PNX1502E/G,557 NXP Semiconductors, PNX1502E/G,557 Datasheet - Page 804
PNX1502E/G,557
Manufacturer Part Number
PNX1502E/G,557
Description
IC MEDIA PROC 300MHZ 456-BGA
Manufacturer
NXP Semiconductors
Specifications of PNX1502E/G,557
Applications
Multimedia
Core Processor
TriMedia
Controller Series
Nexperia
Interface
I²C, 2-Wire Serial
Number Of I /o
61
Voltage - Supply
1.23 V ~ 1.37 V
Operating Temperature
0°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
456-BGA
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Program Memory Type
-
Ram Size
-
Lead Free Status / Rohs Status
Compliant
Other names
568-1298
935277748557
PNX1502E/G
935277748557
PNX1502E/G
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Philips Semiconductors
Volume 1 of 1
3. Endian Mode Theory
PNX15XX_SER_3
Product data sheet
3.1 Law 1: The “CPU Rule”
There are two basic laws of endian mode: one imposed by CPU history, and one by
convention. Both must be met by any system architecture that implements dual-
endian operation capability. In addition, there are some implementation choices for a
system architecture.
Series on-chip buses. These choices are somewhat arbitrary, but they must be
followed to ensure future compatibility.
This section is intended to explain CPU endian modes in detail. For those familiar
with CPUs and endian modes, it is optional reading.
The following summarizes how CPUs and byte-addressable memory operate:
Consider the following example a (hypothetical) C struct:
} DMA_Descriptor;
Remark: This is based on an example in the Apple
Cards and Drivers for Power Macintosh Computers,” Appendix A.
A compiler would assign byte offsets as follows: C:0, F:1, L:2, A:4. This assignment is
independent of system endian mode.
Figure 2
Figure 2:
•
•
•
When storing an “n byte” size item from a CPU register to memory at address “A,”
the bytes modified are always the bytes with byte address “A”..”A+n-1.”
In little-endian mode, the byte at address “A” receives the least significant bits of
the multi-byte item.
In big-endian mode, the byte at address “A” receives the most significant bits.
struct {
UInt8C;//"command" byte
UInt8F;//"flags" byte
UInt16L;//"length" 16 bit value
UInt32A;//"address" 32 bit value
and
0
Big-Endian Layout of DMA_Descriptor
C
Figure 3
1
Rev. 3 — 17 March 2006
Section 6.
F
show the two layout views.
Word 1
2
explains the choices that were made for the PNX15xx
L
4
Word 2
© Koninklijke Philips Electronics N.V. 2006. All rights reserved.
publication, ”Designing PCI
PNX15xx Series
Chapter 29: Endian Mode
A
29-4
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