SH7670 datasheet(33/1292 Pages) RENESAS

33 / 1292 page

Section 1 Overview

Rev. 1.00 Nov. 14, 2007 Page 7 of 1262

REJ09B0437-0100

Classification

Module/Function Description

Ethernet controller

(EtherC)

• MAC (Media Access Control) function

 Data frame assembly/deassembly (frame format

conforming to IEEE802.3)

 CSMA/CD link management (for collision avoidance

and processing in case of collision)

 CRC processing

 On-chip FIFOs (512 bytes for transmission and

reception each)

 Supports full-duplex data transmission and reception

 Sends and receives short and long packets

• Conforms to the MII (Media Independent Interface)

standard

 Converts an 8-bit data stream from the MAC layer to a

4-bit MII nibble stream

 Station management (STA feature)

 Eighteen TTL-level signals

 Transfer rate: 10 or 100 Mbps

• Magic PacketTM with WOL (Wake On LAN) output

Advanced

communication

DMAC for

Ethernet controller

(E-DMAC)

• Reduces CPU load using the descriptor management

system

• One channel for transfer from the EtherC receive FIFO to

the receive buffer

• One channel for transfer from the transmit buffer to the

EtherC transmit FIFO

• Allows 16-byte burst transfer for efficient use of the

system bus

• Supports single frame and multibuffer

• Calculates receive data checksum

SH7670 Datasheet(PDF) 33 Page - Renesas Technology Corp