Section 23 Gigabit Ethernet Controller (GETHER)
Rev. 1.00 Oct. 01, 2007 Page 946 of 1956
REJ09B0256-0100
frame can be stored in buffer 1 (set RBL to 14 bytes) and the remaining data can be stored in
buffer 2 (set RBL to 1500 bytes). All receive frames, of course, can be stored in a single buffer if
multiple descriptors are prepared and RBL of each descriptor is set to more than 1514 bytes
(maximum Ethernet frame length).
Valid transmit data
Transmit buffer
Receive deschriptor
Reserved
RBL
RD0
RD1
RD2
RBA
Padding (4/20/52 bytes)
*
TFS[26:0]
P
V
R
D
L
E
R
A
C
T
31
16
15
25
26
27
29 28
30
31
12
11
0
0
31
0
R
F
E
R
F
P
Note:
*
According to the descripotr lenght set by the DL0 and DL 1 bits in EDMR, the padding size is detemined as follows
:
For 16 bytes Padding = 4 bytes
For 32 bytes padding = 20bytes
For 64 bytes Padding = 52bytes
Figure 23.4 Relationship between Receive Descriptor and Receive Buffer
(a) Receive Descriptor 0 (RD0)
The user sets whether the bits of the descriptor are valid or invalid and whether the descriptor
represents the end of the descriptor list in RD0 before the RR bit in EDRRR is set to 1 and the
start of a read by the E-DMAC. After receive DMA transfer of an Ethernet frame by the E-
DMAC, the E-DMAC disables the valid/invalid bits of the descriptor and writes status
information. This operation is referred to as write-back.
When using RD0, the user should write desired values to bits 31 and 30 according to the
descriptor configuration. Bits 29 to 0 should be cleared to 0.
Содержание SH7763
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Страница 144: ...Section 3 Instruction Set Rev 1 00 Oct 01 2007 Page 78 of 1956 REJ09B0256 0100 ...
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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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