Philips DVD763SA/021, DVD763SA/001, DVD763SA/051 manual Audio/Video A/V Board, Reset Circuit

Circuit Descriptions and List of Abbreviations DVD763SA 9. EN 73

The SACD DSD/DST decoder Furore 2 uses 1.8V for its core and analogue portion, and 3.3V for its interface. The on-board 1.8V linear regulator LF18ABDT and 3.3V linear LD1117DT33 are used to generate 1.8V and 3.3V power supply respectively. The back-end section mainly uses the 1.8V or 2.5V and 3.3V, which depend on which back-end processor is used. The on- board linear regulators LF25ABDT or LF18ABDT are used to generate the 2.5V (or 1.8V) required by the STi55xx.

The front-end section mainly uses the 5V and 12V. An on- board linear regulator LD1117DT33 can be used to generate the 3.3V required by the front-end. The 12V is used by the motor and servo drivers.

Reset Circuit

9.4	Audio/Video (A/V) Board
	A			S
			1403	1300
				STATUS
				RGB
P50				P50
					SCART
	7431/32/33			Y/C
			AUDIO L / R	L / R
				CVBS
	7420/22/24	7421/23	7425
	1421
			7435	1	2
CVBS					CVBS
			7436/37		VIDEO OUT
Y-IN
				SVHS
C-IN

Low Voltage Detection 4.5V

STi55xx

Power On
Reset	RESETn
Circuit
Delay 1

Furore 2

		7440/41/42	Y	U	V
RGB/YUV
	7220
	CENTER ON
BOARD	7201	7202	7321/23	R
			L			STEREO
					AUDIO
						AUDIO OUT
MONO	1400
		7300	7325/27
FROM
		VIDEO	L	R

Low Voltage Detection 4.5V

RSTN

Power On

Reset

Circuit

Delay 2

CLK_STBCTRL

Clock Factory

RES_P Basic Engine

CL 26532053_018.eps 260402

		FILTER		FRONT
		BUFFER
	7200		CENTER
DCM data
		7301
			7331	SW
		VIDEO	C
DSD data	DAC	FILTER		C / SW
		BUFFER
Control				MULTI CHANNEL
				AUDIO
				OUT
384* FS	7100/01/03
	CLOCK
	GEN.
		7302	7333/35	R
		VIDEO	L
PCM_CLK		FILTER		SURROUND
		BUFFER

Figure 9-10 Block diagram of reset circuit

This reset circuit takes care that booting the different devices on the mono board takes place in the correct order. The correct reset order is:

1.The Power On Reset circuit (delay t1) creates a reset signal 'RESETn' to reset the STi55xx and Furore .

2.In the meantime, the Power On Reset circuit (delay t1) creates a reset signal 'CLK_STBCTRL', which is inverted to 'RESETn', to enable the Clock Factory.

3.Then, the Power On Reset circuit (delay t2) generates a reset signal 'RES_P' to reset the Basic Engine.

4.The STI55xx can now reset the Basic Engine via 'RSTN'.

A MUTE	7604
	OPTICAL
	DIGITAL
5413	AUDIO OUT
	1410
S/P DIF	DIGITAL OUT
	COAXIAL
	CL 26532053_019.eps
	010502

Figure 9-11 Block diagram A/V board

This board is the interface panel between the DVD-player and its peripherals. See also block diagram in Chapter 6.

9.4.1Control

The control of the A/V board is done by the I2C-decoder IC7104 (see table below):

Table 9-2 Control lines overview IC7104

Description	Pin	Hi	Lo
CLK_SEL	12	Internal clock	External clock
DAC_RESET	10	Normal	Reset
CENTER_ON	9	?	?

9.4.2Video

The analogue video signals from the Mono Board are buffered before they are fed to the several output connectors (SCART, Cinch, and SVHS). The video output from the A/V Board is RGB/YUV, YC, and CVBS.

9.4.3Audio

The digital audio signals are fed to a 6-channel DAC CS4362 (item 7200, 48-pin LQFP) for the audio output. This DAC accepts both DSD and PCM data streams.

There is a control line from the STi55xx, called CENTRE_ON, which is used to switch between the centre channel and front channels for both SACD- and DVD modes.