SAA7348GP Datasheet, PDF (26/60 Pages) NXP Semiconductors – All Compact Disc Engine ACE

Philips Semiconductors
All Compact Disc Engine (ACE)
Preliminary specification
SAA7348GP
8.1.3 SERVO CONTROL REGISTER (SCR)
The Servo Control Register is used for reading and writing internal control signals. The register is byte addressable; R/W.
Table 13 Servo control register (address 0XD9H)
7
6
Srv_frc_flock Srv_frc_lock
5
Srv_otd
4
Srv_da
3
Srv_cl
2
Srv_rab
1
Srv_startup
0
Serv_halt
Table 14 Description of SCR bits
BIT
SYMBOL
DESCRIPTION
7
Srv_frc_flock force_flock: coarse PLL lock indicator control; a HIGH indicates ±6% of disc speed
6
Srv_frc_lock force_lock; a HIGH indicates frequency lock
5
Srv_otd OTD controller: off-track signal generated by the controller input for the OTD
multiplexer; a HIGH indicates laser is off track
4
Srv_da DA (used only with direct decoder communication)
3
Srv_cl CL (used only with direct decoder communication)
2
Srv_rab RAB (used only with direct decoder communication)
1
Srv_startup 16 kHz pulse (start new servo processor execution sequence); pulse is latched; latch is
cleared by a write operation
0
Serv_halt servo halt; halts servo processor execution
1997 Jul 11
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