Section 21 Ethernet Controller Direct Memory Access Controller (E-DMAC)
Rev. 1.00 Mar. 12, 2008 Page 808 of 1178
REJ09B0403-0100
21.2.9
Receive Missed-Frame Counter Register (RMFCR)
RMFCR is a 16-bit counter that indicates the number of frames missed (discarded, and not
transferred to the receive buffer) during reception. When the receive FIFO overflows, the receive
frames in the FIFO are discarded. The number of frames discarded at this time is counted. When
the value in this register reaches H'FFFF, counting-up is halted. When this register is read, the
counter value is cleared to 0. Write operations to this register have no effect.
Bit Bit
Name
Initial
value
R/W Description
31 to 16
All
0
R
Reserved
These bits are always read as 0. The initial value
should not be changed.
15 to 0
MFC15 to
MFC0
All 0
R
Missed-Frame Counter
Indicate the number of frames that are discarded and
not transferred to the receive buffer during reception.
21.2.10 Transmit FIFO Threshold Register (TFTR)
TFTR is a 32-bit readable/writable register that specifies the transmit FIFO threshold at which the
first transmission is started. The actual threshold is 4 times the set value. The EtherC starts
transmission when the amount of data in the transmit FIFO exceeds the number of bytes specified
by this register, when the transmit FIFO is full, or when 1-frame write is executed. When setting
this register, do so in the transmission-halt state.
Bit Bit
Name
Initial
value
R/W Description
31 to 11
All
0
R
Reserved
These bits are always read as 0. The initial value
should not be changed.
Содержание H8S Family
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Страница 206: ...Section 6 Bus Controller BSC Rev 1 00 Mar 12 2008 Page 158 of 1178 REJ09B0403 0100...
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Страница 476: ...Section 12 Watchdog Timer WDT Rev 1 00 Mar 12 2008 Page 428 of 1178 REJ09B0403 0100...
Страница 552: ...Section 14 CRC Operation Circuit CRC Rev 1 00 Mar 12 2008 Page 504 of 1178 REJ09B0403 0100...
Страница 588: ...Section 15 Serial Communication Interface with FIFO SCIF Rev 1 00 Mar 12 2008 Page 540 of 1178 REJ09B0403 0100...
Страница 632: ...Section 17 Synchronous Serial Communication Unit SSU Rev 1 00 Mar 12 2008 Page 584 of 1178 REJ09B0403 0100...
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Страница 804: ...Section 19 LPC Interface LPC Rev 1 00 Mar 12 2008 Page 756 of 1178 REJ09B0403 0100...
Страница 838: ...Section 20 Ethernet Controller EtherC Rev 1 00 Mar 12 2008 Page 790 of 1178 REJ09B0403 0100...
Страница 964: ...Section 24 RAM Rev 1 00 Mar 12 2008 Page 916 of 1178 REJ09B0403 0100...
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Страница 1098: ...Section 26 Boundary Scan JTAG Rev 1 00 Mar 12 2008 Page 1050 of 1178 REJ09B0403 0100...
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