Reception - Renesas H8S Family Hardware Manual

Reception

The EtherC receiver separates the frame data (MII into preamble, SFD, DA (destination address),

SA (Source address), type/length, Data, and CRC data) and outputs DA, SA, type/length, Data to

the E-DMAC. Figure 20.3 shows the state transitions of the EtherC receiver.

Illegal carrier

SFD: Start frame delimiter

Note: * The error frame also transmits data to the buffer.

1. When the receive enable (RE) bit is set, the receiver enters the receive idle state.

2. When an SFD (start frame delimiter) is detected after a receive packet preamble, the receiver

starts receive processing. Discards a frame with an invalid pattern.

3. In normal mode, if the destination address matches the receiver's own address, or if broadcast

or multicast transmission or promiscuous mode is specified, the receiver starts data reception.

Promiscuous and other

station destination address

notification*

Normal reception

Figure 20.3 EtherC Receiver State Transmissions

Section 20 Ethernet Controller (EtherC)

RX-DV negation

Start of frame

Destination address

Receive error

Receive error

Rev. 1.00 Mar. 12, 2008 Page 779 of 1178

Wait for SFD

Own destination address

or broadcast

or multicast

or promiscuous

REJ09B0403-0100