enables software to set the threshold level at which the transmission of the frame
begins. If the THRESH bits are set to 0x3F, which is the reset value, the early transmission feature
is disabled, and transmission does not start until the NEWTX bit is set in the MACTR register.
Writing the THRESH field to any value besides 0x3F enables the early transmission feature. Once
the byte count of data in the TX FIFO reaches the value derived from the THRESH bits as shown
below, transmission of the frame begins. When the THRESH field is clear, transmission of the frame
begins after 4 bytes (a single write) are stored in the TX FIFO. Each increment of the THRESH bit
field waits for an additional 32 bytes of data (eight writes) to be stored in the TX FIFO. Therefore,
a value of 0x01 causes the transmitter to wait for 36 bytes of data to be written while a value of 0x02
makes the wait equal to 68 bytes of written data. In general, early transmission starts when:
Number of Bytes ≥ 4 ((THRESH x 8) + 1)
Reaching the threshold level has the same effect as setting the NEWTX bit in the MACTR register.
Transmission of the frame begins, and then the number of bytes indicated by the Data Length field
is transmitted. Because underrun checking is not performed, if any event, such as an interrupt,
delays the filling of the FIFO, the tail pointer may reach and pass the write pointer in the TX FIFO.
In this event, indeterminate values are transmitted rather than the end of the frame. Therefore,
sufficient bus bandwidth for writing to the TX FIFO must be guaranteed by the software.
If a frame smaller than the threshold level must be sent, the NEWTX bit in the MACTR register must
be set with an explicit write, which initiates the transmission of the frame even though the threshold
limit has not been reached.
If the threshold level is set too small, it is possible for the transmitter to underrun. If this occurs, the
transmit frame is aborted, and a transmit error occurs. Note that in this case, the TXER bit in the
MACRIS is not set, meaning that the CPU receives no indication that a transmit error happened.
Ethernet MAC Threshold (MACTHR)
Base 0x4004.8000
Offset 0x01C
Type R/W, reset 0x0000.003F
16171819202122232425262728293031
reserved
ROROROROROROROROROROROROROROROROType
0000000000000000Reset
0123456789101112131415
THRESHreserved
R/WR/WR/WR/WR/WR/WROROROROROROROROROROType
1111110000000000Reset
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.
0ROreserved31:6
July 24, 2012784
Texas Instruments-Production Data
Ethernet Controller
OBSOLETE: TI has discontinued production of this device.
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