PNX1500E NXP Semiconductors, PNX1500E Datasheet - Page 97

• Manufacturer Part Number: PNX1500E
• Manufacturer: NXP Semiconductors

Specifications of PNX1500E

• Lead Free Status / Rohs Status: Not Compliant

NXP Semiconductors
Volume 1 of 1
8. Audio processing and Input/Output
PNX15XX_PNX952X_SER_N_4
Product data sheet
8.1 Audio Processing
8.2 Audio Inputs and Outputs
Motion vectors computed by TM3260 software can be sent to a video improvement
post-processor over the PCI interface.
The function of VDO_AUX is programmed using the QVCP capability to combine
alpha or chroma-keying information during blending. For example, chroma keys in a
graphics plane could be used to drive VDO_AUX. For another example, a threshold
value for an alpha value of a graphics plane could be used to indicate whether a pixel
is more than 80% video.
All audio processing in PNX15xx/952x Series is performed in software on the
TM3260. This includes decoding of audio from compressed formats, sample rate
conversion, mixing and special effects processing. There is sufficient performance, if
required, to transcode received audio to multi-channel compressed audio sent over
S/PDIF to an attached receiver.
The PNX15xx/952x Series has several Audio Input/Output facilities:
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PNX15xx/952x Series Audio In can capture up to 8 stereo audio inputs with up to
32-bit/sample precision at sample rates up to 96 kHz. Both Audio In and Audio
Out support most A/D converter serial protocols, including I
internally or externally generated. The internal generator is programmable with
sub one Hertz sampling rate accuracy. Audio In also includes a raw mode which
allows the capture of any quantity of bits out of the programmable frame (up to
512 bits per frame). The word strobe (AI_WS pin) is also captured and stored into
memory.
PNX15xx/952x Series Audio Out can generate up to 8 channels of audio, and
directly drives up to 4 external stereo I
to 32-bit/sample precision at sample rates up to 96 kHz. The sample rate can be
internally or externally generated. The internal generator is programmable with
sub one Hertz sampling rate accuracy. Audio out does not include a raw mode as
the Audio In module does.
PNX15xx/952x Series supports a SPDIF (Sony Philips Digital Interface) output
with IEC-1937 capabilities. Transmitted data is generated by TM3260 software.
This output port can carry either stereo PCM samples from an internal audio mix,
or one of the originally received compressed audio programs (5.1 channel AC-3,
multi-channel MPEG audio, multi-channel AAC). Sample rate of transmitted
audio is set by software, allowing perfect synchronization to any time reference in
the system.
PNX15xx/952x Series supports a SPDIF input to connect to external sources,
such as a DVD player. The incoming data is timestamped and written to unified
system memory. Data interpretation and sample rate recovery is achieved by
software on the TM3260. The audio data received can be in a variety of formats,
such as stereo PCM data, 5.1 channel AC-3 data per IEC-1937 or other.
Rev. 4.0 — 03 December 2007
2
S or similar D/A converters. It supports up
PNX15xx/952x Series
Chapter 2: Overview
2
S. Sample rate is
© NXP B.V. 2007. All rights reserved.
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