Section 23 Gigabit Ethernet Controller (GETHER)
Rev. 1.00 Oct. 01, 2007 Page 961 of 1956
REJ09B0256-0100
(2) Transmission
Error
Processing
(a) Transmission
Abort
If a transmission error is detected during frame transmission from the transmit FIFO to the
GMII/MII/RMII, transmission of the frame data is aborted. At this time, if DMA transfer of the
appropriate frame from the transmit buffer to the transmit FIFO has not been completed, the DMA
transfer is also aborted.
Following a write-back operation to the transmit descriptor related to the transmit frame aborted
by a transmission error, 1 is written to the TABT bit in EESR and an interrupt is issued to the
CPU. The subsequent transmit descriptors will be processed normally.
(b) Transmit FIFO Underflow
If the transmit FIFO is empty (transmit FIFO underflow) during frame transmission from the
transmit FIFO to the GMII/MII/RMII, the E-MAC forcibly aborts transmission of the frame to the
GMII/MII/RMII. At this time, the frame that the E-MAC receives from the E-DMAC is cut off
halfway. Then, the E-MAC performs the following operation:
•
Writes the TFUF bit in EESR to 1 and generates an interrupt to the CPU.
•
Performs a write-back operation to the transmit descriptor corresponding to the transmit frame.
•
Following the write-back operation, writes the TUC bit in EESR and generates an interrupt to
the CPU.
The subsequent transmit descriptors operate normally.
The E-MAC waits to start frame transmission from the transmit FIFO to the GMII/MII/RMII until
the data that was stored in the transmit FIFO exceeds the number of the bytes specified by TFTR.
Through the effective use of TFTR, the transmit FIFO underflow counts can be controlled.
(c)
Transmit Descriptor Empty
When the TFP bits of the descriptor previously processed are set to 00 or 10 and the TACT bit of
the read transmit descriptor is set to 0 (invalid), a transmit descriptor empty state is determined
and 1 is written to the TDE bit in EESR, and then an interrupt is issued to the CPU.
When a transmit descriptor state is empty, start transmission processing after a software reset.
Summary of Contents for SH7763
Page 2: ...Rev 1 00 Oct 01 2007 Page ii of lxvi ...
Page 122: ...Section 2 Programming Model Rev 1 00 Oct 01 2007 Page 56 of 1956 REJ09B0256 0100 ...
Page 144: ...Section 3 Instruction Set Rev 1 00 Oct 01 2007 Page 78 of 1956 REJ09B0256 0100 ...
Page 170: ...Section 4 Pipelining Rev 1 00 Oct 01 2007 Page 104 of 1956 REJ09B0256 0100 ...
Page 282: ...Section 7 Caches Rev 1 00 Oct 01 2007 Page 216 of 1956 REJ09B0256 0100 ...
Page 378: ...Section 9 Interrupt Controller INTC Rev 1 00 Oct 01 2007 Page 312 of 1956 REJ09B0256 0100 ...
Page 514: ...Section 12 DDR SDRAM Interface DDRIF Rev 1 00 Oct 01 2007 Page 448 of 1956 REJ09B0256 0100 ...
Page 630: ...Section 13 PCI Controller PCIC Rev 1 00 Oct 01 2007 Page 564 of 1956 REJ09B0256 0100 ...
Page 710: ...Section 16 Clock Pulse Generator CPG Rev 1 00 Oct 01 2007 Page 644 of 1956 REJ09B0256 0100 ...
Page 732: ...Section 17 Watchdog Timer and Reset WDT Rev 1 00 Oct 01 2007 Page 666 of 1956 REJ09B0256 0100 ...
Page 752: ...Section 18 Power Down Mode Rev 1 00 Oct 01 2007 Page 686 of 1956 REJ09B0256 0100 ...
Page 772: ...Section 19 Timer Unit TMU Rev 1 00 Oct 01 2007 Page 706 of 1956 REJ09B0256 0100 ...
Page 824: ...Section 21 Compare Match Timer CMT Rev 1 00 Oct 01 2007 Page 758 of 1956 REJ09B0256 0100 ...
Page 1124: ...Section 26 I 2 C Bus Interface IIC Rev 1 00 Oct 01 2007 Page 1058 of 1956 REJ09B0256 0100 ...
Page 1350: ...Section 30 SIM Card Module SIM Rev 1 00 Oct 01 2007 Page 1284 of 1956 REJ09B0256 0100 ...
Page 1484: ...Section 33 Audio Codec Interface HAC Rev 1 00 Oct 01 2007 Page 1418 of 1956 REJ09B0256 0100 ...
Page 1560: ...Section 35 USB Host Controller USBH Rev 1 00 Oct 01 2007 Page 1494 of 1956 REJ09B0256 0100 ...
Page 1720: ...Section 37 LCD Controller LCDC Rev 1 00 Oct 01 2007 Page 1654 of 1956 REJ09B0256 0100 ...
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