Philips DVDR730/0x, Руководство по обслуживанию

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Circuit-, IC descriptions and list of abbreviations EN 133 DVDR730/0x 9.
9.5.8 Reset
Reset concept Chrysalis board
Figure 9-7
The voltage detector NCP303LSN29 (IC7600) provides the
reset signal PNX7100_RESETn (active 'low') with the correct
timing behavior. This circuitry functions as a Power-On Reset
(POR) module, which detects the minimum functional voltage
that is needed by the device. It also detects any voltage drop.
When the power voltage is outside the nominal range, a reset
signal is generated by the POR module and fed to the reset
module which controls the individual reset of the different
peripherals and processing units.
There are two control lines which can overrule this reset signal:
•
IRESET_DIG (controlled by the microprocessor on the
Analogue Board).
• EJTAG_RESETn (only for production).
They can pull the output of the NCP303LSN29 (item 7106)
down via a shottky diode.
So when the output signal PNX7100_RESETn is 'low', the
board will reset. When this signal is 'high', the board is up and
running.
The PNX7100_SYS_RESETn is a general enabling signal for
the different reset lines. All other reset lines are directly driven
from Chrysalis port pins (e.g. MPIO13_IDE1_RESETn). All
reset lines are logically connected via 74LVC08D (item 7104)
and (item 7107) AND-gates. If both reset signals are low, all
other external devices are initialised.
9.5.9 I2C Bus
The PNX7100 is the master of the I2C bus (during reset,
external I2C masters are allowed). The following ICs are
controlled by the I2C bus:
•
IC7809.
• IC7810 NVRAMs.
• IC7004 VIP.
• IC7700 FLI2301 Video De-interlacer Line Doubler (for
Chrysalis-F boards).
• IC7703 ADV7196 Video Enc (for progressive scan done by
Chrysalis).
9.5.10 I/O Connectors
AIO Connector (item 1900)
The Audio In/Out (AIO) connector is used to interchange digital
audio signals between Analog- and Digital Board.
DAIO Connector (item 1901)
The Digital Audio In/Out (DAIO) connector is used to
interchange digital audio (SPDIF) signals between the IOE-
Board and the Digital Board.
VIO Connector (item 1904)
The Video In/Out (VIO) connector is used to interchange
analogue video signals between Analog- and Digital-Board.
9.5.11 Progressive Scan
Introduction
There are two versions foreseen, to generate a progressive
scan analogue video output:
•
In the standard Chrysalis board, the 'low end' progressive
video output is generated by the PNX7100.
• In the Chrysalis 'F', the 'high end' progressive output is
generated by the Faroudja FLI2301. This IC offers
additionaly DCDi, upscaling to HDTV, and picture
enhancement.
Description
The progressive scan part is integrated in the Digital Board and
built around the FLI2301 de-interlace/line doubler (7701). This
I2C controlled de-interlace uses a 64Mbit SDRAM (32bit x 2M)
to perform high quality de-interlacing (meshing). The de-
interlace gets its digital YUV input data from the PNX7100
(7400). The format of the digital YUV input to the Fli2301 is
CCIR656 with separated Hsync, Vsync, and odd/even signal
running on 27MHz.
CHRYSALIS
PNX7100
7400
GPIO
7104-3
&
Reset_IDEn
PNX7100_Resetn
PNX7100_SYS_Resetn
7106
3V3
>1
EJT
A
G_Resetn
IResetDig
NCP303
7104-4
&
Reset_1394n
7107-1
&
Reset_BEn
7107-2
&
Reset_PSn
7107-3
&
Analog_Resetn
7104-1
&
VIP_Resetn
3V3
CL 36532004_005.eps
140203