CXA1992BR
• ATSC
The anti-shock function can be controlled by setting D3 with D6 = 1 and D7 = 1.
This function is disabled with D3 = 1 and enabled with D3 = 0.
At this time, SENS1 outputs ATSC.
Even if ATSC is disabled, ATSC is output to SENS1.
When an anti-shock signal is generated during the enable status, TG1 and TG2 switch to GAIN UP mode.
(In the Block Diagram, TG1 is set to the side and TG2 is OFF. Even if TG1 and TG2 are NORMAL mode,
they switch to GAIN UP mode in conjunction with ATSC.)
When the anti-shock function is not used, Pin 48 (ATSC) should be connected to VC.
• RDFCT2
DFCT2 can be reset by setting D4 with D6 = 1 and D7 = 1.
DFCT2 is reset with D4 = 1.
After a reset, High is held when DFCT1 rises.
During $1X commands, DFCT2 is output from SENS2.
DFCT2 operates even if DFCT is disabled.
Whether or not DFCT rises at the proper timing for the microcomputer can also be confirmed.
• INT
The interruption (scratched disc) countermeasure circuit can be set to operating status by setting D5 with D6
= 1 and D7 = 1.
This circuit is enabled when D5 = 1 and disabled when D5 = 0.
Even if DFCT1 does not rise, this circuit is effective for scratched discs which cause MIRR to rise.
When MIRR rises, the DFCT switch is routed through the low-pass filter.
The interruption countermeasure circuit is forcibly turned OFF regardless of the command when the tracking
gain is increased. (including when the gain is increased by ATSC or LOCK)
Even if DFCT is disabled, the interruption countermeasure circuit operates when INT is enabled.
Parallel direct interface
• LOCK (Sled overrun prevention circuit)
This circuit operates when LOCK is low.
When LOCK is low, the sled is OFF, and TG1 and TG2 are UP (TRACKING GAIN UP).
LOCK
TM2 SW:
SLED ON
side
SLED
TM2 SW:
SLED OFF
side
side
UP
TG1 SW:
TG2 OFF
TRACKING GAIN
NORMAL
TG1 SW:
TG2 ON
side
When LOCK is not used, Pin 19 (LOCK) should be pulled up to VCC with the resistor of approximately 47kΩ.
– 35 –
SONY [ SONY CORPORATION ]
