Philips DVD963SA Sacd DSD processor, Basic Engine Interface, Audio data input/output Interface

EN 80 9. DVD963SA Circuit Descriptions and List of Abbreviations

Input

Input data comes from the I2S-bus. The front-end interface of this device, accepts DVD, CD and CD-DA information.

Signal Processing

For video, the input data stream is decoded to the appropriate MPEG, Sub Picture, and OSD data streams, after which they

Block diagram

To Host processor

				(STi 55XX)
3		1			4
						Register
				Host interface		Host
HF	AGC		8 bits			interface
			AD

From Host processor (STi 55XX)

PCM IEC 958

PCM_CLK

DSD_CLK

are fed to the PAL/NTSC encoder. This cell will convert the digital MPEG/Sub Picture/OSD stream into a standard base band signal and into RGB components. It handles interlaced and non-interlaced data, can perform CC/TXT encoding, and allows MacroVision copy protection.

For audio, the processing cell is a fully compatible DTS, Dolby Digital (AC-3), MPEG1, MPEG2, PCM decoder, capable of decoding 5.1 and 2 channel streams.

(BE Interface)

I2S

				2
		PSP-key					Memory
							manager
		decoder
Key				Control
	Decryption					PI-bus
	/
			Sector
		Processor					Demux
			PI-Bus
			Control
							SACD
							Audio
							interface
					SDRAM
					interface

IEC 958

gen.

DSD -->PCM (stereo)

	DSD
	mix
2 -5 -6 ch	6 channel
LossLess
	fade
decoder

IEC 958

I2S

PCM

DSD/PCM

MUTE

Output

For video, six analogue output pins are available on which CVBS, S-VHS (Y/C), and RGB signals are present. They go,

to 16 Mbit/64 Mbit	AUD_CLK	SYS_CLK
SDRAM	256/384/512/718*FS	27-35 MHz
	FS = 44.1 - 48 KHz

CL 26532053_021.eps 260402

via a buffer, to connector 1703. As an option, a digital YUV output is available at connector 1704.

External Memory

The STi55xx family is capable of accessing external memory via three buses:

•The enhanced memory interface (EMI). This interface is configurable and can be used to access Flash, ROM, and various flavours of DRAM.

•The shared memory interface (SMI). The SMI is only used to access SDRAM. The SMI is connected to a 64Mbits (4M x 16bit) 7.5ns SDRAM (item 7500). The SDRAM has the following functions:

–It is used by the MPEG video decoder as a frame buffer,

–It holds the software and the variables used by it.

•The I2C bus. Via this bus, the NVRAM (or EEPROM) is accessible. This memory is used to store user settings, player settings, and region code. As the STi55xx I/O-lines are potentially unable handle 5V inputs, a voltage level shifter is foreseen for all I2C-busses. This circuit will isolate the STi55xx I2C ports (3.3V) from the system I2C bus (5V). See figure below.

5V 3V3

3k3 3k3 (optional)

5V I2C levels 3.3V I2C levels

CL 16532163_050.eps 230102

Figure 9-5 I2C voltage level shifter

The SACD DSD processor

The Furore-IC is a one-chip design, containing all the hardware that is required for SACD processing. It is intended to interface with the STixx-family DVD video decoders.

The Furore-IC contains a memory interface to support an external 16 or 64 Mbit SDRAM.

During SACD application, the STi55xx serves as a host, whereby the Furore is controlled via the EMI interface. The Furore processing part is not used during all other play modes. In these modes, the PCM audio signals are fed through the Furore to the appropriate DAC.

Figure 9-6 Block diagram Furore

We can divide the Furore-IC in four main parts (see block diagram):

1.Host interface. This is the link between the host bus and the internal registers and memory bus. It also supplies the general reset signal (HW and SW) and the interrupt signals.

2.Data processing. All modules and peripherals in this part are connected to a so-called PI-bus. It is beyond the scope of this manual to go more in detail on this subject.

3.Copy protection. On every SACD disc, a PSP-signal is recorded. The player can only play a disc if a valid PSP- signal is detected. This PSP-key is recorded, via a special mechanism, in the EFM-signal on the disc. To detect this key, the analogue HF-signal from the optical pick-up unit is fed directly to the Furore-IC. Via an AGC, the signal is fed to an ADC. The digitised HF signal is then fed to a block where key is encrypted. Control of this process is done via the host interface (sector processor).

4.DSD decoding and post processing. In this part, all processing is done to generate a DSD and/or an I2S stream (from the de-multiplexed stream coming from the data processing block), in such a way that it can directly be connected to a DA-converter. All processing is done on 384*FS.

Interfaces

•Basic Engine Interface:

–Data input interface. The Basic Engine Interface (I2S) is connected to the output of the SAA7335 (HD61) high speed CD decoder.

–Analogue HF input. The analogue HF input, coming from the optical pickup unit (OPU), is also fed to the Furore-IC, to extract the copy-protection information PSP (Pit Signal Processing = invisible data is stored on to disc, which is required to decrypt the encrypted content).

•SDRAM Interface: The SDRAM interface forms a glue less interface to one 64 Mbit SDRAM device. The interface takes care for the power-up sequence, mode programming and refreshing of the SDRAM devices. This is hard coded in the interface and does not have to be controlled by the host.

•Audio data input/output Interface:

–DSD/PCM combined data output. DSD_PCM: Output intended for a combined 6-channel DSD (SACD) and PCM (DVD-CDDA) DAC. Switching between the PCM data coming from the STi55xx, and the internal generated DSD signals, is done in the Furore IC.

–Stereo DSD only output. DSD_stereo: 2-channel DSD output with stereo down mix in the case of 5- and 6- channel, and normal stereo in case of 2-channel DSD mode.