SH7670 Datasheet, PDF (428/1292 Pages) Renesas Technology Corp – 32-Bit RISC Microcomputer SuperHTM RISC engine Family / SH7670 Series

Section 12 Ethernet Controller (EtherC)
Initial
Bit
Bit Name Value R/W
6
RE
0
R/W
5
TE
0
R/W
4

0
R
3
ILB
0
R/W
2
ELB
0
R/W
1
DM
0
R/W
Description
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
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.
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.
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
Duplex Mode
Specifies the EtherC transfer method.
0: Half-duplex transfer is specified
1: Full-duplex transfer is specified
Rev. 1.00 Nov. 14, 2007 Page 402 of 1262
REJ09B0437-0100