LC7861KE 查看數據表（PDF） - SANYO -> Panasonic

零件编号

产品描述 (功能)

生产厂家

LC7861KE

Digital Signal Processor for Compact Disc Players

SANYO -> Panasonic 

LC7861KE

10. Track jump circuit; Pin 16: HFL, pin 17: TES, pin 20: TOFF, pin 21: TGL, pin 22: THLD, pin 25: JP+, pin 26: JP–

MSB

LSB

10100000

10100001

10001100

00001111

10001111

00010001

00010010

00110001

00010011

00010100

00110000

00010101

00010111

00011001

00011010

00111001

00011011

00011100

00111000

00011101

00011111

00010110

Command

TRACK JUMP (earlier version)

TRACK JUMP (new command)

TRACK JUMP BRAKE

TOFF

TON

1 TRACK JUMP IN #1

1 TRACK JUMP IN #2

1 TRACK JUMP IN #3

4 TRACK JUMP IN

16 TRACK JUMP IN

32 TRACK JUMP IN

64 TRACK JUMP IN

128 TRACK JUMP IN

1 TRACK JUMP OUT #1

1 TRACK JUMP OUT #2

1 TRACK JUMP OUT #3

4 TRACK JUMP OUT

16 TRACK JUMP OUT

32 TRACK JUMP OUT

64 TRACK JUMP OUT

128 TRACK JUMP OUT

256 TRACK CHECK

RES = low

o

o

When the LC7861KE receives a track jump instruction as a servo command, it first generates accelerating pulses

(period a) and next generates deceleration pulses (period b). The passage of the braking period (period c) completes

the specified jump. During the braking period, the LC7861KE detects the beam slip direction from the TES and HFL

inputs. TOFF is used to cut the components in the TE signal that aggravate slip. The jump destination track is

captured by increasing the servo gain with TGL. In all the disk motor control operations, the TOFF pin only goes low

during CLV mode, and will be high during the start, stop, and brake operations. Note that the TOFF pin can be

turned on and off independently by microprocessor issued commands. However, this function is only valid when disk

motor control is in CLV mode. The table lists the relationships between accelerating pulses, deceleration pulses and

the braking period.

No. 4818-11/18

Share Link: