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SAA7377 Datasheet(PDF) 18 Page - NXP Semiconductors |
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SAA7377 Datasheet(HTML) 18 Page - NXP Semiconductors |
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18 / 56 page  1998 Jul 06 18 Philips Semiconductors Product specifications Digital servo processor and Compact Disc decoder (CD7) SAA7377 7.10 KILL circuit The KILL circuit detects digital silence by testing for an all-zero or all-ones data word in the left or right channel before the digital filter. The output is switched active LOW when silence has been detected for at least 250 ms, or if mute is active. Two modes are available which can be selected by register C: 1 pin kill: KILL active LOW indicates silence detected on both left and right channels. 2 pin kill: KILL active LOW indicates silence detected on left channel. V3 active LOW indicates silence detected on right channel. 7.11 The VIA interface The SAA7377 has five pins that can be reconfigured for different applications (see Table 8). Table 8 Pin applications PIN NAME PIN NUMBER TYPE CONTROL REGISTER ADDRESS CONTROL REGISTER DATA FUNCTION V1 62 input 1100 xxx1 external off-track signal input − xxx0 internal off-track signal used, input may be read via decoder status bit; selected via register 2 V2 63 input −− input may be read via decoder status bit; selected via register 2 V3 42 output 1100 xx0x KILL output for right channel − x01x output = 0 − x11x output = 1 V4 41 output 1101 0000 4-line motor drive (using V4 and V5) − xx01 Q-to-W subcode output − xx10 output = 0 − xx11 output = 1 V5 40 output 1101 01xx de-emphasis output (active HIGH) − 10xx output = 0 − 11xx output = 1 7.12 Spindle motor control 7.12.1 MOTOR OUTPUT MODES The spindle motor speed is controlled by a fully integrated digital servo. Address information from the internal ±8 frame FIFO and disc speed information are used to calculate the motor control output signals. Several output modes, selected by register 6, are supported: • Pulse density, 2-line (true complement output), 1 MHz sample frequency • PWM output, 2-line, 22.05 kHz modulation frequency • PWM output, 4-line, 22.05 kHz modulation frequency • CDV motor mode. 7.12.1.1 Pulse density output mode In the pulse density mode the motor output pin (MOTO1) is the pulse density modulated motor output signal. A 50% duty factor corresponds with the motor not actuated, higher duty factors mean acceleration, lower mean braking. In this mode, the MOTO2 signal is the inverse of the MOTO1 signal. Both signals change state only on the edges of a 1 MHz internal clock signal. Possible application diagrams are illustrated in Fig.13. 7.12.1.2 PWM output mode (2-line) In the PWM mode the motor acceleration signal is put in pulse-width modulation form on the MOTO1 output. The motor braking signal is pulse-width modulated on the MOTO2 output. The timing is illustrated in Fig.14. A typical application diagram is illustrated in Fig.15. |
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