Sony DVP S530D Bedienungsanleitung PDF herunterladen (Seite 46)

Initial Sled Motor Drive

Initial Sled Movement

Start

When the laser’s platform is lifted to a level position, the disc is sand-

wiched between the spindle motor table and the magnet. In this position

the disc is said to be “chucked”. The chucked position requires System

Control IC202 to retrieve the initial sled program stored in EEProm memory

IC201 (not shown) via the parallel bus.

Movement

The program in IC201 instructs the sled motor to move the laser to home

position then quickly outward, but the sled does not stop. It just slows

down while the laser and focus search is activated. If a disc is found, the

sled stops and playback begins. However, if no disc is found, the sled

speeds up and moves outward again further into the disc area. As it

slows down a second time, the laser and focus system is instructed to

look for a disc (specifically its information layer). If it fails to find it, the sled

is quickly moved outward the last time for the third search. The “no disc

found” cycle concludes when the sled motor is reversed and the laser

assembly is driven home.

ICs Used

System Control IC202 controls the sled motor during this initial disc search

stage. A series of ICs are used for this control:

· System Control IC202 uses HGA IC601 as an expansion port

· HGA IC601 instructs Servo DSP IC701

· Servo DSP IC701 issues analog commands to Driver IC802

· Sled Driver IC802 sends voltages to the stepper sled motor

System Control IC202 uses HGA IC601

System Control IC202 plans out the DVD operations, but turns the details

of each operation over to a partner IC. It is much like a manager who

starts many projects, but has the details of each project finished by a

subordinate. When there are too many projects, the manager needs help

from an assistant manager to help oversee the activity. System Controls

IC202 employs expansion port Hybrid Gate Array (HGA) IC601 for assis-

tance in managing the remaining ICs.

IC202 to IC601 Communications

When IC202 wants to send data to IC601, IC202 must also send chip

select, clock, write pulses and address information to support the data.

IC202 to IC601 Communications Signals

Signal Active Signal Present When:

Chip Select

(

CS1 or CS4

from IC202/pins 10 or 7))

Low IC202 & IC205 gets Vcc

Clock IC202/pin 5 Low IC202 gets B+

Write IC202/pin 22 Low IC202 & IC205 gets Vcc

Six Address lines HA 0-5 IC202 gets B+

16 Data lines HD 0-15 IC202 gets B+

IC601 to IC202 Communications

When IC601 wants to send reply data to IC202, an interrupt signal is sent

to IC202. When IC202 is ready, it will send chip select, clock, read pulses,

and address to support the data received from IC601.

IC601 to IC202 Communications

Signal Active Signal Present When:

Interrupt (INT1 or INT3) Low

An operation is completed

(e.g. sled moved)

Chip Select (CS1 or CS4) Low IC202 & IC205 gets Vcc

Clock IC202/pin 5 Low IC202 gets B+

Read IC202/pin 24 Low IC202 & IC205 gets Vcc

Six Address lines HA 0-5 IC202 gets B+

16 Data lines HD 0-15 IC202 gets B+

HGA IC601 Instructs Servo DSP IC701

IC601 controls many ICs. One of them is Servo DSP IC701. Communi-

cations between these ICs use four control lines to transfer the address

and data on the parallel bus:

1 2 ... 41 42 43 44 45 46 47 48 49 50 51 ... 91 92

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