Section 23 Gigabit Ethernet Controller (GETHER)
Rev. 1.00 Oct. 01, 2007 Page 952 of 1956
REJ09B0256-0100
(3) Descriptor and Transmit/Receive Buffer
(a) Transmission
Each transmit descriptor specifies one transmit buffer. The E-DMAC transfers a transmit frame
stored in a transmit buffer specified by a transmit descriptor to the transmit FIFO. Multiple
transmit frames stored in transmit buffers specified by multiple descriptors can be connected into
one transmit frame and transferred to the transmit FIFO.
Figure 23.5 shows the relationship between the transmit descriptors and transmit buffers.
4 bytes
Tfansmit buffer
(in memory)
Tfansmit descriptor ring
(in memory)
TACT
TDL
TFP[1:0]
Transmit buffer 1
Transmit descriptor 1
(Transmit frame A)
Transmit descriptor 2
(Transmit frame B)
Transmit descriptor 3
(Transmit frame B)
Transmit descriptor 4
(Transmit frame B)
Transmit descriptor 5
(Transmit frame C)
Transmit descriptor 6
(Transmit frame C)
Transmit descriptor 7
(Transmit frame D)
Transmit descriptor 8
(Transmit frame E)
Transmit buffer 1
Transmit frame A
Transmit frame B
Transimit buffer 2
Transimit buffer 2
Transmit buffer 4
Transmit buffer 4
Transmit buffer 5
Transmit buffer 6
Transmit buffer 8
Transmit buffer 7
Transmit buffer 8
Transmit buffer 3
Transmit buffer 3
Transmit buffer 6
Transmit buffer 5
Transmit buffer 2 to 4 are connected to be one frame
(transmit frame B) and output to the GMII/MII/RMII.
(Transmit data transferred by DMA transfer from
memory to transmit FIFO is configured as a frame
in the MAC and output to the GMII/MII/RMII.)
Transmit frame data
Transmit buffer 5 and 6 are connented to be one frame.
(transmit frame C) arnd output to the GMII/MII/RMII.
Transmit frame C
Transmit frame D
Transmit frame E
Transimit buffer 7
1
1
1 0
0
0
1 0
1
0
1 0
0
1
1 0
1
0
1 0
1
1
1 0
1
1
1 1
0
1
1 0
Figure 23.5 Relationship between Transmit Descriptor and Transmit Buffer
(b) Reception
Each receive descriptor specifies one receive buffer. The E-DMAC receives a receive frame from
the receive FIFO and stores it in a receive buffer specified by a receive descriptor. If the receive
frame size exceeds the receive buffer size, the remaining data of the receive frame can be stored in
Содержание SH7763
Страница 2: ...Rev 1 00 Oct 01 2007 Page ii of lxvi ...
Страница 122: ...Section 2 Programming Model Rev 1 00 Oct 01 2007 Page 56 of 1956 REJ09B0256 0100 ...
Страница 144: ...Section 3 Instruction Set Rev 1 00 Oct 01 2007 Page 78 of 1956 REJ09B0256 0100 ...
Страница 170: ...Section 4 Pipelining Rev 1 00 Oct 01 2007 Page 104 of 1956 REJ09B0256 0100 ...
Страница 282: ...Section 7 Caches Rev 1 00 Oct 01 2007 Page 216 of 1956 REJ09B0256 0100 ...
Страница 378: ...Section 9 Interrupt Controller INTC Rev 1 00 Oct 01 2007 Page 312 of 1956 REJ09B0256 0100 ...
Страница 514: ...Section 12 DDR SDRAM Interface DDRIF Rev 1 00 Oct 01 2007 Page 448 of 1956 REJ09B0256 0100 ...
Страница 630: ...Section 13 PCI Controller PCIC Rev 1 00 Oct 01 2007 Page 564 of 1956 REJ09B0256 0100 ...
Страница 686: ...Section 14 Direct Memory Access Controller DMAC Rev 1 00 Oct 01 2007 Page 620 of 1956 REJ09B0256 0100 ...
Страница 710: ...Section 16 Clock Pulse Generator CPG Rev 1 00 Oct 01 2007 Page 644 of 1956 REJ09B0256 0100 ...
Страница 732: ...Section 17 Watchdog Timer and Reset WDT Rev 1 00 Oct 01 2007 Page 666 of 1956 REJ09B0256 0100 ...
Страница 752: ...Section 18 Power Down Mode Rev 1 00 Oct 01 2007 Page 686 of 1956 REJ09B0256 0100 ...
Страница 772: ...Section 19 Timer Unit TMU Rev 1 00 Oct 01 2007 Page 706 of 1956 REJ09B0256 0100 ...
Страница 824: ...Section 21 Compare Match Timer CMT Rev 1 00 Oct 01 2007 Page 758 of 1956 REJ09B0256 0100 ...
Страница 1060: ...Section 23 Gigabit Ethernet Controller GETHER Rev 1 00 Oct 01 2007 Page 994 of 1956 REJ09B0256 0100 ...
Страница 1062: ...Section 24 IP Security Accelerator SECURITY Rev 1 00 Oct 01 2007 Page 996 of 1956 REJ09B0256 0100 ...
Страница 1124: ...Section 26 I 2 C Bus Interface IIC Rev 1 00 Oct 01 2007 Page 1058 of 1956 REJ09B0256 0100 ...
Страница 1184: ...Section 27 Serial Communication Interface with FIFO SCIF Rev 1 00 Oct 01 2007 Page 1118 of 1956 REJ09B0256 0100 ...
Страница 1350: ...Section 30 SIM Card Module SIM Rev 1 00 Oct 01 2007 Page 1284 of 1956 REJ09B0256 0100 ...
Страница 1484: ...Section 33 Audio Codec Interface HAC Rev 1 00 Oct 01 2007 Page 1418 of 1956 REJ09B0256 0100 ...
Страница 1560: ...Section 35 USB Host Controller USBH Rev 1 00 Oct 01 2007 Page 1494 of 1956 REJ09B0256 0100 ...
Страница 1720: ...Section 37 LCD Controller LCDC Rev 1 00 Oct 01 2007 Page 1654 of 1956 REJ09B0256 0100 ...
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Страница 2026: ...SH7763 Hardware Manual ...