Section 23 Gigabit Ethernet Controller (GETHER)
Rev. 1.00 Oct. 01, 2007 Page 953 of 1956
REJ09B0256-0100
a different receive buffer specified by a different receive descriptor. Thus, one receive frame can
be stored in multiple receive buffers.
Figure 23.6 shows the relationship between the receive descriptors and receive buffers.
4 bytes
32-bytes
boundary
32-bytes
boundary
32-bytes
boundary
32-bytes
boundary
32-bytes
boundary
32-bytes
boundary
32-bytes
boundary
32-bytes
boundary
32-bytes
boundary
32-bytes
boundary
32-bytes
boundary
Receive buffer
(in memory)
Receive descriptor ring
(in memory)
RACT
RDL
RFP[1:0]
Transmit descriptor 1
(Transmit frame A)
Transmit descriptor 2
(Transmit frame B)
Transmit descriptor 3
(Transmit frame B)
Transmit descriptor 4
(Transmit frame C)
Transmit descriptor 5
(Transmit frame D)
Transmit descriptor 6
(Waiting for a receive frame)
(Waiting for a receive frame)
(Waiting for a receive frame)
Transmit descriptor 7
Transmit descriptor 8
When the receive frame ;ength is not a multiple
of 32 bytes, an undefined value is written.
(Underfined value)
Receive frame A
(29 bytes)
32 bytes of
unused area
Receive frame B
(Former 32 bytes)
Receive frame B
(Former 32 bytes)
(53 bytes)
Padding data
Receive frame C
Receive frame D
(Former 29 bytes)
Padding data
Receive frame D
(Latter 35 bytes)
Receive frame A
64 bytes
63 bytes
29 bytes
53 bytes
(A frame input from the GMII/MII/RMIi is
written to the receive FIFO. Then the frame
is transferred by DMA transfer from the
receive FIFO to the receive buffer in memory.)
Receive frame data
This frame is divided into two descriptor and
stored
Receive frame B
Receive frame C
Receive frame D
When padding data is inserted in the middle
of the receive frame, PRADIR should be set
so that the latter half of data is written from
to the 4-bytes boundary in the receive buffer.
When padding data is inserted at the top of
the receive frame. the receive frame can be
written to arbitrary byte boundary in memory.
1
1
0 0
1
0
0 0
1
1
0 0
1
1
0 0
-
-
1 0
-
-
1 0
-
-
1 1
0
1
0 0
32-bytes
boundary
32-bytes
boundary
32-bytes
boundary
32-bytes
boundary
Figure 23.6 Relationship between Receive Descriptor and Receive Buffer
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 ...