PNX1500E NXP Semiconductors, PNX1500E Datasheet - Page 508

• Manufacturer Part Number: PNX1500E
• Manufacturer: NXP Semiconductors

Specifications of PNX1500E

• Lead Free Status / Rohs Status: Not Compliant

1. Introduction
2. Functional Description
1.1 Features
The Audio Output module provides a DMA-driven serial interface designed to support
stereo audio D/A converters. The Audio Out module can support up to eight PCM
audio channels by driving up to four external stereo D/A converters. The Audio Out
unit provides a glueless interface to high quality, low cost oversampling D/A
converters. A precise programmable oversampling clock is featured.
The Audio Out unit, along with the associated external D/A converters, provides the
following capabilities:
Remark: AC-97 codecs are not supported.
The Audio Out module has four major subsystems: a programmable sample clock
generator, a DMA engine, a parallel to serial converter and memory mapped registers
for configuration and control. The Audio Out connectors provide the digital audio
stream, clock and control signals to external D/A converters. A block diagram of
Audio Out is illustrated in
The DMA engine reads 16 or 32-bit samples from memory using dual DMA buffers in
memory. Software initially assigns two full sample buffers in memory containing an
integral number of samples for all active channels. The DMA engine retrieves
samples from the first buffer in memory until exhausted and continues from the
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Chapter 15: Audio Output
PNX15xx/952x Series Data Book – Volume 1 of 1
Rev. 4.0 — 03 December 2007
Up to 8 channels of audio output
16-bit or 32-bit samples per channel
Programmable 1 Hz to 100 kHz sampling rate
(Note: This is a practical range. The actual sample rate is application dependent.)
Internal or external bit clock source
Autonomously retrieves processed audio data from dual DMA buffers in memory
16-bit mono and stereo PC standard memory data formats
Control capability for highly integrated PC codecs
Figure
1.
Product data sheet