參數(shù)資料
型號: SAA7348GP
廠商: NXP SEMICONDUCTORS
元件分類: 微控制器/微處理器
英文描述: All Compact Disc Engine ACE
中文描述: 8-BIT, MROM, 35 MHz, MICROCONTROLLER, PQFP100
文件頁數(shù): 26/60頁
文件大?。?/td> 205K
代理商: SAA7348GP
1997 Jul 11
26
Philips Semiconductors
Preliminary specification
All Compact Disc Engine (ACE)
SAA7348GP
8.1.3
S
ERVO
C
ONTROL
R
EGISTER
(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)
Table 14
Description of SCR bits
7
6
5
4
3
2
1
0
Srv_frc_flock
Srv_frc_lock
Srv_otd
Srv_da
Srv_cl
Srv_rab
Srv_startup
Serv_halt
BIT
SYMBOL
Srv_frc_flock force_flock: coarse PLL lock indicator control; a HIGH indicates
±
6% of disc speed
Srv_frc_lock
force_lock; a HIGH indicates frequency lock
Srv_otd
OTD controller: off-track signal generated by the controller input for the OTD
multiplexer; a HIGH indicates laser is off track
Srv_da
DA (used only with direct decoder communication)
Srv_cl
CL (used only with direct decoder communication)
Srv_rab
RAB (used only with direct decoder communication)
Srv_startup
16 kHz pulse (start new servo processor execution sequence); pulse is latched; latch is
cleared by a write operation
Serv_halt
servo halt; halts servo processor execution
DESCRIPTION
7
6
5
4
3
2
1
0
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