SAA7818HL

General description

The SAA7818HL is a device for 6 x DVD and 18 x CD playback applications.

This device contains an embedded microcontroller which can operate as a 33 MHz or 67 MHz equivalent 80C51 and interfaces to the channel decoder, block decoder and servo processor.

New features enable superior playability in both CD and DVD modes.

The block decoder has an embedded DVD video authentication module and supports up to 64 Mbit of external SDRAM memory. The data can be fed out in a number of different configurations including I²S-bus, ATAPI and UDE. This device also includes the option to bypass the external memory altogether, creating a bufferless ATAPI or UDE data path solution.

The channel decoder has selectable differential and single-ended HF inputs, which are compatible with the TZA1036 and TZA1038 devices. There is an option to output the data as raw I²S-bus via some programmable data I/O pins. With increased tap setting for the PLL equalizer compared with the SAA7816 device and enhanced playability of black dots and scratches, overall playability has been greatly improved. There are also benefits due to a new defect detector that allows holding the HF PLL frequency and slicer settings over a defect. These, together with an additional limit equalizer lead to improved tolerance to continuity errors in DVD playback mode. There are also two extra motor gain settings compared to the SAA7816 device and support for copyright protection strategies in games applications.

The servo processor has been upgraded to include an improved defect detection and handling process, an integrated envelope detection circuit and also DC offset compensation on the diode inputs.

Features

• Host interface:
• Supports ATAPI interface
• Configurable as generic DMA interface; for use with external host interface devices
• Automatic determination of block length for mode 2; form 1 and form 2 sectors; block length transferred is programmable
• Supports synchronous UDE interface
• Supports bufferless mode.
• Block decoder:
• Supports CD-ROM, CDr, CD-DA, VCD, SVCD, CD-I, photo CD and DVD video formats
• Supports real-time error detection and correction in hardware for CD-ROM mode
• CD-ROM error corrector switchable between single or dual pass; both with Error Detection/Correction (EDC)
• Internal registers are memory mapped
• Embedded DVD video authentication module.
• Buffer memory controller:
• Support for up to 64 Mbit external SDRAM memory
• Block based sector addressing.
• Channel decoder:
• Selectable differential and single-ended HF inputs; compatible with the TZA1036 and TZA1038; single-ended input has bypassable AGC
• Internal 8-bit ADC
• Digital PLL and slicer for HF clock regeneration
• Supports EFM and EFM+ demodulation
• Full CD error correction strategy; t = 2 and e = 4
• On-chip CD error corrector memory with +-8 frame jitter margin
• Built-in hardware for double pass DVD error corrector; can correct 5 errors in C1 frame; 16 errors in C2 frame
• Error corrector monitor signal available
• I²S-bus output available via programmable vampire pins
• Programmable frame sync loss indication
• Increased tap settings for PLL equalizer compared with SAA7816
• Enhanced playability of black dots and scratches with improved defect detector; it enables the HF PLL frequency, slicer, high-pass filter, AGC and offset loops to be held when a defect is detected
• Improved tolerance to continuity errors in DVD play mode
• Limit equalizer
• Two extra motor gain settings compared to SAA7816
• Support for copyright protection strategy for games applications
• Hardware AGC loop, in combination with front-end IC (TZA1038)
• Hardware automatic offset compensation loop, in combination with front-end IC (TZA1038)
• Average jitter can be read back
• Internal digital high-pass filter on HF input, with programmable cut-off frequencies
• Run Length 3 (RL3) pushback feature
• PLL monitor signal available
• Interpolate and hold on audio output.
• Spindle motor control:
• Advanced motor control loop allows CAV, CLV and pseudo-CLV playback
• Support for 3-pin and 1-pin tacho control
• Motor control via incoming bitstream or tacho.
• Speed operation:
• Supports 18 x CD-ROM playback
• Supports 6 x DVD-ROM playback.
• Multimedia functions:
• Supports audio playback via DRAM buffer; allows audio discs to be played at higher speeds
• IEC 60958 (SPDIF, AES/EBU and DOBM) output with Q-W subcode and programmable category code; output at n = 1 rate
• Audio output via I²S-bus vampire interface: 4 x oversampling filter, digital volume control, attenuator and mute.
• Microcontroller interface:
• Embedded microcontroller can operate as 33 MHz or 67 MHz equivalent 80C51
• Embedded co-processor for fast multiply, divide, shift and normalize instructions; supported by C-compilers
• Co-processor for MSF calculations
• Memory mapped interfaces to sub functions
• External microcontroller support
• Embedded SRAM: 1.5 kbytes Xdata, 512 bytes Idata, 224 bytes data and registers
• 4 banks; on Idata and registers, for better multi-tasking support
• External flash EPROM programming support: serial boot possible with empty flash EPROM and internal program upload support
• Code space support up to 1 Mbyte through built-in bank switching
• Debug interface for embedded microcontroller.
• Servo processor:
• Switched current Analog-to-Digital Converters (ADCs) for diode and error signal inputs
• Selectable servo error or servo diode inputs
• Focus and radial servo loops
• Automatic closed-loop gain control available for focus and radial loops
• Built-in access procedure with fast track count input
• High-speed track crossing velocity measurement (> 350 kHz) for CD and DVD
• Special DVD track crossing support
• Fast radial brake circuitry
• Eight-to-Fourteen Modulation (EFM) actuator damping circuitry
• Sledge motor servo loop with enhanced PCS support
• Sledge stepper motor support
• Adaptive Repetitive Control (ARC)
• Debug interface for servo
• DC offset compensation for servo
• White and black dot defect detection and handling
• Integrated envelope detection.
• Clock multiplier:
• On-chip clock multipliers allows the use of 8.4672 MHz crystal.

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