PNX1500E NXP Semiconductors, PNX1500E Datasheet - Page 548
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PNX1500E
Manufacturer Part Number
PNX1500E
Description
Manufacturer
NXP Semiconductors
Datasheet
1.PNX1500E.pdf
(828 pages)
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Volume 1 of 1
PNX15XX_PNX952X_SER_N_4
Product data sheet
3.2 Register Programming Guidelines
Before enabling the SPDO block, software must assign two buffers with data to
SPDO_BASE1, SPDO_BASE2 and a buffer size value (in bytes) to SPDO_SIZE.
Each memory buffer size must be a multiple of 64 bytes, regardless of the operating
mode.
The SPDO block is enabled by writing a ‘1’ to SPDO_CTL.TRANS_ENABLE. Once
enabled, the first DMA buffer is sent out at the programmed sample rate. Once the
first buffer is empty, BUF1_ACTIVE is negated and the BUF1_EMPTY flag in
SPDO_STATUS is asserted. If BUF1_INTEN in SPDO_CTL is asserted, an interrupt
to the chip level interrupt controller is generated.
The SPDO block continues by emitting the data in DMA buffer2. In normal operation,
software assigns a new buffer 1 full of data to SPDO and signals this by writing a ‘1’ to
ACK_BUF1. The SPDO block immediately negates the BUF1_EMPTY condition and
the related interrupt request. Once buffer2 is empty, similar signalling occurs and the
hardware switches back using buffer1. Transmission continues interrupted until the
unit is disabled.
The SPDO module has two operating modes: SPDIF and transparent DMA mode.
IEC Mode
SPDIF driver software assembles SPDIF data in each memory data buffer. Each
memory data buffer consists of groups of 32 bit words in memory. Each word
describes the data to be transmitted for a single IEC-60958 sub-frame, including what
type of preamble to include. Each sub-frame is transmitted in 64 clock intervals of the
SPDO clock.
The SPDIF mode is also useful for providing a source input stream for an available
SPDIF IN block.
Transparent DMA Mode
In transparent DMA mode, software prepares each data bit exactly as it is to be
transmitted, in a series of 32 bit words in each memory data buffer. The 32 bit word is
constructed according to the byte ordering rules of little or big-endian mode. Each 32-
bit word is transmitted (LSB or MSB first) into 32 clock intervals of the DDS. The data
is shifted out “as is,” without bi-phase mark encoding, parity generation or preamble
insertion.
Rev. 4.0 — 03 December 2007
PNX15xx/952x Series
Chapter 17: SPDIF Output
© NXP B.V. 2007. All rights reserved.
17-548
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