Rev. 1.0, 02/00, page 652 of 1141
Capstan Phase Error Data Registers (CPER1, CPER2)
0
0
1
0
R*/W
2
0
R*/W
3
0
4
1
5
1
6
1
7
—
—
—
—
—
—
—
—
R*/W
R*/W
1
Bit :
Initial value :
R/W :
CPER19
CPER18
CPER17
CPER16
8
0
9
0
R*/W
10
0
R*/W
11
CPER8
CPER9
CPER10
CPER11
0
12
0
13
0
14
0
15
CPER12
CPER13
CPER14
CPER15
R*/W
R*/W
R*/W
R*/W
R*/W
R*/W
0
Bit :
Initial value :
R/W :
Note: Note that only detected error data can be read.
0
0
1
0
R*/W
2
0
R*/W
3
CPER0
CPER1
CPER2
CPER3
0
4
0
5
0
6
0
7
CPER4
CPER5
CPER6
CPER7
R*/W
R*/W
R*/W
R*/W
R*/W
R*/W
0
Bit :
Initial value :
R/W :
CPER1 and CPER2 constitute a 20-bit capstan phase error data register. The 20 bits are weighted
as follows: bit 3 of CPER1 is the MSB. Bit 0 of CPER2 is the LSB. When the rotational phase is
correct, the data H'00000 is latched. Negative data will be latched if the phase leads the correct
phase, and positive data if it lags. Values in CPER1 and CPER 2 are transferred to the digital
filter circuit.
CPER1 and CPER are 20-bit read/write registers. When writing data to CPER 1 and CPER2,
write to CPER1 first, and then write to CPER2. Only a word access is valid. If a byte access is
attempted, correct operation is not guaranteed. CPER1 and CPER2 are initialized to H'F0 and
H'0000 by a reset, and in standby mode.
See the note on the capstan phase preset data registers (CPPR1 and CPPR2) in section 26.9.4.