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EN 124
9.
DVDR615, MRV640
AV3 Basic Engine (VAE8030)
To be prepared for new developments, the Chrysalis Digital
Board is equipped with two IDE busses (ATAPI). They can be
9.5.5
Clock Distribution
Clock distribution on Chrysalis board
24.576 MHz
7004
VIP7118
7703
ADV7196
7201
1394 LINK
7200
1394 PHY
24.576 MHz
The PNX7100 has a complex clock system, which is needed to
support the processes running at different frequencies such as
video decoding, audio decoding or peripheral I/O devices etc.
To ensure a synchronous initialisation of all the registers and
state machines, all the PLLs are switched to their default
frequency and the reset sequence is run at 4 MHz. Then when
the booting control unit is correctly initialized and once it has
captured all the booting parameters, it sets the PLLs to its
functional frequency to allow the modules to run at their
nominal frequencies. Thanks to a clock blocking mechanism,
the frequency switching is glitch free.
System clocks:
•
PNX7100 (IC7400, pins AF9 and AF10) : 4 MHz provided
by the xtal oscillator 7402.
•
SAA7118 (IC7004, pins A3 and B4): 24.576 MHz provided
by xtal 1001.
•
ADV7196 (IC7703, pin 25): 27 MHz provided by PNX7100.
•
SDRAM (IC7804 and 7808, pin 38): 133 MHz provided by
the PNX7100.
•
1394-LINK (IC7201, pin 88): 49.152 MHz provided by
1394-PHY.
•
1394-PHY (IC7200, pins 59 and 60): 24.576 MHz provided
by xtal 1201.
Circuit-, IC descriptions and list of abbreviations
7400
7300
AUDIO PLL
used for connecting to the new generation Basic Engine (e.g.
the AV3), a Hard Disc Drive (HDD), or a Smart Card Reader.
BE INTERFACE
CHRYSALIS
PNX7100
27 MHz
4 MHz
Osc.
OPTIONAL
Figure 9-6
9.5.6
Power Supply
The Digital Board is not powered in standby mode. The control
signal 'ION' (Inverse On), coming from the analogue board, will
enable the PSU, and power the digital board.
•
ION = High: the digital board is in powered down standby
mode.
•
ION = Low: the power supply to the digital board is
enabled.
The 3V3, +5V, -5V, and +12V come from the PSU, while the
1V8 core voltage is generated on the board by a low voltage
buck controller (item 7501). It provides the control for a DC-DC
power solution producing an 1.8V output voltage over a wide
current range. The NCP1570-based solution is powered from
12 V with the output derived from the 3V3 supply. It contains all
required circuitry for a synchronous NFET (IC7500-1 and -2)
buck regulator.
9.5.7
Memory
Several memories are used on the Chrysalis Digital Board:
•
EEPROM IC7810: this memory contains all the necessary
boot parameters of the board.
•
EEPROM IC7809: this memory contains all the necessary
parameters for the application.
7804
133MHz
SDRAM
7812
SDRAM
CL 36532004_004.eps
140203
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