PNX17XX Datasheet, PDF (83/832 Pages) NXP Semiconductors – Connected Media Processor

Philips Semiconductors
Volume 1 of 1
PNX17xx Series
Chapter 2: Overview
Processing functions are those that modify an existing data structure and prepare
that structure for display functions.
Display functions take the processed data structures from memory and generate the
appropriate output stream. As in the case of the decode functions, display functions
can be relatively simple, such as an I²S audio output, or very complex, as in the case
of multi-surface composited display.
All decoded data structures are stored in memory, even when further processing is
not required. This mechanism implies that there is no direct path between input and
output data streams. The memory serves as the buffer to de-couple input and output
data streams. Based on the mode of operation, there may be multiple data structures
in memory for a given input stream. The PNX17xx Series uses the TM5250 CPU and
a timestamping mechanism to determine when a specific memory data structure is to
be displayed.
The PNX17xx Series implements the required decode, processing, and display
functions with a combination of fixed function hardware and TM5250 CPU software
modules. The PNX17xx Series provides a good balance between those functions that
are implemented in fixed hardware and those that are programmed to run on the
TM5250 CPU. The following tables illustrate how the major tasks are implemented
under each of the three main functional areas, and how they map to hardware
resources or software.
Table 1: Partitioning of Functions to Resources
function
Resource
description
video decoding/acquisition
digital video acquisition
VIP
includes optional horizontal down scaling or color space
conversion, and conversion to a variety of memory pixel formats
MPEG-1/2/4 video decoding
software
DVD authentication & de-scrambling DVD-CSS
authentication & de-scrambling in hardware
audio decoding and improvement processing
audio decoding AC3, AAC, MPEG software
L1, L2, MP3, others
decoders for almost any audio format available
audio processing
software
improvement processing and mixing
graphics
2D graphics rendering and DMA 2D DE
non-motion compensated de-
interlacing
MBS
median, 2-field majority select, 3-field majority select with or without
EDDI post pass for edge improvement
motion compensated de-interlacing MBS + software software provides the MBS with a motion compensated field, to
which the MBS applies the chosen de-interlacing algorithm
motion estimation
software
pixel accurate and quarter pixel accurate versions available
temporal up conversion
software
creates images temporally between two originals using motion
vectors
luminance histogram measurement MBS
luminance histogram collection during a de-interlace or scaling
pass
PNX17XX_SER_1
Preliminary data sheet
Rev. 1 — 17 March 2006
© Koninklijke Philips Electronics N.V. 2006. All rights reserved.
2-2