r5s77631ay266bgv Renesas Electronics Corporation., r5s77631ay266bgv Datasheet - Page 1058

Manufacturer Part Number

r5s77631ay266bgv

Renesas 32-bit Risc Microcomputer Superhtm Risc Engine Family Sh-4a Series

Manufacturer

Renesas Electronics Corporation.

Section 23 Gigabit Ethernet Controller (GETHER)

Waveforms received from the RMII interface are converted to MII waveforms and output (10

Mbps or 100 Mbps). Illegal carrier detection signal received from the RMII interface is converted

to MII signal and output. RMII_RX-ER signal received from the RMII interface is converted to

MII interface signal and output.

Note: Illegal carrier detection is not generated from preamble detection to reception completion

Transmit waveforms from the MII interface is converted to the RMII interface waveforms and

output (10 Mbps or 100 Mbps). The collision signal, ET_COL, is generated by AND operation of

the ET_CRS and ET_TX-EN signals.

In full-duplex transfer mode, the assertion of the COL is suppressed. Figure 23.37 shows a

schematic of the conversion cicuit.

Rev. 1.00 Oct. 01, 2007 Page 992 of 1956

REJ09B0256-0100

Transmission

Full-Duplex/Half-Duplex Selection

(ET_RX_DV negation).

Figure 23.37 MII-RMll Conversion Circuit

MII-RMII conversion

Half-duplex/full-duplex

2 bit-to-4 bit

False carrier

4 bit-to-2 bit