SH7616 Datasheet, PDF (420/935 Pages) Renesas Technology Corp – 32-Bit RISC Microcomputer SuperH™ RISC engine Family/SH7600 Series

Section 9 Ethernet Controller (EtherC)
9.2.13 Carrier Not Detect Counter Register (CNDCR)
Bit: 31
30
29
...
19
18
17
16
—
—
—
...
—
—
—
—
Initial value: 0
0
0
...
0
0
0
0
R/W: R
R
R
...
R
R
R
R
Bit: 15
14
13
12
11
10
9
CNDC15 CNDC14 CNDC13 CNDC12 CNDC11 CNDC10 CNDC9
Initial value: 0
0
0
0
0
0
0
R/W: R/W
R/W
R/W
R/W
R/W
R/W
R/W
8
CNDC8
0
R/W
Bit:
Initial value:
R/W:
7
CNDC7
0
R/W
6
CNDC6
0
R/W
5
CNDC5
0
R/W
4
CNDC4
0
R/W
3
CNDC3
0
R/W
2
CNDC2
0
R/W
1
CNDC1
0
R/W
0
CNDC0
0
R/W
CNDCR is a 16-bit counter that indicates the number of times the carrier could not be detected
while the preamble was being sent. When the value in this register reaches H'FFFF (65,535), the
count is halted. The counter value is cleared to 0 by a write to this register (the write value is
immaterial).
Bits 31 to 16—Reserved: These bits are always read as 0. The write value should always be 0.
Bits 15 to 0—Carrier Not Detect Count 15 to 0 (CNDC15 to CNDC0): These bits indicate the
number of times the carrier was not detected.
Rev. 2.00 Mar 09, 2006 page 394 of 906
REJ09B0292-0200