PNX1501E NXP Semiconductors, PNX1501E Datasheet - Page 794
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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1. Introduction
1.1 Features
Two addressing conventions exist in the computer industry: little-endian and
big-endian.
The PNX15xx Series supports both big-endian mode and little-endian mode, allowing
it to run either little-endian or big-endian software, as required by the particular
application.
This chapter explains the concepts and programmer’s view of data structures
required for module control and module DMA. The chapter also contains a section
that shows how hardware modules, buses and bridges implement the programmer’s
view.
•
•
•
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•
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Chapter 29: Endian Mode
PNX15xx Series Data Book – Volume 1 of 1
Rev. 2 — 1 December 2004
In the little-endian convention, a multi-byte number is stored in memory with the
least significant byte at the lowest memory address, and subsequent bytes at
increasing addresses.
In the big-endian convention, the most significant byte is stored at the lowest
memory address, and subsequent bytes are stored at increasing addresses.
The PNX15xx Series supports big-endian and little-endian operation.
The system as a whole (all CPUs and all on-chip DMA modules) must operate in
the same endian mode.
When used with an external CPU, the PNX15xx Series must operate in the same
endian mode as the external CPU. If the endian modes between the external
CPU and the PNX15xx Series are different, then the external CPU must be
aware of this difference and appropriately handle all data swapping.
The endian-mode choice is made at boot time. It can be changed by software, but
this requires a partial system reset.
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