S5L9250B
DATA SHEET
Block Description
• Analog (A/D) interface block:
This block receives servo errors such as focus and tracking errors, and carries out input gain control
functions such as A/D conversion in order to heighten the rate of ADC deconstruction. It also has a TZC, a
MIRR comparator feature, a VREF generating feature, and a built-in 8ch dividing MUX.
• Timing generator:
The timing generator generates various timings used within the servo utilizing the external crystal
33.8688MHz. It also uses the built-in PLL's 40MHz as the basic signal for timing generation.
• I/O interface block:
This block accepts externally generated signals such as lock and SSTOP, and outputs internally generated
signals. It outputs various monitor signals such as ATSC and FOKB.
• RF interface block:
This block transmits various automatic adjustment outputs and data needed by the RF, such as
focus/tracking offset, TBAL output, AGC output, LD on/off, MICOM data, etc.
• MICOM interface block:
This block relays data between MICOM and 8-bit parallel.
• Track counter:
The track counter has a built-in 16-bit up/down counter to act as an accurate counter during jump.
It is 16-bit, allowing for full stroke counting.
• DA converter block:
This block uses a 10-bit DAC (R-string) to control the focus/tracking/sled0/sled1 at high resolution.
• Spindle PWM output:
This output is a 1-channel PWM output for spindle control (possible with sled)
• ROM:
This ROM is a servo program ROM with a built-in servo control program.
• DSP core for digital servo:
This block is central to the servo. It digitally handles various emergencies such as focus/tracking loop filter
handling, tracking jump, and sled move.
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