Section 23 Gigabit Ethernet Controller (GETHER)
Rev. 1.00 Oct. 01, 2007 Page 936 of 1956
REJ09B0256-0100
23.4 Operation
The GETHER consists of the following three function units:
•
DMA transfer controller (E-DMAC):
DMA transfer between the transmit/receive buffer in
the memory and the transmit/receive FIFO
•
MAC controller (E-MAC):
Transmission/reception processing between the
transmit/receive FIFO and the GMII/MII/RMII
•
Transfer Switching Unit (TSU): Transfer processing between port 0 and port 1, and CAM
processing
Using its direct memory access (DMA) function, the E-DMAC performs DMA transfer of frame
data between a user-specified Ethernet frame transmission/reception data storage destination
(accessible memory space: transmit buffer/receive buffer) and the transmit/receive FIFO in the E-
DMAC. The user cannot read and write data from and to the transmit/receive FIFO directly via the
CPU.
To enable the E-DMAC to perform DMA transfer, information (data) including a transmit/receive
data storage address and so forth, referred to as a descriptor, is required. The E-DMAC reads
transmit data from the transmit buffer or writes receive data to the receive buffer according to the
descriptor information. By arranging multiple descriptors as a descriptor row (list) (to be placed in
a readable/writable memory space), multiple Ethernet frames can be transmitted or received
continuously.
The E-DMAC consists of two systems: one for port 0 and the other for port 1, and both operate
independently for transmission and reception.
The E-MAC constructs an Ethernet frame using the data written to the transmit FIFO and
transmits the frame to the GMII/MII/RMII. It also performs a CRC check of an Ethernet frame
received from the GMII/MII/RMII and deconstructs the frame to write to the receive FIFO. The E-
MAC supports three formats MII, GMII and RMII for interface to the PHI-LSI connected
externally to this LSI.
The E-MAC consists of two controllers: E-MAC0 for port 0 and E-MAC1 for port 1, which
correspond to E-DMAC0 and E-DMAC1 respectively.
The TSU performs Ethernet frame data transfer between the E-MAC0 and E-MAC1. The TSU,
which is placed between the E-DMAC and E-MAC, references the CAM entry table to select one
of the following tasks according to the Ethernet frame destination address (DA) input to the E-
MAC.
Содержание SH7763
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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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