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Bexperia

PNX7850 Datasheet Preview

PNX7850 Datasheet

High Speed CD-RAM Processor

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Nexperia PNX7850
High-speed DVD+R/RW and CD-R/RW
processor for PC-hosted recorders
The Philips Nexperia PNX7850 is a highly integrated,
multi-functional processor for high-speed DVD/CD
recorders. As part of the Philips DVD+RW chipset, the
PNX7850 brings industry-leading speed and accuracy to
computing applications.
Semiconductors
Key features
> Delivers industry-leading performance as part of the Philips
DVD+RW chipset:
- Writes 8x DVD+R, 4x DVD+RW, 32x CD-R, and 12x CD-RW
- Reads 16x DVD-ROM, DVD+R, DVD+RW, DVD-R, DVD-RW;
and 48x CD-ROM, CD-DA, CD-R, CD-RW
> Integrated functions for lower cost, higher performance
- Channel and data-block codecs
- Buffer manager with ATAPI host interface
- Audio processor for digital audio data
- 32-bit MIPS processor with embedded memory
- Servo DSP with acceleration modules
- Analog front-end
> Power management features for portable applications
> 240-pin PGBA package
> Complete reference design with modular software available
The Nexperia PNX7850 processor handles all of the encoding and
decoding functions required for industry-leading write and read
performance in DVD/CD recorders. In addition to a 32-bit MIPS
RISC core, it integrates channel and data-block codecs, a servo DSP,
a buffer manager, and an audio processor. On its own, the PNX7850
can support write speeds of 8x DVD and 48x CD (early versions
support 4x DVD), and read speeds of 16x DVD and 56x CD. When
configured with the Philips DVD+RW chipset, the PNX7850 con-
tributes to write performance of 8x DVD+R, 4x DVD+RW, 32x
CD-R, and 12x CD-RW, and read performance of 16x DVD-ROM
and 48x CD. Exceptional write speeds are due in part to a tech-
nology, developed in partnership with Intersil, that moves the write-
strategy function off-chip onto the optical pickup unit (OPU).
Designed in accordance with the DVD+RW standard, the PNX7850
is compatible with other DVD and CD formats, including DVD-R/
RW and DVD-ROM, as well as CD-ROM and CD-DA. It is manu-
factured using an advanced 0.18-┬Ám CMOS process that reduces
core voltage and power consumption. For portable applications, the
PNX7850 offers clock gating and enhanced power-down features.
Target applications
The PNX7850 is designed for use in desktop, notebook, and laptop
PCs that integrate a DVD recorder. It can also be used in desktop
or portable PC peripherals.Wide interoperability with other stan-
dards makes it especially suited to double-writer and combination
applications.
Functional overview
The PNX7850 is a highly integrated device that includes channel
and data-block codecs, a buffer manager, an audio processor, a
32-bit MIPS processor, and a servo DSP.




Bexperia

PNX7850 Datasheet Preview

PNX7850 Datasheet

High Speed CD-RAM Processor

No Preview Available !

www.DataSheet4U.com
Nexperia PNX7850
High-speed DVD+R/RW and CD-R/RW processor for PC/hosted recorders
Semiconductors
Channel and block codecs
The PNX7850 includes a DVD/CD channel encoder/decoder and a
block encoder/decoder. In encode mode, the codecs generate the
write signal. In decode mode, they perform signal conditioning,
demodulation, and error correction of the EFM stream. Telemetry
and error correction statistics are accessible to the processor via
registers and are output directly on a dedicated serial debug channel.
Buffer manager
The buffer manager includes a memory processor, hardware
automation, an SDRAM controller, a UDMA66 ATAPI host inter-
face, plus interfaces to the codecs and microprocessor blocks. In
encode mode, data from the host PC is temporarily stored in
external SDRAM before being fed to the data block codec. In
decode mode, data from the data block codec is stored in exter-
nal SDRAM, so it can be provided to the host PC on request.
Digital audio data is handled separately, passing through an inter-
nal audio processor before reaching the PC.
Nexperia PNX7850 conceptual block diagram
EFM
SDRAM
wobble
HF
motor
ANALOG CHANNEL CODEC
CD/DVD
WOBBLE
PROCESSOR
SIGNAL
CONDITION.
EFM WRITE
CLOCK/DATA
GENERATOR
BIT
DETECTION
AND
DEMOD.
CD/DVD
CHANNEL
ENCODE/
DECODE
WITH
ERROR
CORRECTION
DATA BLOCK
ENCODE/
DECODE
TACHO/MOTOR
CONTROL
TELEMETRY
MICRO
INTERFACE
BUFFER
MANAGER
SDRAM
CONTROLLER
MEMORY
PROCESSOR
AUTOMATION
MICRO
INTERFACE
UDMA66
HOST
INTERFACE
AUDIO
PROCESSOR
actuators
LF input
OPC input
SERVO DSP AND CONTROL PROCESSOR
SERVO
ACCELERATORS
OPC
SERVO
DSP
PI-bus
MIPS PR1910
INTERFACE
INSTRUCTION
EXECUTION
UNIT
POWER
MANAGEMENT
CACHE
DEBUG SUPPORT
COPROCESSOR DEEPLY EMBEDDED
MEMORY
INTERRUPT
CONTROLLER
ROM
EJTAG
CSS
STATIC MEMORY
INTERFACE
UART
CONFIG
GPIO
I2C
POWER CONTROL
AND RESET
host
audio
UART
GPIO
I2C
Flash


Part Number PNX7850
Description High Speed CD-RAM Processor
Maker Bexperia
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