SH7672 datasheet(428/1292 Pages) RENESAS

428 / 1292 page

Section 12 Ethernet Controller (EtherC)

Rev. 1.00 Nov. 14, 2007 Page 402 of 1262

REJ09B0437-0100

Bit

Bit Name

Initial

Value

R/W

Description

R/W

Reception Enable

If a frame is being received when this bit is switched

from receive function enabled (RE = 1) to disabled (RE

= 0), the receive function will be enabled until reception

of the corresponding frame is completed.

0: Receive function is disabled

1: Receive function is enabled

R/W

Transmission Enable

If a frame is being transmitted when this bit is switched

from transmit function enabled (TE = 1) to disabled (TE

= 0), the transmit function will be enabled until

transmission of the corresponding frame is completed.

0: Transmit function is disabled

1: Transmit function is enabled



Reserved

This bit is always read as 0. The write value should

always be 0.

ILB

R/W

Internal Loop Back Mode

Specifies loopback mode in the EtherC.

0: Normal data transmission/reception is performed.

1: When DM = 1, data loopback is performed inside

the MAC in the EtherC.

ELB

R/W

External Loop Back Mode

This bit value is output directly to this LSI’s general-

purpose external output pin (EXOUT). This bit is used

for loopback mode directives, etc., in the LSI, using the

EXOUT pin. In order for LSI loopback to be

implemented using this function, the LSI must have a

pin corresponding to the EXOUT pin.

0: Low-level output from the EXOUT pin

1: High-level output from the EXOUT pin

R/W

Duplex Mode

Specifies the EtherC transfer method.

0: Half-duplex transfer is specified

1: Full-duplex transfer is specified

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