r5s77631ay266bgv Renesas Electronics Corporation., r5s77631ay266bgv Datasheet - Page 905

• Manufacturer Part Number: r5s77631ay266bgv
• Description: Renesas 32-bit Risc Microcomputer Superhtm Risc Engine Family Sh-4a Series
• Manufacturer: Renesas Electronics Corporation.

23.3.27 GETHER Mode Register (GECMR)
GECMR is used to set the operating mode of the GETHER.
Bit
31 to 3
2
1
0
Initial value:
Initial value:
R/W:
R/W:
Bit:
Bit:
Bit Name

SPEED[1]
BSE
SPEED[0]
31
15


R
R
0
0
30
14


R
R
0
0
29
13


R
R
0
0
Initial
Value
All 0
0
0
0
28
12


R
R
0
0
27
11


R/W
R
R/W
R/W
R/W
R
R
0
0
26
10


R
R
0
0
Description
Reserved
These bits are always read as 0. The write value should
always be 0.
Transfer Speed
Sets the transfer speed in combination with the
SPEED[0] bit. Refer to the SPEED[0] bit.
Burst Transfer Enable
0: Burst transfer is not performed
1: Burst transfer is performed when the transfer speed
Transfer Speed
The transfer speed is specified by a combination of the
SPEED[1] and SPEED[0] bits.
SPEED[1:0]
00: 10-Mbps transfer
01: 1-Gbps transfer
10: 100-Mbps transfer
11: Setting prohibited
25

R

R
0
9
0
is 1 Gpbs in half-duplex transfer (DM bit in ECMR =
0).
24

R

R
0
8
0
Section 23 Gigabit Ethernet Controller (GETHER)
23

R

R
0
7
0
Rev. 1.00 Oct. 01, 2007 Page 839 of 1956
22


R
R
0
6
0
21


R
R
0
5
0
20

R

R
0
4
0
19


R
R
0
3
0
SPEED
REJ09B0256-0100
R/W
18
[1]

R
0
2
0
BSE
17

R
0
1
0
SPEED
R/W
16
[0]

R
0
0
0