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.
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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