PNX1501E NXP Semiconductors, PNX1501E Datasheet - Page 543
PNX1501E
Manufacturer Part Number
PNX1501E
Description
Digital Signal Processors & Controllers (DSP, DSC) MEDIA PROCESSOR PNX15XX/266MHZ
Manufacturer
NXP Semiconductors
Datasheet
1.PNX1501E.pdf
(819 pages)
Specifications of PNX1501E
Product
DSPs
Maximum Operating Temperature
+ 85 C
Mounting Style
SMD/SMT
Package / Case
SOT-795
Minimum Operating Temperature
0 C
Lead Free Status / Rohs Status
Details
Other names
PNX1501E,557
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Product data sheet
Programmers should refer to the IEC-60958 Digital Audio Interface, “Part 1:General;
Part 2: Professional Applications; Part 3: Consumer Applications” for a precise
description of the required values in each field for different types of consumer
equipment.
The SPDO block hardware only generates B, W and M preambles as well as the P
(Parity) bit. All other bits in the sub-frame are completely determined by software and
copied “as is” from memory to output, subject only to bit-cell coding.
Software must construct valid IEC-60958 blocks by using the right sequence of 32-bit
words as described in
IEC-60958 Bit Cell and Preamble
Each data bit in IEC-60958 is transmitted using bi-phase mark encoding. In bi-phase
mark encoding, each data bit is transmitted as a cell consisting of two consecutive
binary states. The first state of a cell is always inverted from the second state of the
previous cell. The second state of a cell is identical to the first state if the data bit
value is a “0”, and inverted if the data bit value is a “1”.
Preambles are coded as bi-phase mark violations, where the first state of a cell is not
the inverse of the last state of the previous cell.
The duration of each state in a cell is called a UI (Unit Interval), so that each cell is 2
UIs long. In SPDO, the length of a UI is 1 SPDO clock cycle as determined by the
settings of the DDS (see
Figure 2
the transmission format of the three preambles. Note that each preamble always
starts with a rising edge. This is made possible by the presence of the parity bit,
which always guarantees an even number of ‘1’ bits in each subframe.
Figure 2:
illustrates the transmission format of 8 bit data value “10011000”, as well as
Bi-Phase Mark Data Transmission
Bi-Phase Mark
Rev. 2 — 1 December 2004
W Preamble
M Preamble
B Preamble
Section IEC-60958 Memory Data Format
NRZ
Section 3.1.1 Sample Rate
“1”
“0”
“0”
“1”
© Koninklijke Philips Electronics N.V. 2002-2003-2004. All rights reserved.
UI
cell
“1”
bi-phase mark violation
bi-phase mark violation
bi-phase mark violation
Programming).
“0”
Chapter 17: SPDIF Output
PNX15xx Series
“0”
“0”
17-5
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