LC78631 データシートの表示（PDF） - SANYO -> Panasonic
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LC78631 Datasheet PDF : 34 Pages
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LC78631E
— Braking period (c)
This period ends when the WRQ signal rises, i.e. at the point subcodes can be read. If WRQ does not go high,
the period is terminated if 60 ms elapse.
Note: Since sled forwarding is not performed, a sled forwarding operation is necessary for large track jumps.
Arbitrary track jump mode is initialized by the following 2-byte command.
DATA BYTE + $48
ARBITRARY TRACK JUMP MODE SET COMMAND
The lower 6 bits of the data byte set the track jump acceleration period (a) and the track jump deceleration period
(b). The period a is calculated from the given n and rounded to an integer. The LC78631E monitors the TES half
period and terminates the b period if a period longer than the set period elapses.
d5
d4
Track jump acceleration period
0
0 (8/16) × n tracks
0
1 (9/16) × n tracks
1
0 (10/16) × n tracks
d3
d2
d1
d0
0
0
0
0
0
0
0
1
0
0
1
0
0
1
0
0
1
0
0
0
TES half period
306 µs*
17 µs
32 µs
62 µs
123 µs
The TES half period for b period termination is ≈ (123 × d3) + (62 × d2) + (32 × d1) + (17 × d0) µs
Note: * The maximum value (306 µs) is set when [d3 d2 d1 d0] = [0 0 0 0].
• Track check mode
Code
$F0
$F8
$FF
Command
TRACK CHECK IN
TRACK CHECK OUT
TRACK CHECK CLEAR
RES = low
q
The LC78631E will count the specified number of tracks when the microprocessor sends an arbitrary binary value
in the range 8 to 254 and either a track check in or a track check out 2-byte command.
No. 5342-17/34
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