SH7615 Datasheet, PDF (416/925 Pages) Renesas Technology Corp – 32-Bit RISC Microcomputer SuperH
RISC engine Family/SH7600 Series

9.1.2 Configuration
Figure 9.1 shows the configuration of the Ethernet controller.
Transmit
controller
MII
Receive
controller
Command status
interface
Figure 9.1 Configuration of Ethernet Controller (EtherC)
Transmit Controller: Transmit data is stored in the transmit FIFO from memory via the transmit
E-DMAC. The transmit controller assembles this data into an Ethernet/IEEE802.3 frame, which it
outputs to the MII. After passing through the MII, the transmit data is sent onto the line by a PHY-
LSI. The main functions of the transmit controller are as follows:
• Frame assembly and transmission
• CRC calculation and provision to frames
• Data retransmission in case of a collision (up to 15 times)
• Compliant with MII in IEEE802.3u standard
• Byte-nibble conversion supporting PHY-LSI speed
Rev. 2.00, 03/05, page 378 of 884