D63711 NEC, D63711 Datasheet - Page 57

• Manufacturer Part Number: D63711
• Description: Search -----> UPD63711
• Manufacturer: NEC

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3.5 Status
[Functional description]
PW:
FR:
PSW:
CC:
MSB
The status flags can be used to find out the internal state of the LSI.
–
This is the maximum value of the inversion interval of the EFM signal detected during the RFCK period
(peak hold) compared to 188T (approximately 43.5 s). This flag is used to check whether or not rotation
stopped when a brake was applied to the spindle for stopping the rotation of a disc. To avoid detection of
errors due to defect (etc.), judge rotation to have stopped as long as PW = 1 multiple times in succession.
Depending on the state of the EFM signal, PW may remain equal to 0 if the focus servo is out of position,
so in addition to checking the PW flag, also check the focus servo state.
In the EFM demodulation block, whether the output of the internal frame counter matches with the frame
synchronization signal is sampled every WFCK/16 and a signal indicating a match or a non-match is output.
If this signal indicates non-match 8 times in succession, this is regarded as an asynchronized state (FR =
0). At times other than this, it is regarded as a synchronized state (FR = 1).
This flag is used to detect the mirror state of a disc and can be used in a sled servo or spindle servo guard.
In addition, CLV adaptive servo mode switches the lead-in servo and normal servo according to this flag.
Outputs the state of the LIMIT pin (pin 39).
When CC = 1, the processing of a command input from a microcontroller is being performed. The period in
which CC = 1 is at most 12 s (peak level data readout time).
CC
PSW
–
Status
FR
Preliminary Product Information S14470EJ1V1PM00
–
PW
LSB
–
PSW
PW
FR
CC
0
1
0
1
0
1
Maximum interval between EFM signal
transition points < 188T
Maximum interval between EFM signal
transition points
Asynchronized state
Synchronized state
Command execution finished
Command execution in progress
Detection of Maximum Interval between EFM
Synchronization Detection State
Command Execution State
T = bit rate = approximately 231.4 ns
Signal Transition Points
Pick Inner Detection
188T
PD63711
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